diff --git a/callback_shared.go b/callback_shared.go
index 3d8a245c..7fab779e 100644
--- a/callback_shared.go
+++ b/callback_shared.go
@@ -32,8 +32,8 @@ func SaveBeforeAssociations(scope *Scope) {
 				}
 				scope.Err(newDB.Save(value.Addr().Interface()).Error)
 
-				if relationship.ForeignKey != "" {
-					scope.SetColumn(relationship.ForeignKey, newDB.NewScope(value.Addr().Interface()).PrimaryKeyValue())
+				if relationship.ForeignFieldName != "" {
+					scope.SetColumn(relationship.ForeignFieldName, newDB.NewScope(value.Addr().Interface()).PrimaryKeyValue())
 				}
 				if relationship.ForeignType != "" {
 					scope.Err(fmt.Errorf("gorm does not support polymorphic belongs_to associations"))
@@ -58,8 +58,8 @@ func SaveAfterAssociations(scope *Scope) {
 						newDB := scope.NewDB()
 						elem := value.Index(i).Addr().Interface()
 
-						if relationship.JoinTable == "" && relationship.ForeignKey != "" {
-							newDB.NewScope(elem).SetColumn(relationship.ForeignKey, scope.PrimaryKeyValue())
+						if relationship.JoinTable == "" && relationship.ForeignFieldName != "" {
+							newDB.NewScope(elem).SetColumn(relationship.ForeignFieldName, scope.PrimaryKeyValue())
 						}
 						if relationship.ForeignType != "" {
 							newDB.NewScope(elem).SetColumn(relationship.ForeignType, scope.TableName())
@@ -74,9 +74,9 @@ func SaveAfterAssociations(scope *Scope) {
 
 							newScope := scope.New(elem)
 							joinTable := relationship.JoinTable
-							foreignKey := ToSnake(relationship.ForeignKey)
+							foreignKey := ToSnake(relationship.ForeignFieldName)
 							foreignValue := fmt.Sprintf("%v", scope.PrimaryKeyValue())
-							associationForeignKey := ToSnake(relationship.AssociationForeignKey)
+							associationForeignKey := ToSnake(relationship.AssociationForeignFieldName)
 							associationForeignValue := fmt.Sprintf("%v", newScope.PrimaryKeyValue())
 
 							newScope.Raw(fmt.Sprintf(
@@ -97,8 +97,8 @@ func SaveAfterAssociations(scope *Scope) {
 				default:
 					newDB := scope.NewDB()
 					if value.CanAddr() {
-						if relationship.ForeignKey != "" {
-							newDB.NewScope(value.Addr().Interface()).SetColumn(relationship.ForeignKey, scope.PrimaryKeyValue())
+						if relationship.ForeignFieldName != "" {
+							newDB.NewScope(value.Addr().Interface()).SetColumn(relationship.ForeignFieldName, scope.PrimaryKeyValue())
 						}
 						if relationship.ForeignType != "" {
 							newDB.NewScope(value.Addr().Interface()).SetColumn(relationship.ForeignType, scope.TableName())
@@ -112,8 +112,8 @@ func SaveAfterAssociations(scope *Scope) {
 						}
 
 						elem := destValue.Addr().Interface()
-						if relationship.ForeignKey != "" {
-							newDB.NewScope(elem).SetColumn(relationship.ForeignKey, scope.PrimaryKeyValue())
+						if relationship.ForeignFieldName != "" {
+							newDB.NewScope(elem).SetColumn(relationship.ForeignFieldName, scope.PrimaryKeyValue())
 						}
 						if relationship.ForeignType != "" {
 							newDB.NewScope(value.Addr().Interface()).SetColumn(relationship.ForeignType, scope.TableName())
diff --git a/main.go b/main.go
index 377e0a25..0cf94eb1 100644
--- a/main.go
+++ b/main.go
@@ -430,7 +430,7 @@ func (s *DB) Association(column string) *Association {
 	var field *Field
 	var ok bool
 	if field, ok = scope.FieldByName(column); ok {
-		if field.Relationship == nil || field.Relationship.ForeignKey == "" {
+		if field.Relationship == nil || field.Relationship.ForeignFieldName == "" {
 			scope.Err(fmt.Errorf("invalid association %v for %v", column, scope.IndirectValue().Type()))
 		}
 	} else {
diff --git a/model_struct.go b/model_struct.go
index 9f641443..af062567 100644
--- a/model_struct.go
+++ b/model_struct.go
@@ -2,9 +2,12 @@ package gorm
 
 import (
 	"database/sql"
+	"fmt"
 	"go/ast"
 	"reflect"
+	"regexp"
 	"strconv"
+	"strings"
 	"time"
 )
 
