new method to delete all attachments of a feature

lib/edit/attachmentsStore.js

@@ -104,6 +104,30 @@ define([], function()
 			}
 		}
 
+		this.deleteAttachmentsByFeatureId = function(featureLayerUrl,objectId,callback)
+		{
+			var featureId = featureLayerUrl + "/" + objectId;
+
+			var objectStore = this._db.transaction([OBJECT_STORE_NAME],"readwrite").objectStore(OBJECT_STORE_NAME);
+			var index = objectStore.index("featureId");
+			var keyRange = IDBKeyRange.only(featureId);
+			var deletedCount = 0;
+			index.openKeyCursor(keyRange).onsuccess = function(evt)
+			{
+				var cursor = evt.target.result;
+				if(cursor)
+				{
+					objectStore.delete(cursor.primaryKey);
+					deletedCount++;
+					cursor.continue()
+				}
+				else
+				{
+					callback(deletedCount);
+				}
+			}
+		}
+
 		this.delete = function(attachmentId)
 		{
 			console.assert(false, "not implemented");

lib/edit/offlineFeaturesManager.js

@@ -261,7 +261,6 @@ define([
                         reader.readAsBinaryString(file);
                     };
                 });
-                
             }
 
             layer.deleteAttachments = function(objectId,attachmentsIds,callback,errback){

test/spec/attachmentsStoreSpec.js

@@ -101,6 +101,36 @@ describe("attachments store module", function()
 		});
 	});
 
+	async.it("delete attachments of a single feature", function(done)
+	{
+		g_attachmentsStore.deleteAttachmentsByFeatureId("layer1", 300, function(deletedCount)
+		{
+			expect(deletedCount).toBe(0);
+			setTimeout(function()
+			{
+				g_attachmentsStore.getUsage(function(usage)
+				{
+					expect(usage).not.toBeNull();
+					expect(usage.attachmentCount).toBe(testData.length);
+
+					g_attachmentsStore.deleteAttachmentsByFeatureId("layer1", 1, function(deletedCount)
+					{
+						expect(deletedCount).toBe(2);
+						setTimeout(function()
+						{
+							g_attachmentsStore.getUsage(function(usage)
+							{
+								expect(usage).not.toBeNull();
+								expect(usage.attachmentCount).toBe(testData.length -2);
+								done();
+							})					
+						});
+					});
+				});
+			});
+		});
+	});
+
 	async.it("delete all attachments", function(done)
 	{
 		g_attachmentsStore.deleteAll(function(success)