fix(getForeignKeysForTables): properly parse multiple fk

lib/dialects/mssql/query.js

@@ -235,7 +235,7 @@ class Query extends AbstractQuery {
     } else if (this.isVersionQuery()) {
     } else if (this.isVersionQuery()) {
       result = data[0].version;
       result = data[0].version;
     } else if (this.isForeignKeysQuery()) {
     } else if (this.isForeignKeysQuery()) {
-      result = [data];
+      result = data;
     } else if (this.isInsertQuery() || this.isUpdateQuery()) {
     } else if (this.isInsertQuery() || this.isUpdateQuery()) {
       result = [result, rowCount];
       result = [result, rowCount];
     } else if (this.isShowConstraintsQuery()) {
     } else if (this.isShowConstraintsQuery()) {

lib/dialects/mysql/query.js

@@ -138,7 +138,7 @@ class Query extends AbstractQuery {
     } else if (this.isVersionQuery()) {
     } else if (this.isVersionQuery()) {
       result = data[0].version;
       result = data[0].version;
     } else if (this.isForeignKeysQuery()) {
     } else if (this.isForeignKeysQuery()) {
-      result = [data];
+      result = data;
     } else if (this.isInsertQuery() || this.isUpdateQuery()) {
     } else if (this.isInsertQuery() || this.isUpdateQuery()) {
       result = [result, data.affectedRows];
       result = [result, data.affectedRows];
     } else if (this.isShowConstraintsQuery()) {
     } else if (this.isShowConstraintsQuery()) {

lib/query-interface.js

@@ -671,7 +671,7 @@ class QueryInterface {
     options = _.assign({}, options || {}, { type: QueryTypes.FOREIGNKEYS });
     options = _.assign({}, options || {}, { type: QueryTypes.FOREIGNKEYS });
 
 
     return Promise.map(tableNames, tableName =>
     return Promise.map(tableNames, tableName =>
-      this.sequelize.query(this.QueryGenerator.getForeignKeysQuery(tableName, this.sequelize.config.database), options).get(0)
+      this.sequelize.query(this.QueryGenerator.getForeignKeysQuery(tableName, this.sequelize.config.database), options)
     ).then(results => {
     ).then(results => {
       const result = {};
       const result = {};
 
 
@@ -680,7 +680,11 @@ class QueryInterface {
           tableName = tableName.schema + '.' + tableName.tableName;
           tableName = tableName.schema + '.' + tableName.tableName;
         }
         }
 
 
-        result[tableName] = _.compact(results[i]).map(r => r.constraint_name);
+        result[tableName] = _.isArray(results[i])
+          ? results[i].map(r => r.constraint_name)
+          : [results[i] && results[i].constraint_name];
+
+        result[tableName] = result[tableName].filter(_.identity);
       });
       });
 
 
       return result;
       return result;