mirror of https://github.com/go-gorm/gorm.git
459 lines
14 KiB
Go
459 lines
14 KiB
Go
package schema
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import (
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"fmt"
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"reflect"
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"regexp"
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"strings"
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"github.com/jinzhu/inflection"
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"gorm.io/gorm/clause"
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)
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// RelationshipType relationship type
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type RelationshipType string
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const (
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HasOne RelationshipType = "has_one" // HasOneRel has one relationship
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HasMany RelationshipType = "has_many" // HasManyRel has many relationship
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BelongsTo RelationshipType = "belongs_to" // BelongsToRel belongs to relationship
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Many2Many RelationshipType = "many_to_many" // Many2ManyRel many to many relationship
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)
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type Relationships struct {
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HasOne []*Relationship
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BelongsTo []*Relationship
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HasMany []*Relationship
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Many2Many []*Relationship
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Relations map[string]*Relationship
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}
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type Relationship struct {
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Name string
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Type RelationshipType
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Field *Field
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Polymorphic *Polymorphic
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References []*Reference
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Schema *Schema
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FieldSchema *Schema
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JoinTable *Schema
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foreignKeys, primaryKeys []string
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}
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type Polymorphic struct {
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PolymorphicID *Field
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PolymorphicType *Field
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Value string
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}
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type Reference struct {
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PrimaryKey *Field
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PrimaryValue string
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ForeignKey *Field
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OwnPrimaryKey bool
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}
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func (schema *Schema) parseRelation(field *Field) {
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var (
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err error
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fieldValue = reflect.New(field.IndirectFieldType).Interface()
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relation = &Relationship{
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Name: field.Name,
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Field: field,
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Schema: schema,
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foreignKeys: toColumns(field.TagSettings["FOREIGNKEY"]),
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primaryKeys: toColumns(field.TagSettings["REFERENCES"]),
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}
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)
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if relation.FieldSchema, err = Parse(fieldValue, schema.cacheStore, schema.namer); err != nil {
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schema.err = err
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return
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}
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if polymorphic, _ := field.TagSettings["POLYMORPHIC"]; polymorphic != "" {
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schema.buildPolymorphicRelation(relation, field, polymorphic)
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} else if many2many, _ := field.TagSettings["MANY2MANY"]; many2many != "" {
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schema.buildMany2ManyRelation(relation, field, many2many)
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} else {
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switch field.IndirectFieldType.Kind() {
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case reflect.Struct, reflect.Slice:
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schema.guessRelation(relation, field, true)
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default:
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schema.err = fmt.Errorf("unsupported data type %v for %v on field %v", relation.FieldSchema, schema, field.Name)
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}
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}
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if relation.Type == "has" {
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if relation.FieldSchema != relation.Schema && relation.Polymorphic == nil {
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relation.FieldSchema.Relationships.Relations["_"+relation.Schema.Name+"_"+relation.Name] = relation
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}
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switch field.IndirectFieldType.Kind() {
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case reflect.Struct:
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relation.Type = HasOne
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case reflect.Slice:
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relation.Type = HasMany
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}
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}
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if schema.err == nil {
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schema.Relationships.Relations[relation.Name] = relation
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switch relation.Type {
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case HasOne:
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schema.Relationships.HasOne = append(schema.Relationships.HasOne, relation)
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case HasMany:
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schema.Relationships.HasMany = append(schema.Relationships.HasMany, relation)
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case BelongsTo:
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schema.Relationships.BelongsTo = append(schema.Relationships.BelongsTo, relation)
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case Many2Many:
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schema.Relationships.Many2Many = append(schema.Relationships.Many2Many, relation)
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}
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}
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}
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// User has many Toys, its `Polymorphic` is `Owner`, Pet has one Toy, its `Polymorphic` is `Owner`
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// type User struct {
