Rails 4 partial locals undefined variable error

Question

I am rendering a bunch of tables with a graph, all the same type of data repeated a number of times so I wanted to use a partial for DRY code purposes.

This is the code I call in the view:

  <%= render 'app_usage', locals: {
    metric: "Sessions", 
    new_total: @flurry_total, 
    old_total: @flurry_old_total, 
    growth: flurry_growth,
    chart_data: flurry_chart
    } %>

and in _app_usage.html.erb

<div class="col-sm-12">
  <table class="table table-striped table-condensed">
    <tbody>
      <tr><td>Metric:</td><td><%= metric %></td></tr>
...

However I get an error for the <tr><td>Metric:</td><td><%= metric %></td></tr> saying the variable metric is undefined. Why is that?

sjagr · Accepted Answer · 2015-08-24 19:46:36Z

2

You need to use the partial syntax to invoke the ActionView::PartialRenderer with locals:

<%= render partial: 'app_usage', locals: {
    metric: "Sessions", 
    new_total: @flurry_total, 
    old_total: @flurry_old_total, 
    growth: flurry_growth,
    chart_data: flurry_chart
    } %>

edited Aug 24, 2015 at 19:46

answered Aug 24, 2015 at 19:35

sjagr

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4 Comments

Arup Rakshit Over a year ago

He he yes... I missed it.

Arup Rakshit Over a year ago

But without partial syntax how Rails reach to the partial is making me crazy if I follow OP...

sjagr Over a year ago

@ArupRakshit You can invoke a partial if you're not looking to pass your own layout or locals using the regular render syntax. See "Rendering the default case" from the link in my answer :)

Arup Rakshit Over a year ago

Well, I read it. Then I think OP;s code will work without locals: {}.. OP needs to pass those key/values as arguments.....

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