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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

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