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// Toys []Toy `gorm:"polymorphic:Owner;"`
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// }
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// type Pet struct {
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// Toy Toy `gorm:"polymorphic:Owner;"`
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// }
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// type Toy struct {
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// OwnerID int
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// OwnerType string
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// }
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func (schema *Schema) buildPolymorphicRelation(relation *Relationship, field *Field, polymorphic string) {
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relation.Polymorphic = &Polymorphic{
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Value: schema.Table,
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PolymorphicType: relation.FieldSchema.FieldsByName[polymorphic+"Type"],
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PolymorphicID: relation.FieldSchema.FieldsByName[polymorphic+"ID"],
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}
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if value, ok := field.TagSettings["POLYMORPHIC_VALUE"]; ok {
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relation.Polymorphic.Value = strings.TrimSpace(value)
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}
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if relation.Polymorphic.PolymorphicType == nil {
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schema.err = fmt.Errorf("invalid polymorphic type %v for %v on field %v, missing field %v", relation.FieldSchema, schema, field.Name, polymorphic+"Type")
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}
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if relation.Polymorphic.PolymorphicID == nil {
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schema.err = fmt.Errorf("invalid polymorphic type %v for %v on field %v, missing field %v", relation.FieldSchema, schema, field.Name, polymorphic+"ID")
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}
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if schema.err == nil {
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relation.References = append(relation.References, &Reference{
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PrimaryValue: relation.Polymorphic.Value,
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ForeignKey: relation.Polymorphic.PolymorphicType,
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})
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primaryKeyField := schema.PrioritizedPrimaryField
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if len(relation.foreignKeys) > 0 {
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if primaryKeyField = schema.LookUpField(relation.foreignKeys[0]); primaryKeyField == nil || len(relation.foreignKeys) > 1 {
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schema.err = fmt.Errorf("invalid polymorphic foreign keys %+v for %v on field %v", relation.foreignKeys, schema, field.Name)
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}
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}
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// use same data type for foreign keys
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relation.Polymorphic.PolymorphicID.DataType = primaryKeyField.DataType
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relation.References = append(relation.References, &Reference{
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PrimaryKey: primaryKeyField,
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ForeignKey: relation.Polymorphic.PolymorphicID,
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OwnPrimaryKey: true,
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})
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}
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relation.Type = "has"
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}
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func (schema *Schema) buildMany2ManyRelation(relation *Relationship, field *Field, many2many string) {
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relation.Type = Many2Many
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var (
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err error
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joinTableFields []reflect.StructField
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fieldsMap = map[string]*Field{}
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ownFieldsMap = map[string]bool{} // fix self join many2many
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joinForeignKeys = toColumns(field.TagSettings["JOINFOREIGNKEY"])
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joinReferences = toColumns(field.TagSettings["JOINREFERENCES"])
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)
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ownForeignFields := schema.PrimaryFields
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refForeignFields := relation.FieldSchema.PrimaryFields
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if len(relation.foreignKeys) > 0 {
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ownForeignFields = []*Field{}
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for _, foreignKey := range relation.foreignKeys {
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if field := schema.LookUpField(foreignKey); field != nil {
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ownForeignFields = append(ownForeignFields, field)
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} else {
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schema.err = fmt.Errorf("invalid foreign key: %v", foreignKey)
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return
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}
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}
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}
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if len(relation.primaryKeys) > 0 {
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refForeignFields = []*Field{}
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for _, foreignKey := range relation.primaryKeys {
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if field := relation.FieldSchema.LookUpField(foreignKey); field != nil {
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refForeignFields = append(refForeignFields, field)
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} else {
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schema.err = fmt.Errorf("invalid foreign key: %v", foreignKey)
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return
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}
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}
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}
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for idx, ownField := range ownForeignFields {
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joinFieldName := schema.Name + ownField.Name
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if len(joinForeignKeys) > idx {
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joinFieldName = joinForeignKeys[idx]
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}
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ownFieldsMap[joinFieldName] = true
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fieldsMap[joinFieldName] = ownField
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joinTableFields = append(joinTableFields, reflect.StructField{
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Name: joinFieldName,
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PkgPath: ownField.StructField.PkgPath,
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Type: ownField.StructField.Type,
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Tag: removeSettingFromTag(ownField.StructField.Tag, "column"),
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})
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}