@@ -23,7 +26,10 @@ type StructField struct {
 	IsNormal     bool
 	IsIgnored    bool
 	DefaultValue *string
+	GormSettings map[string]string
+	SqlSettings  map[string]string
 	SqlTag       string
+	Struct       reflect.StructField
 	Relationship *Relationship
 }
 
@@ -37,14 +43,81 @@ type Relationship struct {
 	JoinTable                   string
 }
 
-func (scope *Scope) GetStructFields() (fields []*StructField) {
+func (scope *Scope) GenerateSqlTag(field *StructField) {
+	var sqlType string
+	reflectValue := reflect.New(field.Struct.Type)
+
+	if value, ok := field.SqlSettings["TYPE"]; ok {
+		sqlType = value
+	}
+
+	additionalType := field.SqlSettings["NOT NULL"] + " " + field.SqlSettings["UNIQUE"]
+	if value, ok := field.SqlSettings["DEFAULT"]; ok {
+		additionalType = additionalType + "DEFAULT " + value
+	}
+
+	if field.IsScanner {
+		var getScannerValue func(reflect.Value)
+		getScannerValue = func(reflectValue reflect.Value) {
+			if _, isScanner := reflect.New(reflectValue.Type()).Interface().(sql.Scanner); isScanner {
+				getScannerValue(reflectValue.Field(0))
+			}
+		}
+		getScannerValue(reflectValue.Field(0))
+	}
+
+	if sqlType == "" {
+		var size = 255
+
+		if value, ok := field.SqlSettings["SIZE"]; ok {
+			size, _ = strconv.Atoi(value)
+		}
+
+		if field.IsPrimaryKey {
+			sqlType = scope.Dialect().PrimaryKeyTag(reflectValue, size)
+		} else {
+			sqlType = scope.Dialect().SqlTag(reflectValue, size)
+		}
+	}
+
+	if strings.TrimSpace(additionalType) == "" {
+		field.SqlTag = sqlType
+	} else {
+		field.SqlTag = fmt.Sprintf("%v %v", sqlType, additionalType)
+	}
+}
+
+var pluralMapKeys = []*regexp.Regexp{regexp.MustCompile("ch$"), regexp.MustCompile("ss$"), regexp.MustCompile("sh$"), regexp.MustCompile("day$"), regexp.MustCompile("y$"), regexp.MustCompile("x$"), regexp.MustCompile("([^s])s?$")}
+var pluralMapValues = []string{"ches", "sses", "shes", "days", "ies", "xes", "${1}s"}
+
+func (scope *Scope) GetModelStruct() *ModelStruct {
+	var modelStruct ModelStruct
+
 	reflectValue := reflect.Indirect(reflect.ValueOf(scope.Value))
 	if reflectValue.Kind() == reflect.Slice {
 		reflectValue = reflect.Indirect(reflect.New(reflectValue.Elem().Type()))
 	}
-
 	scopeTyp := reflectValue.Type()
-	hasPrimaryKey := false
+
+	// Set tablename
+	if fm := reflect.New(scopeTyp).MethodByName("TableName"); fm.IsValid() {
+		if results := fm.Call([]reflect.Value{}); len(results) > 0 {
+			if name, ok := results[0].Interface().(string); ok {
+				modelStruct.TableName = name
+			}
+		}
+	} else {
+		modelStruct.TableName = ToSnake(scopeTyp.Name())
+		if scope.db == nil || !scope.db.parent.singularTable {
+			for index, reg := range pluralMapKeys {
+				if reg.MatchString(modelStruct.TableName) {
+					modelStruct.TableName = reg.ReplaceAllString(modelStruct.TableName, pluralMapValues[index])
+				}
+			}
+		}
+	}
+
+	// Set fields
 	for i := 0; i < scopeTyp.NumField(); i++ {
 		fieldStruct := scopeTyp.Field(i)
 		if !ast.IsExported(fieldStruct.Name) {
@@ -52,21 +125,22 @@ func (scope *Scope) GetStructFields() (fields []*StructField) {
 		}
 		var field *StructField
 
