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foreign_key.go
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foreign_key.go
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package migo
import (
"fmt"
"github.com/pkg/errors"
schema "github.com/lestrrat/go-jsschema"
)
type ForeignKey struct {
Name string `json:"name"`
SourceTable Table `json:"source_table"`
SourceColumn Column `json:"source_column"`
TargetTable Table `json:"target_table"`
TargetColumn Column `json:"column"`
UpdateCascade bool `json:"update_cascade"`
DeleteCascade bool `json:"delete_cascade"`
Raw map[string]interface{} `json:"-"`
}
type ForeignKeys []ForeignKey
func (k ForeignKeys) Len() int {
return len(k)
}
func (k ForeignKeys) Less(i, j int) bool {
return k[i].Name < k[j].Name
}
func (k ForeignKeys) Swap(i, j int) {
k[i], k[j] = k[j], k[i]
}
func NewForeignKey(sourceTable Table, sourceColumn Column) ForeignKey {
return ForeignKey{
SourceColumn: sourceColumn,
SourceTable: sourceTable,
}
}
func (fk *ForeignKey) read(s schema.Schema) error {
if !hasForeignKey(s) {
return errors.New("foreign not found")
}
m, ok := s.Extras["column"].(map[string]interface{})
if !ok {
return errors.New("column: fail to convert type to column")
}
fk.Raw, ok = m["foreign_key"].(map[string]interface{})
if !ok {
return errors.New("foreign key: fail to convert type")
}
if fk.Raw["name"] == nil {
return errors.New("name is not found")
}
fk.Name, ok = fk.Raw["name"].(string)
if !ok {
return errors.New("convert name to string type")
}
if fk.Raw["delete_cascade"] != nil {
fk.DeleteCascade, ok = fk.Raw["delete_cascade"].(bool)
if !ok {
return errors.New("convert delete_cascade to bool type")
}
}
if fk.Raw["update_cascade"] != nil {
fk.DeleteCascade, ok = fk.Raw["update_cascade"].(bool)
if !ok {
return errors.New("convert update_cascade to bool type")
}
}
return nil
}
func (fk *ForeignKey) resolve(s State) error {
if fk.Raw["target_table"] == nil {
return errors.New("target_table is null")
}
str, ok := fk.Raw["target_table"].(string)
if !ok {
return fmt.Errorf("%s have not string type", fk.Raw["target_table"])
}
t, err := s.findTableWithID(str)
if err != nil {
return fmt.Errorf("JSON Path %s table is not found", fk.Raw["target_table"])
}
fk.TargetTable = t
if fk.Raw["target_column"] == nil {
return errors.New("source_column is null")
}
str, ok = fk.Raw["target_column"].(string)
if !ok {
return fmt.Errorf("%s have not string type", fk.Raw["target_column"])
}
c, err := t.findColumnWithID(str)
if err != nil {
return fmt.Errorf("column %s in table %s is not found", fk.Raw["target_column"], t.Name)
}
fk.TargetColumn = c
return nil
}