javascript Rails js.erb 文件找不到方法“渲染”

Rails js.erb file cannot find method "render"

提问by Mike

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

我在 Javascript ERB 文件中有以下代码：

$(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:

当我到达视图时，出现以下错误：

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

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

部分存在，局部变量非零。知道为什么会发生这种情况吗？

Stack trace:

堆栈跟踪：

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 `find_asset'
sprockets (2.0.3) lib/sprockets/base.rb:110:in `[]'
sprockets (2.0.3) lib/sprockets/bundled_asset.rb:200:in `block in build_dependencies_paths_and_assets'
sprockets (2.0.3) lib/sprockets/bundled_asset.rb:194:in `each'
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/trail.rb:102:in `find_asset_in_path'
sprockets (2.0.3) lib/sprockets/base.rb:101:in `find_asset'
sprockets (2.0.3) lib/sprockets/environment.rb:72:in `find_asset'
sprockets (2.0.3) lib/sprockets/base.rb:110:in `[]'
actionpack (3.1.0) lib/sprockets/helpers/rails_helper.rb:124:in `asset_for'
actionpack (3.1.0) lib/sprockets/helpers/rails_helper.rb:28:in `block in javascript_include_tag'
actionpack (3.1.0) lib/sprockets/helpers/rails_helper.rb:27:in `collect'
actionpack (3.1.0) lib/sprockets/helpers/rails_helper.rb:27:in `javascript_include_tag'
app/views/layouts/application.html.haml:7:in `_app_views_layouts_application_html_haml__2778507683501201875_51020080'
actionpack (3.1.0) lib/action_view/template.rb:144:in `block in render'
activesupport (3.1.0) lib/active_support/notifications.rb:55:in `instrument'
actionpack (3.1.0) lib/action_view/template.rb:142:in `render'
actionpack (3.1.0) lib/action_view/renderer/template_renderer.rb:52:in `render_with_layout'
actionpack (3.1.0) lib/action_view/renderer/template_renderer.rb:38:in `render_template'
actionpack (3.1.0) lib/action_view/renderer/template_renderer.rb:12:in `block in render'
actionpack (3.1.0) lib/action_view/renderer/abstract_renderer.rb:22:in `wrap_formats'
actionpack (3.1.0) lib/action_view/renderer/template_renderer.rb:9:in `render'
actionpack (3.1.0) lib/action_view/renderer/renderer.rb:36:in `render_template'
actionpack (3.1.0) lib/action_view/renderer/renderer.rb:17:in `render'
actionpack (3.1.0) lib/abstract_controller/rendering.rb:120:in `_render_template'
actionpack (3.1.0) lib/action_controller/metal/streaming.rb:250:in `_render_template'
actionpack (3.1.0) lib/abstract_controller/rendering.rb:114:in `render_to_body'
actionpack (3.1.0) lib/action_controller/metal/renderers.rb:30:in `render_to_body'
actionpack (3.1.0) lib/action_controller/metal/compatibility.rb:43:in `render_to_body'
actionpack (3.1.0) lib/abstract_controller/rendering.rb:99:in `render'
actionpack (3.1.0) lib/action_controller/metal/rendering.rb:16:in `render'
actionpack (3.1.0) lib/action_controller/metal/instrumentation.rb:40:in `block (2 levels) in render'
activesupport (3.1.0) lib/active_support/core_ext/benchmark.rb:5:in `block in ms'
/home/mike/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/benchmark.rb:310:in `realtime'
activesupport (3.1.0) lib/active_support/core_ext/benchmark.rb:5:in `ms'
actionpack (3.1.0) lib/action_controller/metal/instrumentation.rb:40:in `block in render'
actionpack (3.1.0) lib/action_controller/metal/instrumentation.rb:78:in `cleanup_view_runtime'
activerecord (3.1.0) lib/active_record/railties/controller_runtime.rb:24:in `cleanup_view_runtime'
actionpack (3.1.0) lib/action_controller/metal/instrumentation.rb:39:in `render'
actionpack (3.1.0) lib/action_controller/metal/implicit_render.rb:10:in `default_render'
actionpack (3.1.0) lib/action_controller/metal/implicit_render.rb:5:in `send_action'
actionpack (3.1.0) lib/abstract_controller/base.rb:167:in `process_action'
actionpack (3.1.0) lib/action_controller/metal/rendering.rb:10:in `process_action'
actionpack (3.1.0) lib/abstract_controller/callbacks.rb:18:in `block in process_action'
activesupport (3.1.0) lib/active_support/callbacks.rb:425:in `_run__4540075312289376507__process_action__207230359584297735__callbacks'
activesupport (3.1.0) lib/active_support/callbacks.rb:386:in `_run_process_action_callbacks'
activesupport (3.1.0) lib/active_support/callbacks.rb:81:in `run_callbacks'
