Initial commit

lib/assets/javascripts/builder/helpers/query-utils-model.js

@@ -0,0 +1,50 @@
+var _ = require('underscore');
+var Backbone = require('backbone');
+
+var COUNT_SQL_TEMPLATE = 'select count(*) from (<%= subquery %>) st';
+
+module.exports = Backbone.Collection.extend({
+
+  url: function () {
+    return this._configModel.getSqlApiUrl();
+  },
+
+  initialize: function (opts) {
+    opts = opts || {};
+
+    this._subquery = opts.subquery;
+    this._configModel = opts.configModel;
+  },
+
+  fetchCount: function (callback) {
+    var opts = {};
+    var count = -1;
+
+    opts.data = {
+      api_key: this._configModel.get('api_key'),
+      q: this._getCountSQL()
+    };
+    opts.method = this._httpMethod();
+    opts.error = function (coll, resp) {
+      callback && callback(count);
+    };
+    opts.success = function (coll, resp, options) {
+      if (resp.rows && resp.rows.length) {
+        count = resp.rows[0].count;
+      }
+      callback && callback(count);
+    };
+
+    return Backbone.Collection.prototype.fetch.call(this, opts);
+  },
+
+  _getCountSQL: function (excludeColumns) {
+    return _.template(COUNT_SQL_TEMPLATE)({
+      subquery: this._subquery
+    });
+  },
+
+  _httpMethod: function () {
+    return 'GET';
+  }
+});