Eliminate unnecessary fetch calls for search results

This patch eliminates the need to perform additional fetch calls for Board
and Organization results by altering the fields returned for results.
For Member results this patch drops fields that are unused in the
Member.from_json call like avatarHash and confirmed.

trello/trelloclient.py

@@ -301,6 +301,11 @@ def search(self, query, partial_match=False, models=[],
         if card_ids:
             query_params['idCards'] = card_ids
 
+        # Request result fields required to instantiate class objects
+        query_params['board_fields'] = ['name,url,desc,closed']
+        query_params['member_fields'] = ['fullName,initials,username']
+        query_params['organization_fields'] = ['name,url,desc']
+
         json_obj = self.fetch_json('/search', query_params=query_params)
         if not json_obj:
             return []
@@ -311,15 +316,18 @@ def search(self, query, partial_match=False, models=[],
         for board_json in json_obj.get('boards', []):
             # Cache board objects
             if board_json['id'] not in board_cache:
-                board_cache[board_json['id']] = Board(self, board_json['id'])
-                board_cache[board_json['id']].fetch()
+                board_cache[board_json['id']] = Board.from_json(
+                    self, json_obj=board_json)
             results.append(board_cache[board_json['id']])
 
         for card_json in json_obj.get('cards', []):
             # Cache board objects
             if card_json['idBoard'] not in board_cache:
                 board_cache[card_json['idBoard']] = Board(
                     self, card_json['idBoard'])
+                # Fetch the board attributes as the Board object created
+                # from the card initially result lacks a URL and name.
+                # This Board will be stored in Card.parent
                 board_cache[card_json['idBoard']].fetch()
             results.append(Card.from_json(board_cache[card_json['idBoard']],
                                           card_json))
@@ -328,8 +336,7 @@ def search(self, query, partial_match=False, models=[],
             results.append(Member.from_json(self, member_json))
 
         for org_json in json_obj.get('organizations', []):
-            org = Organization(self, org_json['id'])
-            org.fetch()
+            org = Organization.from_json(self, org_json)
             results.append(org)
 
         return results