actionpack (3.1.0) lib/abstract_controller/callbacks.rb:17:in `process_action'
actionpack (3.1.0) lib/action_controller/metal/rescue.rb:17:in `process_action'
actionpack (3.1.0) lib/action_controller/metal/instrumentation.rb:30:in `block in process_action'
activesupport (3.1.0) lib/active_support/notifications.rb:53:in `block in instrument'
activesupport (3.1.0) lib/active_support/notifications/instrumenter.rb:21:in `instrument'
activesupport (3.1.0) lib/active_support/notifications.rb:53:in `instrument'
actionpack (3.1.0) lib/action_controller/metal/instrumentation.rb:29:in `process_action'
actionpack (3.1.0) lib/action_controller/metal/params_wrapper.rb:201:in `process_action'
activerecord (3.1.0) lib/active_record/railties/controller_runtime.rb:18:in `process_action'
actionpack (3.1.0) lib/abstract_controller/base.rb:121:in `process'
actionpack (3.1.0) lib/abstract_controller/rendering.rb:45:in `process'
actionpack (3.1.0) lib/action_controller/metal.rb:193:in `dispatch'
actionpack (3.1.0) lib/action_controller/metal/rack_delegation.rb:14:in `dispatch'
actionpack (3.1.0) lib/action_controller/metal.rb:236:in `block in action'
actionpack (3.1.0) lib/action_dispatch/routing/route_set.rb:65:in `call'
actionpack (3.1.0) lib/action_dispatch/routing/route_set.rb:65:in `dispatch'
actionpack (3.1.0) lib/action_dispatch/routing/route_set.rb:29:in `call'
rack-mount (0.8.3) lib/rack/mount/route_set.rb:152:in `block in call'
rack-mount (0.8.3) lib/rack/mount/code_generation.rb:96:in `block in recognize'
rack-mount (0.8.3) lib/rack/mount/code_generation.rb:75:in `optimized_each'
rack-mount (0.8.3) lib/rack/mount/code_generation.rb:95:in `recognize'
rack-mount (0.8.3) lib/rack/mount/route_set.rb:141:in `call'
actionpack (3.1.0) lib/action_dispatch/routing/route_set.rb:531:in `call'
warden (1.1.0) lib/warden/manager.rb:35:in `block in call'
warden (1.1.0) lib/warden/manager.rb:34:in `catch'
warden (1.1.0) lib/warden/manager.rb:34:in `call'
actionpack (3.1.0) lib/action_dispatch/middleware/best_standards_support.rb:17:in `call'
rack (1.3.5) lib/rack/etag.rb:23:in `call'
rack (1.3.5) lib/rack/conditionalget.rb:25:in `call'
actionpack (3.1.0) lib/action_dispatch/middleware/head.rb:14:in `call'
actionpack (3.1.0) lib/action_dispatch/middleware/params_parser.rb:21:in `call'
actionpack (3.1.0) lib/action_dispatch/middleware/flash.rb:243:in `call'
rack (1.3.5) lib/rack/session/abstract/id.rb:195:in `context'
rack (1.3.5) lib/rack/session/abstract/id.rb:190:in `call'
actionpack (3.1.0) lib/action_dispatch/middleware/cookies.rb:326:in `call'
activerecord (3.1.0) lib/active_record/query_cache.rb:62:in `call'
activerecord (3.1.0) lib/active_record/connection_adapters/abstract/connection_pool.rb:477:in `call'
actionpack (3.1.0) lib/action_dispatch/middleware/callbacks.rb:29:in `block in call'
activesupport (3.1.0) lib/active_support/callbacks.rb:392:in `_run_call_callbacks'
activesupport (3.1.0) lib/active_support/callbacks.rb:81:in `run_callbacks'
actionpack (3.1.0) lib/action_dispatch/middleware/callbacks.rb:28:in `call'
actionpack (3.1.0) lib/action_dispatch/middleware/reloader.rb:68:in `call'
rack (1.3.5) lib/rack/sendfile.rb:101:in `call'
actionpack (3.1.0) lib/action_dispatch/middleware/remote_ip.rb:48:in `call'
actionpack (3.1.0) lib/action_dispatch/middleware/show_exceptions.rb:47:in `call'
railties (3.1.0) lib/rails/rack/logger.rb:13:in `call'
rack (1.3.5) lib/rack/methodoverride.rb:24:in `call'
rack (1.3.5) lib/rack/runtime.rb:17:in `call'
activesupport (3.1.0) lib/active_support/cache/strategy/local_cache.rb:72:in `call'
rack (1.3.5) lib/rack/lock.rb:15:in `call'
actionpack (3.1.0) lib/action_dispatch/middleware/static.rb:53:in `call'
railties (3.1.0) lib/rails/engine.rb:455:in `call'
railties (3.1.0) lib/rails/rack/content_length.rb:16:in `call'
railties (3.1.0) lib/rails/rack/log_tailer.rb:14:in `call'
rack (1.3.5) lib/rack/handler/webrick.rb:59:in `service'
/home/mike/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/webrick/httpserver.rb:111:in `service'
/home/mike/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/webrick/httpserver.rb:70:in `run'
/home/mike/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/webrick/server.rb:183:in `block in start_thread'

