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Could anyone give clear explanation on how provide() works inside the view ? I have read official documentation but what really bothers me is this, if I define in the beginning of a template
<% provide(:title, 'Help') %>
and then later I have this line of code
<%= yield :title %>
what really happens in the background ? I know that yield is supposed to call code block. What would be code block in this context?
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2.2. By default, if you use the :plain option, the text is rendered without using the current layout. If you want Rails to put the text into the current layout, you need to add the layout: true option and use the . text. erb extension for the layout file.
Rails Guides describes partials this way: Partial templates - usually just called "partials" - are another device for breaking the rendering process into more manageable chunks. With a partial, you can move the code for rendering a particular piece of a response to its own file.
The content_for method allows us to insert content into a named yield block in our layout. For example, this view would work with the layout that we just saw: <% content_for :head do %> <title>A simple page</title> <% end %> <p>Hello, Rails!</
provide stores a block of markup in an identifier for later use. In this case, 'Help' in the symbol :title. The provide is enclosed in <% %> to indicate it is executing this code and not printing out in the view.
yield in this case just spits that block back out. The yield is enclosed in <%= %> to indicate it is being printed out into the view.
Think of it as setting a variable and printing out a variable.
See: http://api.rubyonrails.org/classes/ActionView/Helpers/CaptureHelper.html#method-i-provide
for more information. Note that provide is really a wrapper for content_for so that's where the good stuff is in that link.
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