[#217,backend/ckan][s]: support for sorting (plus refactor to have a normalizeQuery method).

src/backend.ckan.js

@@ -37,14 +37,26 @@ this.recline.Backend.Ckan = this.recline.Backend.Ckan || {};
     return dfd.promise();
   };
 
-  my.query = function(queryObj, dataset) {
-    var wrapper = my.DataStore();
+  // only put in the module namespace so we can access for tests!
+  my._normalizeQuery = function(queryObj, dataset) {
     var actualQuery = {
       resource_id: dataset.id,
       q: queryObj.q,
-      limit: queryObj.size,
-      offset: queryObj.from
+      limit: queryObj.size || 10,
+      offset: queryObj.from || 0
     };
+    if (queryObj.sort && queryObj.sort.length > 0) {
+      var _tmp = _.map(queryObj.sort, function(sortObj) {
+        return sortObj.field + ' ' + (sortObj.order || '');
+      });
+      actualQuery.sort = _tmp.join(',');
+    }
+    return actualQuery;
+  }
+
+  my.query = function(queryObj, dataset) {
+    var actualQuery = my._normalizeQuery(queryObj, dataset);
+    var wrapper = my.DataStore();
     var dfd = $.Deferred();
     var jqxhr = wrapper.search(actualQuery);
     jqxhr.done(function(results) {

test/backend.ckan.test.js

@@ -1,6 +1,31 @@
 (function ($) {
 module("Backend CKAN");
 
+test('_normalizeQuery', function() {
+  var dataset = new recline.Model.Dataset({
+    url: 'does-not-matter',
+    id: 'xyz',
+    backend: 'ckan'
+  });
+
+  var queryObj = {
+    q: 'abc',
+    sort: [
+      { field: 'location', order: 'desc' },
+      { field: 'last' }
+    ]
+  };
+  var out = recline.Backend.Ckan._normalizeQuery(queryObj, dataset);
+  var exp = {
+    resource_id: dataset.id,
+    q: 'abc',
+    sort: 'location desc,last ',
+    limit: 10,
+    offset: 0
+  };
+  deepEqual(out, exp);
+});
+
 test("fetch", function() { 
   var dataset = new recline.Model.Dataset({
     url: 'http://localhost:5000/dataset/test-data-viewer/resource/4f1299ab-a100-4e5f-ba81-e6d234a2f3bd',