fix(changeColumn): use engine defaults for foreign/unique key naming (#9890)

lib/dialects/mssql/query-generator.js

@@ -260,8 +260,7 @@ class MSSQLQueryGenerator extends AbstractQueryGenerator {
     for (const attributeName in attributes) {
       const definition = attributes[attributeName];
       if (definition.match(/REFERENCES/)) {
-        constraintString.push(_.template('<%= fkName %> FOREIGN KEY (<%= attrName %>) <%= definition %>', this._templateSettings)({
-          fkName: this.quoteIdentifier(attributeName + '_foreign_idx'),
+        constraintString.push(_.template('FOREIGN KEY (<%= attrName %>) <%= definition %>', this._templateSettings)({
           attrName: this.quoteIdentifier(attributeName),
           definition: definition.replace(/.+?(?=REFERENCES)/, '')
         }));
@@ -279,7 +278,7 @@ class MSSQLQueryGenerator extends AbstractQueryGenerator {
       finalQuery += constraintString.length ? ' ' : '';
     }
     if (constraintString.length) {
-      finalQuery += 'ADD CONSTRAINT ' + constraintString.join(', ');
+      finalQuery += 'ADD ' + constraintString.join(', ');
     }
 
     return _.template(query, this._templateSettings)({

lib/dialects/mysql/query-generator.js

@@ -141,10 +141,9 @@ class MySQLQueryGenerator extends AbstractQueryGenerator {
     for (const attributeName in attributes) {
       let definition = attributes[attributeName];
       if (definition.match(/REFERENCES/)) {
-        const fkName = this.quoteIdentifier(tableName + '_' + attributeName + '_foreign_idx');
         const attrName = this.quoteIdentifier(attributeName);
         definition = definition.replace(/.+?(?=REFERENCES)/, '');
-        constraintString.push(`${fkName} FOREIGN KEY (${attrName}) ${definition}`);
+        constraintString.push(`FOREIGN KEY (${attrName}) ${definition}`);
       } else {
         attrString.push('`' + attributeName + '` `' + attributeName + '` ' + definition);
       }
@@ -156,7 +155,7 @@ class MySQLQueryGenerator extends AbstractQueryGenerator {
       finalQuery += constraintString.length ? ' ' : '';
     }
     if (constraintString.length) {
-      finalQuery += 'ADD CONSTRAINT ' + constraintString.join(', ');
+      finalQuery += 'ADD ' + constraintString.join(', ');
     }
 
     return `ALTER TABLE ${this.quoteTable(tableName)} ${finalQuery};`;

lib/dialects/postgres/query-generator.js

@@ -294,7 +294,7 @@ class PostgresQueryGenerator extends AbstractQueryGenerator {
 
         attrSql += _.template(query.replace('ALTER COLUMN', ''), this._templateSettings)({
           tableName: this.quoteTable(tableName),
-          query: 'ADD CONSTRAINT ' + this.quoteIdentifier(attributeName + '_unique_idx') + ' UNIQUE (' + this.quoteIdentifier(attributeName) + ')'
+          query: 'ADD UNIQUE (' + this.quoteIdentifier(attributeName) + ')'
         });
       }
 
@@ -302,7 +302,7 @@ class PostgresQueryGenerator extends AbstractQueryGenerator {
         definition = definition.replace(/.+?(?=REFERENCES)/, '');
         attrSql += _.template(query.replace('ALTER COLUMN', ''), this._templateSettings)({
           tableName: this.quoteTable(tableName),
-          query: 'ADD CONSTRAINT ' + this.quoteIdentifier(attributeName + '_foreign_idx') + ' FOREIGN KEY (' + this.quoteIdentifier(attributeName) + ') ' + definition
+          query: 'ADD FOREIGN KEY (' + this.quoteIdentifier(attributeName) + ') ' + definition
         });
       } else {
         attrSql += _.template(query, this._templateSettings)({

test/integration/query-interface/changeColumn.test.js

@@ -113,7 +113,7 @@ describe(Support.getTestDialectTeaser('QueryInterface'), () => {
       });
     }
 
-    //SQlite navitely doesnt support ALTER Foreign key
+    //SQlite natively doesn't support ALTER Foreign key
     if (dialect !== 'sqlite') {
       describe('should support foreign keys', () => {
         beforeEach(function() {

test/unit/sql/change-column.test.js

@@ -62,9 +62,9 @@ if (current.dialect.name !== 'sqlite') {
           onDelete: 'cascade'
         }).then(sql => {
           expectsql(sql, {
-            mssql: 'ALTER TABLE [users] ADD CONSTRAINT [level_id_foreign_idx] FOREIGN KEY ([level_id]) REFERENCES [level] ([id]) ON DELETE CASCADE;',
-            mysql: 'ALTER TABLE `users` ADD CONSTRAINT `users_level_id_foreign_idx` FOREIGN KEY (`level_id`) REFERENCES `level` (`id`) ON DELETE CASCADE ON UPDATE CASCADE;',
-            postgres: 'ALTER TABLE "users"  ADD CONSTRAINT "level_id_foreign_idx" FOREIGN KEY ("level_id") REFERENCES "level" ("id") ON DELETE CASCADE ON UPDATE CASCADE;'
+            mssql: 'ALTER TABLE [users] ADD FOREIGN KEY ([level_id]) REFERENCES [level] ([id]) ON DELETE CASCADE;',
+            mysql: 'ALTER TABLE `users` ADD FOREIGN KEY (`level_id`) REFERENCES `level` (`id`) ON DELETE CASCADE ON UPDATE CASCADE;',
+            postgres: 'ALTER TABLE "users"  ADD FOREIGN KEY ("level_id") REFERENCES "level" ("id") ON DELETE CASCADE ON UPDATE CASCADE;'
           });
         });
       });