+		field.Struct = fieldStruct
 		if fieldStruct.Tag.Get("sql") == "-" {
 			field.IsIgnored = true
 		} else {
-			sqlSettings := parseTagSetting(fieldStruct.Tag.Get("sql"))
-			settings := parseTagSetting(fieldStruct.Tag.Get("gorm"))
-			if _, ok := settings["PRIMARY_KEY"]; ok {
+			field.SqlSettings = parseTagSetting(fieldStruct.Tag.Get("sql"))
+			field.GormSettings = parseTagSetting(fieldStruct.Tag.Get("gorm"))
+			if _, ok := field.GormSettings["PRIMARY_KEY"]; ok {
 				field.IsPrimaryKey = true
-				hasPrimaryKey = true
+				modelStruct.PrimaryKeyField = field
 			}
 
-			if value, ok := sqlSettings["DEFAULT"]; ok {
+			if value, ok := field.SqlSettings["DEFAULT"]; ok {
 				field.DefaultValue = &value
 			}
 
-			if value, ok := settings["COLUMN"]; ok {
+			if value, ok := field.GormSettings["COLUMN"]; ok {
 				field.DBName = value
 			} else {
 				field.DBName = ToSnake(fieldStruct.Name)
@@ -85,11 +159,11 @@ func (scope *Scope) GetStructFields() (fields []*StructField) {
 				field.IsTime, field.IsNormal = true, true
 			}
 
-			many2many := settings["MANY2MANY"]
-			foreignKey := SnakeToUpperCamel(settings["FOREIGNKEY"])
-			foreignType := SnakeToUpperCamel(settings["FOREIGNTYPE"])
-			associationForeignKey := SnakeToUpperCamel(settings["ASSOCIATIONFOREIGNKEY"])
-			if polymorphic := SnakeToUpperCamel(settings["POLYMORPHIC"]); polymorphic != "" {
+			many2many := field.GormSettings["MANY2MANY"]
+			foreignKey := SnakeToUpperCamel(field.GormSettings["FOREIGNKEY"])
+			foreignType := SnakeToUpperCamel(field.GormSettings["FOREIGNTYPE"])
+			associationForeignKey := SnakeToUpperCamel(field.GormSettings["ASSOCIATIONFOREIGNKEY"])
+			if polymorphic := SnakeToUpperCamel(field.GormSettings["POLYMORPHIC"]); polymorphic != "" {
 				foreignKey = polymorphic + "Id"
 				foreignType = polymorphic + "Type"
 			}
@@ -119,20 +193,20 @@ func (scope *Scope) GetStructFields() (fields []*StructField) {
 							foreignKey = ""
 						}
 
-						field.Relationship = &relationship{
-							JoinTable:             many2many,
-							ForeignKey:            foreignKey,
-							ForeignType:           foreignType,
-							AssociationForeignKey: associationForeignKey,
+						field.Relationship = &Relationship{
+							JoinTable:                   many2many,
+							ForeignType:                 foreignType,
+							ForeignFieldName:            foreignKey,
+							AssociationForeignFieldName: associationForeignKey,
 							Kind: kind,
 						}
 					} else {
 						field.IsNormal = true
 					}
 				case reflect.Struct:
-					if _, ok := settings["EMBEDDED"]; ok || fieldStruct.Anonymous {
+					if _, ok := field.GormSettings["EMBEDDED"]; ok || fieldStruct.Anonymous {
 						for _, field := range scope.New(reflect.New(indirectType).Interface()).GetStructFields() {
-							fields = append(fields, field)
+							modelStruct.StructFields = append(modelStruct.StructFields, field)
 						}
 						break
 					} else {
@@ -154,7 +228,7 @@ func (scope *Scope) GetStructFields() (fields []*StructField) {
 							kind = "has_one"
 						}
 
