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The Controller
1:47The controller is responsible for handling the browser request. It CONTROLS the model and the view to generate a response.
This section of the log shows where
Rails proceed to get requests for
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the posts path.
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The request gets sent to the index
method of the PostsController class.
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The controller is responsible for
handling the browser requests.
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It controls the model and
the view to generate a response.
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The controller receives the request,
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loads the requested data via
the model usually from a database.
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And then inserts that data into the view,
which is usually an HTML page.
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The result of rendering the HTML is then
returned to the browser as a response.
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Most of the code for
your app including controllers, models and
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views will reside within
the app sub directory.
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Rails create source files for controller
classes in the app controllers directory.
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Here's the PostController class,
in posts_controller.rb.
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And here's the index method or action.
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Controller methods that respond to
requests are sometimes called actions.
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Doesn't look like much, but
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that's because it's mostly using the
default operations to handle the request.
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First, it loads some data
via the Post model class.
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It calls the Post.all method
to load all post objects and
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stores them in an instance variable.
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Then the controller uses the data in
that instance variable to render a view.
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By default it renders a template
with the same name as the action
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within the same page layout
the rest of the application uses.
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We could add an explicit call to
the render method and get the same result.
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We could render the posts/index
template using a layout of application.
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If we save this and then reload the page
in our browser, we'll get the same result.
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So the controller loads model
data by calling Post.all and
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then it renders the index view.
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Next, we'll look at that model and
view in more detail.
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