Pass entire array as local variable into partial, then render another partial with collection

Question

I have a layered partial scheme and am trying to write DRY code. I need to pass a variable into a partial and maintain its array status so that within the partial I can render another partial with the :collection parameter.

on this page I render the 'feed' partial:

 %div.row
    %div.span6
      %h1 Posts 
      /Post feed
      =render 'feed',:locals => {:feed_items => @posts}
    %div.span6
      %h1 Groups
      /Group feed
      =render 'feed', :locals => {:feed_items => @groups}

Here is the 'feed' partial:

%ol
  -if feed_items.first.is_a?(Post)
    =render :partial => 'post_feed_item', :collection => feed_items
  -else
    =render :partial => 'group_feed_item', :collection => feed_items
=will_paginate feed_items

Currently gives me this error:

undefined local variable or method `feed_items' for #<#<Class:0x007fa8e2aa8b00>:0x007fa8e5405390>

UPDATE 1:

real error. final partial doesn't recognize component of the :collection passed to it:

undefined local variable or method `feed_item' for #<#<Class:0x007fa8e2aa8b00>:0x007fa8e2c6d670>

final partial 'post_feed_item'(layer 3?):

%li.feed_item.row-fluid
  %div.image.span3
    =link_to image_tag(feed_item.assets.empty?  ? '/assets/small.png': feed_item.assets.first.image.url(:small), :alt => feed_item.title), post_url(feed_item)

So there is some problem in the first partial...feed_items isn't being parsed as an array?

you need to show the partial where the error is. it looks like you are calling feed_item on one of your post_feed_item or group_feed_item partial which is not right. the convention is the local variable has the same name as the name of that partial — jvnill
– jvnill, Commented Feb 19, 2013 at 1:57
wait, that means I need to make two feed partials. one for groups and one for posts — Brian
– Brian, Commented Feb 19, 2013 at 2:01
no. i think you misundertood. inside post_feed_item, you don't have access to a feed_item, instead you should use post_feed_item. I think you can pass an as option to change the local variable name. render :partial => 'post_feed_item', :collection => feed_items, :as => :feed_item — jvnill
– jvnill, Commented Feb 19, 2013 at 2:06
aHA! That was the issue. I want to blame rails conventions for this, but clearly I should have found that somewhere. Thanks much. Do you want to make a brief answer to this question so I can mark it? — Brian
– Brian, Commented Feb 19, 2013 at 2:13

jvnill · Accepted Answer · 2013-02-19 02:23:19Z

1

calling

= render partial: 'post_feed_item', collection: feed_items

will give you a post_feed_item local variable and not a feed_item variable. either you use that or pass in an as option to set the local variable name.

= render partial: 'post_feed_item', collection: feed_items, as: :feed_item

answered Feb 19, 2013 at 2:23

jvnill

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4 Comments

Linus Over a year ago

How do you pass feed_item as an instance variable?

jvnill Over a year ago

if you already have @feed_item, you can just access it directly in your partial or pass it as a local variable locals: { feed_item: @feed_tiem }

Linus Over a year ago

Sorry my question didn't include the whole question's scale. I have a partial which expects an instance variable and an array with instances which I want to pass to this partial. Example: collection: @items, as: :item where :item should be ‘:@item`. (Last part doesn't work.)

jvnill Over a year ago

post another question in SO :)

Shane Andrade · Accepted Answer · 2013-02-19 01:49:23Z

0

I think you need to render it as a partial:

 %div.row
    %div.span6
      %h1 Posts 
      /Post feed
      =render :partial => 'feed',:locals => {:feed_items => @posts}
    %div.span6
      %h1 Groups
      /Group feed
      =render :partial => 'feed', :locals => {:feed_items => @groups}

answered Feb 19, 2013 at 1:49

Shane Andrade

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6 Comments

Brian Over a year ago

let me give it a shot really quick

Brian Over a year ago

yes, sorry, using your recommendation brings me back to the original issue, which I'd obfuscated with more errors in my quest for a solution. The original issue is that the 2nd layer partial doesn't accept the collection item being passed to it. Check out the edit

Shane Andrade Over a year ago

What's the value of local_assigns[:feed_items] in your feed partial?

Shane Andrade Over a year ago

Yea if you put a debugger statement in your view or just write it out in the HTML.

Brian Over a year ago

gives me two different statements like this: #<ActiveRecord::Relation:0x007fa8e3b61e10>

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