Render partial :collection => @array specify variable name

The documentation at http://guides.rubyonrails.org/layouts_and_rendering.html says:

When a partial is called with a pluralized collection, then the individual instances of the partial have access to the member of the collection being rendered via a variable named after the partial.

So it will be passed a variable called "contact_tile" instead of "contact". Perhaps you can just rename your partial.

If this naming is important, you could do it explicitly without the collection option by something like:

@contacts.each { |contact| render :partial => 'contacts/contact_tile', :locals => {:contact => contact } }

(although as a commenter pointed out, this may not be as performant)

Latest syntax are :

index.html.erb

<%= render partial: "product", collection: @products %>

_product.html.erb

<p>Product Name: <%= product.name %></p>

@products is used in partial as product

Where @products can be considered as Product.all and product can be considered as a row of product i.e. Product.first as looped all product one by one.

Found this is also helpful from the docs. You aren't limited to having the variable named after the partial:

http://guides.rubyonrails.org/layouts_and_rendering.html

To use a custom local variable name within the partial, specify the :as option in the call to the partial:

<%= render :partial => "product", :collection => @products, :as => :item %>

With this change, you can access an instance of the @products collection as the item local variable within the partial."