-						field.Relationship = &relationship{ForeignKey: foreignKey, ForeignType: foreignType, Kind: kind}
+						field.Relationship = &Relationship{ForeignFieldName: foreignKey, ForeignType: foreignType, Kind: kind}
 					}
 
 				default:
@@ -162,64 +236,21 @@ func (scope *Scope) GetStructFields() (fields []*StructField) {
 				}
 			}
 		}
-		fields = append(fields, field)
+		modelStruct.StructFields = append(modelStruct.StructFields, field)
 	}
 
-	if !hasPrimaryKey {
-		for _, field := range fields {
-			if field.DBName == "id" {
-				field.IsPrimaryKey = true
-			}
+	for _, field := range modelStruct.StructFields {
+		if modelStruct.PrimaryKeyField == nil && field.DBName == "id" {
+			field.IsPrimaryKey = true
+			modelStruct.PrimaryKeyField = field
 		}
+
+		scope.GenerateSqlTag(field)
 	}
 
-	for _, field := range fields {
-		var sqlType string
-		size := 255
-		sqlTag := field.Tag.Get("sql")
-		sqlSetting = parseTagSetting(sqlTag)
-
-		if value, ok := sqlSetting["SIZE"]; ok {
-			if i, err := strconv.Atoi(value); err == nil {
-				size = i
-			} else {
-				size = 0
-			}
-		}
-
-		if value, ok := sqlSetting["TYPE"]; ok {
-			typ = value
-		}
-
-		additionalType := sqlSetting["NOT NULL"] + " " + sqlSetting["UNIQUE"]
-		if value, ok := sqlSetting["DEFAULT"]; ok {
-			additionalType = additionalType + "DEFAULT " + value
-		}
-
-		if field.IsScanner {
-			var getScannerValue func(reflect.Value)
-			getScannerValue = func(reflectValue reflect.Value) {
-				if _, isScanner := reflect.New(reflectValue.Type()).Interface().(sql.Scanner); isScanner {
-					getScannerValue(reflectValue.Field(0))
-				}
-			}
-			getScannerValue(reflectValue.Field(0))
-		}
-		if field.IsNormal {
-			typ + " " + additionalType
-		} else if !field.IsTime {
-			return typ + " " + additionalType
-		}
-
-		if len(typ) == 0 {
-			if field.IsPrimaryKey {
-				typ = scope.Dialect().PrimaryKeyTag(reflectValue, size)
-			} else {
-				typ = scope.Dialect().SqlTag(reflectValue, size)
-			}
-		}
-
-		return typ + " " + additionalType
-	}
-	return
+	return &modelStruct
+}
+
+func (scope *Scope) GetStructFields() (fields []*StructField) {
+	return scope.GetModelStruct().StructFields
 }
diff --git a/preload.go b/preload.go
index 87ee5065..7ac0db0d 100644
--- a/preload.go
+++ b/preload.go
@@ -46,14 +46,14 @@ func Preload(scope *Scope) {
 
 					switch relation.Kind {
 					case "has_one":
-						condition := fmt.Sprintf("%v IN (?)", scope.Quote(relation.ForeignDBName()))
+						condition := fmt.Sprintf("%v IN (?)", scope.Quote(relation.ForeignDBName))
 						scope.NewDB().Where(condition, scope.getColumnAsArray(primaryName)).Find(results, conditions...)
 
