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Implement parse relationship architecture

This commit is contained in:
Jinzhu 2020-02-01 12:46:52 +08:00
parent 010dc7e6dd
commit eea78f3f30
7 changed files with 226 additions and 62 deletions
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26
clause/clause.go
View File

@ -59,7 +59,7 @@ type OverrideNameInterface interface {
type Where struct {
AndConditions AddConditions
ORConditions []ORConditions
Builders []Expression
builders []Expression
}
func (where Where) Name() string {
@ -74,8 +74,8 @@ func (where Where) Build(builder Builder) {
where.AndConditions.Build(builder)
}
if len(where.Builders) > 0 {
for _, b := range where.Builders {
if len(where.builders) > 0 {
for _, b := range where.builders {
if withConditions {
builder.Write(" AND ")
}
@ -122,9 +122,9 @@ func (where Where) MergeExpression(expr Expression) {
if w, ok := expr.(Where); ok {
where.AndConditions = append(where.AndConditions, w.AndConditions...)
where.ORConditions = append(where.ORConditions, w.ORConditions...)
where.Builders = append(where.Builders, w.Builders...)
where.builders = append(where.builders, w.builders...)
} else {
where.Builders = append(where.Builders, expr)
where.builders = append(where.builders, expr)
}
}
@ -135,6 +135,22 @@ type Select struct {
// Join join clause
type Join struct {
Table string
Type string // left join books on
ON []Expression
builders []Expression
}
func (join Join) Build(builder Builder) {
// TODO
}
func (join Join) MergeExpression(expr Expression) {
if j, ok := expr.(Join); ok {
join.builders = append(join.builders, j.builders...)
} else {
join.builders = append(join.builders, expr)
}
}
// GroupBy group by clause

6
clause/query.go
View File

@ -2,6 +2,12 @@ package clause
import "strings"
// Column quote with name
type Column struct {
Table string
Name string
}
////////////////////////////////////////////////////////////////////////////////
// Query Expressions
////////////////////////////////////////////////////////////////////////////////

20
schema/field.go
View File

@ -8,10 +8,10 @@ import (
"time"
)
type FieldType string
type DataType string
const (
Bool FieldType = "bool"
Bool DataType = "bool"
Int = "int"
Uint = "uint"
Float = "float"
@ -24,7 +24,7 @@ type Field struct {
Name string
DBName string
BindNames []string
DataType FieldType
DataType DataType
DBDataType string
PrimaryKey bool
AutoIncrement bool
@ -42,8 +42,7 @@ type Field struct {
Tag reflect.StructTag
TagSettings map[string]string
Schema *Schema
EmbeddedbSchema *Schema
Relationship string
EmbeddedSchema *Schema
}
func (schema *Schema) ParseField(fieldStruct reflect.StructField) *Field {
@ -177,8 +176,8 @@ func (schema *Schema) ParseField(fieldStruct reflect.StructField) *Field {
}
if _, ok := field.TagSettings["EMBEDDED"]; ok || fieldStruct.Anonymous {
field.EmbeddedbSchema = Parse(fieldValue, sync.Map{}, schema.namer)
for _, ef := range field.EmbeddedbSchema.Fields {
field.EmbeddedSchema, schema.err = Parse(fieldValue, sync.Map{}, schema.namer)
for _, ef := range field.EmbeddedSchema.Fields {
ef.BindNames = append([]string{fieldStruct.Name}, ef.BindNames...)
if prefix, ok := field.TagSettings["EMBEDDED_PREFIX"]; ok {
@ -189,13 +188,6 @@ func (schema *Schema) ParseField(fieldStruct reflect.StructField) *Field {
ef.TagSettings[k] = v
}
}
} else {
switch fieldValue.Kind() {
case reflect.Struct:
field.Relationship = "one"
case reflect.Slice:
field.Relationship = "many"
}
}
return field

16
schema/naming.go
View File

@ -10,8 +10,10 @@ import (
// Namer namer interface
type Namer interface {
TableName(string) string
ColumnName(string) string
TableName(table string) string
ColumnName(column string) string
JoinTableName(table string) string
JoinTableColumnName(table, column string) string
}
// NamingStrategy tables, columns naming strategy
@ -33,6 +35,16 @@ func (ns NamingStrategy) ColumnName(str string) string {
return toDBName(str)
}
// JoinTableName convert string to join table name
func (ns NamingStrategy) JoinTableName(str string) string {
return ns.TablePrefix + toDBName(str)
}
// JoinTableColumnName convert string to join table column name
func (ns NamingStrategy) JoinTableColumnName(referenceTable, referenceColumn string) string {
return inflection.Singular(toDBName(referenceTable)) + toDBName(referenceColumn)
}
var (
smap sync.Map
// https://github.com/golang/lint/blob/master/lint.go#L770

