Support PostgreSQL JSON datatype in models

lib/data-types.js

@@ -404,6 +404,11 @@ module.exports = {
   HSTORE: 'HSTORE',
 
   /**
+   * A JSON string column. Only available in postgres.
+   */
+  JSON: 'JSON',
+
+  /**
    * A virtual value that is not stored in the DB. This could for example be useful if you want to provide a default value in your model
    * that is returned to the user but not stored in the DB.
    * 

lib/model.js

@@ -248,6 +248,7 @@ module.exports = (function() {
     this._booleanAttributes = [];
     this._dateAttributes = [];
     this._hstoreAttributes = [];
+    this._jsonAttributes = [];
     this._virtualAttributes = [];
     this._defaultValues = {};
     this.Instance.prototype.validators = {};
@@ -261,6 +262,8 @@ module.exports = (function() {
         self._dateAttributes.push(name);
       } else if (type === DataTypes.HSTORE) {
         self._hstoreAttributes.push(name);
+      } else if (type === DataTypes.JSON) {
+        self._jsonAttributes.push(name);
       } else if (type === DataTypes.VIRTUAL) {
         self._virtualAttributes.push(name);
       }
@@ -290,6 +293,11 @@ module.exports = (function() {
       return self._hstoreAttributes.indexOf(key) !== -1;
     });
 
+    this._hasJsonAttributes = !!this._jsonAttributes.length;
+    this._isJsonAttribute = Utils._.memoize(function(key) {
+      return self._jsonAttributes.indexOf(key) !== -1;
+    });
+
     this._hasVirtualAttributes = !!this._virtualAttributes.length;
     this._isVirtualAttribute = Utils._.memoize(function(key) {
       return self._virtualAttributes.indexOf(key) !== -1;