I've got the following code in a Javascript ERB file:

$(document).ready(function() {
  $("#workout-week").append(
    <%= escape_javascript(render :partial => "show_training_period", :locals => { :period => @period }) %>
  );
});

When I got to the view, I get the following error:

undefined method `render' for #<#<Class:0x00000004e21158>:0x00000005dbfe98>

The partial exists, and the local variable is non-nil. Any idea why this might happen?

Stack trace:

app/assets/javascripts/slider.js.erb:2:in `evaluate_source'
tilt (1.3.3) lib/tilt/template.rb:209:in `instance_eval'
tilt (1.3.3) lib/tilt/template.rb:209:in `evaluate_source'
tilt (1.3.3) lib/tilt/template.rb:144:in `cached_evaluate'
tilt (1.3.3) lib/tilt/template.rb:127:in `evaluate'
tilt (1.3.3) lib/tilt/template.rb:76:in `render'
sprockets (2.0.3) lib/sprockets/context.rb:175:in `block in evaluate'
sprockets (2.0.3) lib/sprockets/context.rb:172:in `each'
sprockets (2.0.3) lib/sprockets/context.rb:172:in `evaluate'
sprockets (2.0.3) lib/sprockets/bundled_asset.rb:171:in `build_dependency_context_and_body'
sprockets (2.0.3) lib/sprockets/bundled_asset.rb:135:in `dependency_context'
sprockets (2.0.3) lib/sprockets/bundled_asset.rb:194:in `build_dependencies_paths_and_assets'
sprockets (2.0.3) lib/sprockets/bundled_asset.rb:141:in `dependency_paths'
sprockets (2.0.3) lib/sprockets/bundled_asset.rb:61:in `mtime'
sprockets (2.0.3) lib/sprockets/asset.rb:58:in `block in encode_with'
sprockets (2.0.3) lib/sprockets/asset.rb:57:in `each'
sprockets (2.0.3) lib/sprockets/asset.rb:57:in `encode_with'
sprockets (2.0.3) lib/sprockets/bundled_asset.rb:43:in `encode_with'
sprockets (2.0.3) lib/sprockets/caching.rb:52:in `cache_asset'
sprockets (2.0.3) lib/sprockets/environment.rb:82:in `build_asset'
sprockets (2.0.3) lib/sprockets/base.rb:99:in `find_asset'
sprockets (2.0.3) lib/sprockets/environment.rb:72:in
javascript ruby-on-rails ruby erb
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