Turn on foreign key checking for SQLite

lib/dialects/sqlite/connector-manager.js

@@ -6,10 +6,21 @@ module.exports = (function() {
   var ConnectorManager = function(sequelize) {
   var ConnectorManager = function(sequelize) {
     this.sequelize = sequelize
     this.sequelize = sequelize
     this.database  = new sqlite3.Database(sequelize.options.storage || ':memory:')
     this.database  = new sqlite3.Database(sequelize.options.storage || ':memory:')
+    this.opened    = false
   }
   }
   Utils._.extend(ConnectorManager.prototype, require("../connector-manager").prototype)
   Utils._.extend(ConnectorManager.prototype, require("../connector-manager").prototype)
 
 
   ConnectorManager.prototype.query = function(sql, callee, options) {
   ConnectorManager.prototype.query = function(sql, callee, options) {
+    var self = this
+    // Turn on foreign key checking (if the database has any) unless explicitly
+    // disallowed globally.
+    if(!this.opened && this.sequelize.options.foreignKeys !== false) {
+      this.database.serialize(function() {
+        self.database.run("PRAGMA FOREIGN_KEYS = ON")
+        self.opened = true
+      })
+    }
+
     return new Query(this.database, this.sequelize, callee, options).run(sql)
     return new Query(this.database, this.sequelize, callee, options).run(sql)
   }
   }