Adding support for populate. Closes #6

Author: ekryski

src/index.js

@@ -23,14 +23,16 @@ export default function(query, paginate) {
     $sort: query.$sort,
     $limit: getLimit(parse(query.$limit), paginate),
     $skip: parse(query.$skip),
-    $select: query.$select
+    $select: query.$select,
+    $populate: query.$populate
   };
 
   // Remove the params from the query's conditions.
   delete query.$sort;
   delete query.$limit;
   delete query.$skip;
   delete query.$select;
+  delete query.$populate;
 
   return filters;
 }

test/index.test.js

@@ -115,4 +115,26 @@ describe('Feathers Query Filters', function() {
       expect(result.$select).to.be.undefined;
     });
   });
+
+  describe('$populate', function() {
+    beforeEach(function() {
+      this.query = { $populate: 1 };
+    });
+
+    it('returns $populate when present in query', function() {
+      var result = filter(this.query);
+      expect(result.$populate).to.equal(1);
+    });
+
+    it('removes $populate from query when present', function() {
+      filter(this.query);
+      expect(this.query).to.deep.equal({});
+    });
+
+    it('returns undefined when not present in query', function() {
+      var query = { $foo: 1 };
+      var result = filter(query);
+      expect(result.$populate).to.be.undefined;
+    });
+  });
 });