142
schema/relationship.go
View File

@ -1,43 +1,143 @@
package schema
import (
"fmt"
"reflect"
"strings"
)
// RelationshipType relationship type
type RelationshipType string
const (
HasOneRel RelationshipType = "has_one" // HasOneRel has one relationship
HasManyRel RelationshipType = "has_many" // HasManyRel has many relationship
BelongsToRel RelationshipType = "belongs_to" // BelongsToRel belongs to relationship
Many2ManyRel RelationshipType = "many_to_many" // Many2ManyRel many to many relationship
HasOne RelationshipType = "has_one" // HasOneRel has one relationship
HasMany RelationshipType = "has_many" // HasManyRel has many relationship
BelongsTo RelationshipType = "belongs_to" // BelongsToRel belongs to relationship
Many2Many RelationshipType = "many_to_many" // Many2ManyRel many to many relationship
)
type Relationships struct {
HasOne map[string]*Relationship
BelongsTo map[string]*Relationship
HasMany map[string]*Relationship
Many2Many map[string]*Relationship
HasOne []*Relationship
BelongsTo []*Relationship
HasMany []*Relationship
Many2Many []*Relationship
Relations map[string]*Relationship
}
type Relationship struct {
Name string
Type RelationshipType
ForeignKeys []*RelationField // self
AssociationForeignKeys []*RelationField // association
JoinTable *JoinTable
Field *Field
Polymorphic *Polymorphic
References []Reference
Schema *Schema
FieldSchema *Schema
JoinTable *Schema
ForeignKeys, AssociationForeignKeys []string
}
type RelationField struct {
*Field
PolymorphicField *Field
PolymorphicValue string
type Polymorphic struct {
PolymorphicID *Field
PolymorphicType *Field
Value string
}
type JoinTable struct {
Table string
ForeignKeys []*RelationField
AssociationForeignKeys []*RelationField
type Reference struct {
PriamryKey *Field
PriamryValue string
ForeignKey *Field
OwnPriamryKey bool
}
func (schema *Schema) buildToOneRel(field *Field) {
func (schema *Schema) parseRelation(field *Field) {
var (
fieldValue = reflect.New(field.FieldType).Interface()
relation = &Relationship{
Name: field.Name,
Field: field,
Schema: schema,
Type: RelationshipType(strings.ToLower(strings.TrimSpace(field.TagSettings["REL"]))),
ForeignKeys: toColumns(field.TagSettings["FOREIGNKEY"]),
AssociationForeignKeys: toColumns(field.TagSettings["ASSOCIATION_FOREIGNKEY"]),
}
)
if relation.FieldSchema, schema.err = Parse(fieldValue, schema.cacheStore, schema.namer); schema.err != nil {
return
}
// User has many Toys, its `Polymorphic` is `Owner`, Pet has one Toy, its `Polymorphic` is `Owner`
// type User struct {
// Toys []Toy `gorm:"polymorphic:Owner;"`
// }
// type Pet struct {
// Toy Toy `gorm:"polymorphic:Owner;"`
// }
// type Toy struct {
// OwnerID int
// OwnerType string
// }
if polymorphic, _ := field.TagSettings["POLYMORPHIC"]; polymorphic != "" {
relation.Polymorphic = &Polymorphic{
Value: schema.Table,
PolymorphicType: relation.FieldSchema.FieldsByName[polymorphic+"Type"],
PolymorphicID: relation.FieldSchema.FieldsByName[polymorphic+"ID"],
}
if value, ok := field.TagSettings["POLYMORPHIC_VALUE"]; ok {
relation.Polymorphic.Value = strings.TrimSpace(value)
}
if relation.Polymorphic.PolymorphicType == nil {
schema.err = fmt.Errorf("invalid polymorphic type: %v for %v on field %v, missing field %v", relation.FieldSchema, schema, field.Name, polymorphic+"Type")
}
if relation.Polymorphic.PolymorphicID == nil {
schema.err = fmt.Errorf("invalid polymorphic type: %v for %v on field %v, missing field %v", relation.FieldSchema, schema, field.Name, polymorphic+"ID")
}
if schema.err == nil {
relation.References = append(relation.References, Reference{
PriamryValue: relation.Polymorphic.Value,
ForeignKey: relation.Polymorphic.PolymorphicType,
})
primaryKeyField := schema.PrioritizedPrimaryField
if len(relation.ForeignKeys) > 0 {
if primaryKeyField = schema.LookUpField(relation.ForeignKeys[0]); primaryKeyField == nil || len(relation.ForeignKeys) > 1 {
schema.err = fmt.Errorf("invalid polymorphic foreign key: %+v for %v on field %v", relation.ForeignKeys, schema, field.Name)
}
}
relation.References = append(relation.References, Reference{
PriamryKey: primaryKeyField,
ForeignKey: relation.Polymorphic.PolymorphicType,
OwnPriamryKey: true,
})
}
switch field.FieldType.Kind() {
case reflect.Struct:
relation.Type = HasOne
case reflect.Slice:
relation.Type = HasMany
}
return
}
switch field.FieldType.Kind() {
case reflect.Struct:
schema.parseStructRelation(relation, field)
case reflect.Slice:
schema.parseSliceRelation(relation, field)
default:
schema.err = fmt.Errorf("unsupported data type: %v (in %v#%v ", field.FieldType.PkgPath(), schema, field.Name)
}
}
func (schema *Schema) buildToManyRel(field *Field) {
func (schema *Schema) parseStructRelation(relation *Relationship, field *Field) error {
return nil
}
func (schema *Schema) parseSliceRelation(relation *Relationship, field *Field) error {
return nil
}

