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ruby-on-rails-3renderpartialpartials

Render @object and locals vs render :partial

I want to pass a local variable that contains the origin to come on a specific page, this variable contains just a symbol with the value.

When I use this code it works perfect, the origin variable is accessible in the partial :

render :partial => "products", :collection => @products, :locals => {:origin => :gallery}

But when I use this code, the origin is not set and not accessible in the partial :

render @products, :locals => {:origin => :gallery}

What is the difference here? Is the second line of code not render the partial like the first line?

Solution 
  • <%= render @products %>

    Is indeed the shorthand syntax for rendering a partial. But with the shorthand syntax, Rails will ignore the ":locals" variable. There's more on this in the Rails Guides.

    So if you want to pass extra options to the render, you have to specify ":partial => ...". If you want to know why this happens, you can take a look at the Rails source.