 						resultValues := reflect.Indirect(reflect.ValueOf(results))
 						for i := 0; i < resultValues.Len(); i++ {
 							result := resultValues.Index(i)
 							if isSlice {
-								value := getFieldValue(result, relation.ForeignKey)
+								value := getFieldValue(result, relation.ForeignFieldName)
 								objects := scope.IndirectValue()
 								for j := 0; j < objects.Len(); j++ {
 									if equalAsString(getFieldValue(objects.Index(j), primaryName), value) {
@@ -66,13 +66,13 @@ func Preload(scope *Scope) {
 							}
 						}
 					case "has_many":
-						condition := fmt.Sprintf("%v IN (?)", scope.Quote(relation.ForeignDBName()))
+						condition := fmt.Sprintf("%v IN (?)", scope.Quote(relation.ForeignDBName))
 						scope.NewDB().Where(condition, scope.getColumnAsArray(primaryName)).Find(results, conditions...)
 						resultValues := reflect.Indirect(reflect.ValueOf(results))
 						if isSlice {
 							for i := 0; i < resultValues.Len(); i++ {
 								result := resultValues.Index(i)
-								value := getFieldValue(result, relation.ForeignKey)
+								value := getFieldValue(result, relation.ForeignFieldName)
 								objects := scope.IndirectValue()
 								for j := 0; j < objects.Len(); j++ {
 									object := reflect.Indirect(objects.Index(j))
@@ -87,7 +87,7 @@ func Preload(scope *Scope) {
 							scope.SetColumn(field, resultValues)
 						}
 					case "belongs_to":
-						scope.NewDB().Where(scope.getColumnAsArray(relation.ForeignKey)).Find(results, conditions...)
+						scope.NewDB().Where(scope.getColumnAsArray(relation.ForeignFieldName)).Find(results, conditions...)
 						resultValues := reflect.Indirect(reflect.ValueOf(results))
 						for i := 0; i < resultValues.Len(); i++ {
 							result := resultValues.Index(i)
@@ -96,7 +96,7 @@ func Preload(scope *Scope) {
 								objects := scope.IndirectValue()
 								for j := 0; j < objects.Len(); j++ {
 									object := reflect.Indirect(objects.Index(j))
-									if equalAsString(getFieldValue(object, relation.ForeignKey), value) {
+									if equalAsString(getFieldValue(object, relation.ForeignFieldName), value) {
 										object.FieldByName(field.Name).Set(result)
 									}
 								}
diff --git a/scope.go b/scope.go
index 5850a517..0bee5b9b 100644
--- a/scope.go
+++ b/scope.go
@@ -7,7 +7,6 @@ import (
 	"time"
 
 	"reflect"
-	"regexp"
 )
 
 type Scope struct {
@@ -227,8 +226,6 @@ func (scope *Scope) AddToVars(value interface{}) string {
 }
 
 // TableName get table name
-var pluralMapKeys = []*regexp.Regexp{regexp.MustCompile("ch$"), regexp.MustCompile("ss$"), regexp.MustCompile("sh$"), regexp.MustCompile("day$"), regexp.MustCompile("y$"), regexp.MustCompile("x$"), regexp.MustCompile("([^s])s?$")}
-var pluralMapValues = []string{"ches", "sses", "shes", "days", "ies", "xes", "${1}s"}
 
 func (scope *Scope) TableName() string {
 	if scope.Search != nil && len(scope.Search.TableName) > 0 {
diff --git a/scope_private.go b/scope_private.go
index 2e44c7b0..8473fab9 100644
--- a/scope_private.go
+++ b/scope_private.go
@@ -364,69 +364,6 @@ func (scope *Scope) updatedAttrsWithValues(values map[string]interface{}, ignore
 	return
 }
 