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for idx, relField := range refForeignFields {
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joinFieldName := relation.FieldSchema.Name + relField.Name
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if len(joinReferences) > idx {
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joinFieldName = joinReferences[idx]
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}
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if _, ok := ownFieldsMap[joinFieldName]; ok {
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if field.Name != relation.FieldSchema.Name {
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joinFieldName = inflection.Singular(field.Name) + relField.Name
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} else {
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joinFieldName += "Reference"
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}
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}
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fieldsMap[joinFieldName] = relField
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joinTableFields = append(joinTableFields, reflect.StructField{
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Name: joinFieldName,
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PkgPath: relField.StructField.PkgPath,
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Type: relField.StructField.Type,
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Tag: removeSettingFromTag(relField.StructField.Tag, "column"),
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})
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}
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if relation.JoinTable, err = Parse(reflect.New(reflect.StructOf(joinTableFields)).Interface(), schema.cacheStore, schema.namer); err != nil {
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schema.err = err
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}
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relation.JoinTable.Name = many2many
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relation.JoinTable.Table = schema.namer.JoinTableName(many2many)
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// build references
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for _, f := range relation.JoinTable.Fields {
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// use same data type for foreign keys
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f.DataType = fieldsMap[f.Name].DataType
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relation.References = append(relation.References, &Reference{
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PrimaryKey: fieldsMap[f.Name],
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ForeignKey: f,
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OwnPrimaryKey: schema == fieldsMap[f.Name].Schema && ownFieldsMap[f.Name],
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})
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}
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return
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}
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func (schema *Schema) guessRelation(relation *Relationship, field *Field, guessHas bool) {
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var (
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primaryFields, foreignFields []*Field
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primarySchema, foreignSchema = schema, relation.FieldSchema
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)
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if !guessHas {
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primarySchema, foreignSchema = relation.FieldSchema, schema
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}
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reguessOrErr := func(err string, args ...interface{}) {
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if guessHas {
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schema.guessRelation(relation, field, false)
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} else {
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schema.err = fmt.Errorf(err, args...)
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}
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}
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if len(relation.foreignKeys) > 0 {
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for _, foreignKey := range relation.foreignKeys {
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if f := foreignSchema.LookUpField(foreignKey); f != nil {
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foreignFields = append(foreignFields, f)
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} else {
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reguessOrErr("unsupported relations %v for %v on field %v with foreign keys %v", relation.FieldSchema, schema, field.Name, relation.foreignKeys)
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return
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}
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}
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} else {
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for _, primaryField := range primarySchema.PrimaryFields {
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lookUpName := schema.Name + primaryField.Name
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if !guessHas {
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lookUpName = field.Name + primaryField.Name
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}
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if f := foreignSchema.LookUpField(lookUpName); f != nil {
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foreignFields = append(foreignFields, f)
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primaryFields = append(primaryFields, primaryField)
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}
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}
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}
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if len(foreignFields) == 0 {
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reguessOrErr("failed to guess %v's relations with %v's field %v 1 g %v", relation.FieldSchema, schema, field.Name, guessHas)
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return
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} else if len(relation.primaryKeys) > 0 {
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for idx, primaryKey := range relation.primaryKeys {
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if f := primarySchema.LookUpField(primaryKey); f != nil {
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if len(primaryFields) < idx+1 {
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primaryFields = append(primaryFields, f)
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} else if f != primaryFields[idx] {
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reguessOrErr("unsupported relations %v for %v on field %v with primary keys %v", relation.FieldSchema, schema, field.Name, relation.primaryKeys)
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return
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}
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} else {
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reguessOrErr("unsupported relations %v for %v on field %v with primary keys %v", relation.FieldSchema, schema, field.Name, relation.primaryKeys)
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return
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}
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}
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} else if len(primaryFields) == 0 {
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if len(foreignFields) == 1 {
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primaryFields = append(primaryFields, primarySchema.PrioritizedPrimaryField)
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} else if len(primarySchema.PrimaryFields) == len(foreignFields) {
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primaryFields = append(primaryFields, primarySchema.PrimaryFields...)
