Overwrites #_layout_for in the context object so it supports the case a block is passed to a partial. Returns the contents that are yielded to a layout, given a name or a block.
You can think of a layout as a method that is called with a block. If the
user calls yield :some_name, the block, by default, returns
content_for(:some_name). If the user calls simply
yield, the default block returns
content_for(:layout).
The user can override this default by passing a block to the layout:
# The template <%= render layout: "my_layout" do %> Content <% end %> # The layout <html> <%= yield %> </html>
In this case, instead of the default block, which would return
content_for(:layout), this method returns the block that was
passed in to render :layout, and the response would be
<html> Content </html>
Finally, the block can take block arguments, which can be passed in by
yield:
# The template
<%= render layout: "my_layout" do |customer| %>
Hello <%= customer.name %>
<% end %>
# The layout
<html>
<%= yield Struct.new(:name).new("David") %>
</html>In this case, the layout would receive the block passed into render
:layout, and the struct specified would be passed into the block as
an argument. The result would be
<html> Hello David </html>
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