53
schema/schema.go
View File

@ -1,6 +1,7 @@
package schema
import (
"fmt"
"go/ast"
"reflect"
"strings"
@ -8,6 +9,7 @@ import (
)
type Schema struct {
Name string
ModelType reflect.Type
Table string
PrioritizedPrimaryField *Field
@ -16,42 +18,64 @@ type Schema struct {
FieldsByName map[string]*Field
FieldsByDBName map[string]*Field
Relationships Relationships
err error
namer Namer
cacheStore sync.Map
}
func (schema Schema) String() string {
return schema.ModelType.PkgPath()
}
func (schema Schema) LookUpField(name string) *Field {
if field, ok := schema.FieldsByDBName[name]; ok {
return field
}
if field, ok := schema.FieldsByName[name]; ok {
return field
}
return nil
}
// get data type from dialector
func Parse(dest interface{}, cacheStore sync.Map, namer Namer) *Schema {
func Parse(dest interface{}, cacheStore sync.Map, namer Namer) (*Schema, error) {
modelType := reflect.ValueOf(dest).Type()
for modelType.Kind() == reflect.Slice || modelType.Kind() == reflect.Ptr {
modelType = modelType.Elem()
}
if modelType.Kind() != reflect.Struct {
return nil
if modelType.PkgPath() == "" {
return nil, fmt.Errorf("unsupported data %+v when parsing model", dest)
}
return nil, fmt.Errorf("unsupported data type %v when parsing model", modelType.PkgPath())
}
if v, ok := cacheStore.Load(modelType); ok {
return v.(*Schema)
return v.(*Schema), nil
}
schema := &Schema{
Name: modelType.Name(),
ModelType: modelType,
Table: namer.TableName(modelType.Name()),
FieldsByName: map[string]*Field{},
FieldsByDBName: map[string]*Field{},
cacheStore: cacheStore,
}
defer func() {
if schema.err != nil {
cacheStore.Delete(modelType)
}
}()
for i := 0; i < modelType.NumField(); i++ {
fieldStruct := modelType.Field(i)
if !ast.IsExported(fieldStruct.Name) {
continue
}
if fieldStruct := modelType.Field(i); ast.IsExported(fieldStruct.Name) {
field := schema.ParseField(fieldStruct)
schema.Fields = append(schema.Fields, field)
if field.EmbeddedbSchema != nil {
for _, f := range field.EmbeddedbSchema.Fields {
schema.Fields = append(schema.Fields, f)
if field.EmbeddedSchema != nil {
schema.Fields = append(schema.Fields, field.EmbeddedSchema.Fields...)
}
}
}
@ -85,7 +109,12 @@ func Parse(dest interface{}, cacheStore sync.Map, namer Namer) *Schema {
}
schema.PrimaryFields = append(schema.PrimaryFields, field)
}
if field.DataType == "" {
defer schema.parseRelation(field)
}
}
return schema
cacheStore.Store(modelType, schema)
return schema, schema.err
}

9
schema/utils.go
View File

@ -29,3 +29,12 @@ func checkTruth(val string) bool {
}
return true
}
func toColumns(val string) (results []string) {
if val != "" {
for _, v := range strings.Split(val, ",") {
results = append(results, strings.TrimSpace(v))
}
}
return
}