tablet/gorm
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

"Fix "foreign key too long" bug for any identifier"

Browse Source 
I use SHA1 to generate a unique hash using the identifier.
I ignore the underscores.
Then I use the hash rather than the identifier
This commit is contained in:
cristian-sima 2016-03-03 22:03:41 +02:00
parent e1df3994fb
commit 7b6cd38e58
1 changed files with 16 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
scope_private.go
View File

@ -1,6 +1,7 @@
package gorm
import (
"crypto/sha1"
"database/sql"
"database/sql/driver"
"fmt"
@ -619,10 +620,21 @@ func (scope *Scope) addIndex(unique bool, indexName string, column ...string) {
}
func (scope *Scope) addForeignKey(field string, dest string, onDelete string, onUpdate string) {
var keyName = fmt.Sprintf("%s_%s_%s_foreign", scope.TableName(), field, dest)
keyName = regexp.MustCompile("(_*[^a-zA-Z]+_*|_+)").ReplaceAllString(keyName, "_")
var query = `ALTER TABLE %s ADD CONSTRAINT %s FOREIGN KEY (%s) REFERENCES %s ON DELETE %s ON UPDATE %s;`
scope.Raw(fmt.Sprintf(query, scope.QuotedTableName(), scope.QuoteIfPossible(keyName), scope.QuoteIfPossible(field), dest, onDelete, onUpdate)).Exec()
getHash := func(rawKey string) string {
h := sha1.New()
h.Write([]byte(rawKey))
bs := h.Sum(nil)
return fmt.Sprintf("%x", bs)
}
keyName := scope.TableName() + field + dest
hash := getHash(keyName)
query := `ALTER TABLE ` + scope.QuotedTableName() +
` ADD CONSTRAINT ` + "`" + hash + "`" +
` FOREIGN KEY (` + scope.QuoteIfPossible(field) + `)` +
` REFERENCES ` + dest +
` ON DELETE ` + onDelete +
` ON UPDATE ` + onUpdate + `;`
scope.Raw(query).Exec()
}
func (scope *Scope) removeIndex(indexName string) {