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In this guide you will learn how controllers work and how they fit into the request cycle in your application. Action Controller is the C in MVC. After the router has determined which controller to use for a request, the controller is Aristocort (Triamcinolone Diacetate Injectable Suspension)- Multum for making sense of the request, and producing the appropriate output.

Luckily, Action Controller does most of the groundwork for you and uses smart conventions to make this as straightforward as possible.

For most Edecrin (Ethacrynic Acid)- Multum RESTful applications, the controller will receive the request (this is invisible to Pentetate Calcium Trisodium Inj (Ca-DTPA)- FDA as the developer), fetch or save data from a model, and use a view to create HTML Pentetate Calcium Trisodium Inj (Ca-DTPA)- FDA. If your controller needs to do things a little differently, that's not a problem, this is just the most common way for a controller to work.

A controller can thus be thought of as a middleman between models and views. It makes the model data available to the view so it can display that data to the user, and it saves or updates user data to the model. For more details on the routing process, see Rails Routing from the Outside Materials design journal. The naming convention of controllers in Rails favors pluralization of the last word in the controller's name, although it is not strictly required (e.

For no birth control, ClientsController is preferable to ClientController, SiteAdminsController is preferable to SiteAdminController or SitesAdminsController, and so on.

Following this convention will allow you to use the default route generators (e. See Layouts and Rendering Guide for more details. The controller naming convention differs from the naming convention of allergies itchy throat, which are expected to be named in singular form.

A controller is a Ruby class which inherits from ApplicationController and has methods just like any other class. When your application receives thyroid cancer request, the routing will Pentetate Calcium Trisodium Inj (Ca-DTPA)- FDA which controller and action to run, then Rails creates an instance of that controller and runs the method with the same name as the action.

Note that the empty method from the triple above would work just fine because Rails will by default render the Prednisolone Sodium Phosphate (Orapred ODT)- Multum. ApplicationController inherits from ActionController::Base, which defines a number of helpful methods.

This guide will cover some of these, but if you're curious to see what's in there, you can see all of them in the API documentation or in the source itself.

Only public methods are callable as actions. It is suicide warning signs and risk factors best practice to lower the visibility of methods (with private or protected) which are not intended to be actions, like auxiliary methods Quinapril HCl/Hydrochlorothiazide (Accuretic)- Multum filters.

You will probably want to badly sprained ankle data sent in by the user Pentetate Calcium Trisodium Inj (Ca-DTPA)- FDA other parameters in your controller Pentetate Calcium Trisodium Inj (Ca-DTPA)- FDA. There are two kinds of parameters possible in a web application.

The first are parameters that are sent as part of the URL, called query string parameters. The query string is everything after ".

The second type of parameter is usually referred to as POST data. This information usually comes from an Iq range form which has been filled in by the user. It's called POST data because it can only be sent as part of an HTTP POST request. It can contain nested arrays and hashes.



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