fix(postgres/conectionmanager): Don't leak postgres OIDs between instances

lib/dialects/postgres/connection-manager.js

@@ -29,6 +29,9 @@ ConnectionManager = function(dialect, sequelize) {
     throw err;
   }
 
+  this.oidMap = {};
+  this.arrayOidMap = {};
+
   this._oidsFetched = false;
   this.refreshTypeParser(dataTypes.postgres);
 };
@@ -41,23 +44,33 @@ ConnectionManager.prototype.$refreshTypeParser = function (dataType) {
 
   if (dataType.types.postgres.oids) {
     dataType.types.postgres.oids.forEach(function (oid) {
-      self.lib.types.setTypeParser(oid, function (value) {
+      self.oidMap[oid] = function (value) {
         return dataType.parse(value, oid, self.lib.types.getTypeParser);
-      });
+      };
     });
   }
 
   if (dataType.types.postgres.array_oids) {
     dataType.types.postgres.array_oids.forEach(function (oid) {
-      self.lib.types.setTypeParser(oid, function (value) {
+      self.arrayOidMap[oid] = function (value) {
         return self.lib.types.arrayParser.create(value, function (value) {
           return dataType.parse(value, oid, self.lib.types.getTypeParser);
         }).parse();
+      };
     });
-    });
   }
 };
 
+ConnectionManager.prototype.getTypeParser = function (oid, format) {
+  if (this.oidMap[oid]) {
+    return this.oidMap[oid];
+  } else if (this.arrayOidMap[oid]) {
+    return this.arrayOidMap[oid];
+  }
+
+  return this.lib.types.getTypeParser.apply(undefined, arguments);
+};
+
 ConnectionManager.prototype.connect = function(config) {
   var self = this
     , connectionConfig = {};
@@ -67,6 +80,10 @@ ConnectionManager.prototype.connect = function(config) {
     'user', 'password', 'host', 'database', 'port'
   ]);
 
+  connectionConfig.types = {
+    getTypeParser: ConnectionManager.prototype.getTypeParser.bind(this)
+  };
+
   if (config.dialectOptions) {
     Utils._.merge(connectionConfig,
                   Utils._.pick(config.dialectOptions, [