-func (scope *Scope) sqlTagForField(field *Field) (typ string) {
-	if scope.db == nil {
-		return ""
-	}
-	var size = 255
-
-	fieldTag := field.Tag.Get(scope.db.parent.tagIdentifier)
-	var setting = parseTagSetting(fieldTag)
-
-	if value, ok := setting["SIZE"]; ok {
-		if i, err := strconv.Atoi(value); err == nil {
-			size = i
-		} else {
-			size = 0
-		}
-	}
-
-	if value, ok := setting["TYPE"]; ok {
-		typ = value
-	}
-
-	additionalType := setting["NOT NULL"] + " " + setting["UNIQUE"]
-	if value, ok := setting["DEFAULT"]; ok {
-		additionalType = additionalType + "DEFAULT " + value
-	}
-
-	value := field.Field.Interface()
-	reflectValue := field.Field
-	if reflectValue.Kind() == reflect.Ptr {
-		reflectValue = reflect.New(reflectValue.Type().Elem()).Elem()
-	}
-
-	switch reflectValue.Kind() {
-	case reflect.Slice:
-		if _, ok := value.([]byte); !ok {
-			return typ + " " + additionalType
-		}
-	case reflect.Struct:
-		if field.IsScanner {
-			var getScannerValue func(reflect.Value)
-			getScannerValue = func(value reflect.Value) {
-				reflectValue = value
-				if _, isScanner := reflect.New(reflectValue.Type()).Interface().(sql.Scanner); isScanner {
-					getScannerValue(reflectValue.Field(0))
-				}
-			}
-			getScannerValue(reflectValue.Field(0))
-		} else if !field.IsTime {
-			return typ + " " + additionalType
-		}
-	}
-
-	if len(typ) == 0 {
-		if field.IsPrimaryKey {
-			typ = scope.Dialect().PrimaryKeyTag(reflectValue, size)
-		} else {
-			typ = scope.Dialect().SqlTag(reflectValue, size)
-		}
-	}
-
-	return typ + " " + additionalType
-}
-
 func (scope *Scope) row() *sql.Row {
 	defer scope.Trace(NowFunc())
 	scope.prepareQuerySql()
@@ -495,7 +432,7 @@ func (scope *Scope) related(value interface{}, foreignKeys ...string) *Scope {
 			foreignKey = keys[1]
 		}
 
-		var relationship *relationship
+		var relationship *Relationship
 		var field *Field
 		var scopeHasField bool
 		if field, scopeHasField = scope.FieldByName(foreignKey); scopeHasField {
@@ -504,8 +441,8 @@ func (scope *Scope) related(value interface{}, foreignKeys ...string) *Scope {
 
 		if scopeType == "" || scopeType == fromScopeType {
 			if scopeHasField {
-				if relationship != nil && relationship.ForeignKey != "" {
-					foreignKey = relationship.ForeignKey
+				if relationship != nil && relationship.ForeignFieldName != "" {
+					foreignKey = relationship.ForeignFieldName
 				}
 
 				if relationship != nil && relationship.Kind == "many_to_many" {
@@ -516,10 +453,10 @@ func (scope *Scope) related(value interface{}, foreignKeys ...string) *Scope {
 						"INNER JOIN %v ON %v.%v = %v.%v",
 						scope.Quote(relationship.JoinTable),
 						scope.Quote(relationship.JoinTable),
-						scope.Quote(ToSnake(relationship.AssociationForeignKey)),
+						scope.Quote(ToSnake(relationship.AssociationForeignFieldName)),
 						toScope.QuotedTableName(),
 						scope.Quote(toScope.PrimaryKey()))
-					whereSql := fmt.Sprintf("%v.%v = ?", scope.Quote(relationship.JoinTable), scope.Quote(ToSnake(relationship.ForeignKey)))
+					whereSql := fmt.Sprintf("%v.%v = ?", scope.Quote(relationship.JoinTable), scope.Quote(ToSnake(relationship.ForeignFieldName)))
 					toScope.db.Joins(joinSql).Where(whereSql, scope.PrimaryKeyValue()).Find(value)
 					return scope
 				}
@@ -567,8 +504,8 @@ func (scope *Scope) createJoinTable(field *Field) {
 			newScope.Raw(fmt.Sprintf("CREATE TABLE %v (%v)",
 				field.Relationship.JoinTable,
 				strings.Join([]string{
-					scope.Quote(ToSnake(field.Relationship.ForeignKey)) + " " + primaryKeySqlType,
-					scope.Quote(ToSnake(field.Relationship.AssociationForeignKey)) + " " + primaryKeySqlType}, ",")),
+					scope.Quote(ToSnake(field.Relationship.ForeignFieldName)) + " " + primaryKeySqlType,
+					scope.Quote(ToSnake(field.Relationship.AssociationForeignFieldName)) + " " + primaryKeySqlType}, ",")),
 			).Exec()
 			scope.Err(newScope.db.Error)
 		}