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} else {
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reguessOrErr("unsupported relations %v for %v on field %v", relation.FieldSchema, schema, field.Name)
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return
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}
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}
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// build references
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for idx, foreignField := range foreignFields {
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// use same data type for foreign keys
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foreignField.DataType = primaryFields[idx].DataType
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relation.References = append(relation.References, &Reference{
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PrimaryKey: primaryFields[idx],
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ForeignKey: foreignField,
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OwnPrimaryKey: schema == primarySchema && guessHas,
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})
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}
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if guessHas {
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relation.Type = "has"
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} else {
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relation.Type = BelongsTo
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}
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}
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type Constraint struct {
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Name string
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Field *Field
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Schema *Schema
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ForeignKeys []*Field
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ReferenceSchema *Schema
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References []*Field
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OnDelete string
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OnUpdate string
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}
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func (rel *Relationship) ParseConstraint() *Constraint {
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str := rel.Field.TagSettings["CONSTRAINT"]
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if str == "-" {
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return nil
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}
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var (
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name string
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idx = strings.Index(str, ",")
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settings = ParseTagSetting(str, ",")
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)
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if idx != -1 && regexp.MustCompile("^[A-Za-z-_]+$").MatchString(str[0:idx]) {
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name = str[0:idx]
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} else {
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name = rel.Schema.namer.RelationshipFKName(*rel)
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}
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constraint := Constraint{
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Name: name,
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Field: rel.Field,
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OnUpdate: settings["ONUPDATE"],
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OnDelete: settings["ONDELETE"],
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}
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for _, ref := range rel.References {
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if ref.PrimaryKey != nil {
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constraint.ForeignKeys = append(constraint.ForeignKeys, ref.ForeignKey)
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constraint.References = append(constraint.References, ref.PrimaryKey)
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if ref.OwnPrimaryKey {
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constraint.Schema = ref.ForeignKey.Schema
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constraint.ReferenceSchema = rel.Schema
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} else {
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constraint.Schema = rel.Schema
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constraint.ReferenceSchema = ref.PrimaryKey.Schema
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}
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}
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}
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if rel.JoinTable != nil {
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return nil
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}
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return &constraint
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}
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func (rel *Relationship) ToQueryConditions(reflectValue reflect.Value) (conds []clause.Expression) {
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foreignFields := []*Field{}
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relForeignKeys := []string{}
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if rel.JoinTable != nil {
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for _, ref := range rel.References {
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if ref.OwnPrimaryKey {
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foreignFields = append(foreignFields, ref.PrimaryKey)
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relForeignKeys = append(relForeignKeys, ref.ForeignKey.DBName)
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} else if ref.PrimaryValue != "" {
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conds = append(conds, clause.Eq{
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Column: clause.Column{Table: rel.JoinTable.Table, Name: ref.ForeignKey.DBName},
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Value: ref.PrimaryValue,
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})
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} else {
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conds = append(conds, clause.Eq{
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Column: clause.Column{Table: rel.JoinTable.Table, Name: ref.ForeignKey.DBName},
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Value: clause.Column{Table: rel.FieldSchema.Table, Name: ref.PrimaryKey.DBName},
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})
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}
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}
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} else {
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for _, ref := range rel.References {
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if ref.OwnPrimaryKey {
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relForeignKeys = append(relForeignKeys, ref.ForeignKey.DBName)
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foreignFields = append(foreignFields, ref.PrimaryKey)
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} else if ref.PrimaryValue != "" {
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conds = append(conds, clause.Eq{
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Column: clause.Column{Table: rel.FieldSchema.Table, Name: ref.ForeignKey.DBName},
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Value: ref.PrimaryValue,
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})
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} else {
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relForeignKeys = append(relForeignKeys, ref.PrimaryKey.DBName)
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foreignFields = append(foreignFields, ref.ForeignKey)
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}
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}
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}
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_, foreignValues := GetIdentityFieldValuesMap(reflectValue, foreignFields)
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column, values := ToQueryValues(relForeignKeys, foreignValues)
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conds = append(conds, clause.IN{Column: column, Values: values})
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return
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}
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