Rails在单行块内部渲染部分

Question

I've got a feed of information that I want to simplify by using some partials. Basically, I want to do something along the lines of

<%= 2.times { |j| render 'item_expanded', item: @social_json_feed[i + j], index: (i + j) } %>

However, the above code does not render the partial. Instead, it returns the value "2" two times. If I write the block as a do-end block it works as one would expect.

<% 2.times do |j| %>
  <%= render 'item_expanded', item: @social_json_feed[i + j], index: (i + j) %>
<% end %>

Produces the partial in the way I want. But if the do-end block works correctly a one-line block should be able to work correctly as well, right? Is it simply something about how the one-line block is formatted or is it something deeper into Rails magic? Also, why does the first example of code return "2" twice??

Answer 1

It's because in first case it renders only return value of 2.times method call, which is 2 . You should simply use the second notation.

Answer 2

如果您向map添加调用，则应该能够将其全部保存在一行中。

<%= 2.times.map { |j| render 'item_expanded', item: @social_json_feed[i + j], index: (i + j) } %>