Database Reference
In-Depth Information
User Controller
The
UserController
class contains a method called
Edit
, which takes the
User
object argument. The “Sign-Up” and
“Login” examples use the
GraphStory
object to pass through values. This example demonstrates another way to pass
values into the back-end code (Listing 7-23).
Notice that the
User
object is converted from a JSON string and returns a
User
object as Json. The response could
be used to update the form elements, but because the values are already set within the form there is no need to update
the values. In this case, the application uses the JSON response to let the user know if the update succeeded or not via
a standard JavaScript alert message.
Listing 7-23.
UserController
Edit Method
public JsonResult Edit(User user)
{
user.username = graphstoryUserAuthValue;
graphStoryService.userInterface.update(user);
return Json(User);
}
User Update Method
To complete the update, the
Edit
method calls the update method in
UserService
layer. Because the object being
passed into the update method did nothing more than modify the first and last name of an existing entity, you can use
the
SET
clause via Cypher to update the properties in the graph, as shown in Listing 7-24. This Cypher statement also
uses the
WithParams
clause, which requires an array of parameter objects as its argument, to pass the updated values
to the
SET
clause.
Listing 7-24.
Update Method for a User
public User update(User user)
{
_graphClient.Cypher
.Match(" (user:User {username:{user}} ) ")
.WithParam("user", user.username.ToLower())
.Set("user.firstname = {fn}, user.lastname = {ln} ")
.WithParams(new {fn=user.firstname,ln=user.lastname })
.ExecuteWithoutResults();
return user;
}
■
each of the controllers and the front-end code make use of similar syntax. the next and subsequent sections
will therefore not feature the controller and front-end code and instead focus on the Neo4jClient aspects of the
application. the controllers and front-end code will be referenced, but not listed directly in the following sections.
Note
