This allows you to use the same format for links in views and controllers. Namespace link_to,; link_to_if,; link_to_unless,; link_to_unless_current. M. mail_to. Hi, I can’t seem to find how to define the format in my links. My link looks like this now: link_to ‘Show’, resource_path(@resource) %> But. Sometimes you want to add a format such to an url/path helper. It easy just do.

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Objective Learn how to display a selected article in the article show page. Steps Step 1 Add the ‘Show’ link to each article in the index page. The hyperlink text will be ‘Show’.

When the user clicks the ‘Show’ link we need to go the articles controller, show action. We will retrieve link_tp record from the database and display it in the view. What should be the url helper?

link_to (ActionView::Helpers::UrlHelper) – APIdock

You can view the output of ljnk_to routes to find the url helper to use in the view. In this case we know the resource end point. We go from the right most column to the left most column and find the url helper under the Prefix column. Look at the output of rake routes command.


You can see in the URI pattern column the: You can see the generated string is the same as the URI pattern in the output of the rake routes command.

We can simplify it even further by letting Rails call the id method for us by just passing the article object.

Experimenting in Rails console to check the generated URI for a given article resource. Reload the articles index page http: You will see the show link. Since this is a hyperlink the browser will use formmat http verb GET when the user clicks on show.

In this case the value of: Rails will automatically populate the params hash with: We can retrieve the value of the primary key from the params hash and load the record from the formt.

As we saw in the previous step, we can get the primary key from the params hash. So, define the show action in the articles controller as follows:. We need a view to display the selected article. Since the article variable was initialized in the show action, we can retrieve the values of the columns for this particular record and display it in the view.

  ASTM D1140 PDF

Now the ‘Show’ link will work.

Table of Contents

In this lesson we saw how to display a selected article fformat the show page. In the next lesson we will see how to delete a given record from the database.

No template found for ArticlesController show, rendering head: Create your own user feedback survey. You can unsubsribe anytime. We’ll never share your email.