回答by WarHog

You're trying to use renderfrom assets. Unfortunately, it isn't possible now, look at this.

您正在尝试render从资产中使用。不幸的是，现在不可能了，看看这个。

回答by stecb

With the new asset pipeline, inside static assets (/app|lib|vendor/assets/) you can use some 'static' helpers (i.e. <%= asset_path "/foo/bar" %>), because you just compile them once (if you're on production i.e.) and not every time you make an http req. Therefore, it makes no sense to use methods like render(or general 'dynamic' stuff) inside a static asset.

使用新的资产管道，在静态资产 ( /app|lib|vendor/assets/) 中，您可以使用一些“静态”助手（即<%= asset_path "/foo/bar" %>），因为您只需编译一次（如果您在生产中），而不是每次进行 http 请求时。因此，render在静态资产中使用诸如（或一般的“动态”东西）之类的方法是没有意义的。

For your particular case, you could use both *.js.erb views (that will 'match' a particular action inside the controller) or javascript rendered directly inside the html.

对于您的特定情况，您可以使用 *.js.erb 视图（将“匹配”控制器内的特定操作）或直接在 html 内呈现的 javascript。

回答by Nelson Haraguchi

You can't use Rails render. But it's possible to still use partials using Erubis::Eruby rendering directly.

您不能使用 Rails 渲染。但是仍然可以直接使用 Erubis::Eruby 渲染来使用部分。

$(document).ready(function() {
    $("#workout-week").append(<%= escape_javascript(
        Erubis::Eruby.new(File.read(File.join(Rails.root, 'app/views',
        '_show_training_period.html.erb'))).result(period: @period)) %>);
});

Or in Haml

或者在哈姆

$(document).ready(function() {
    $("#workout-week").append(<%= escape_javascript(
        Haml::Engine.new(File.read(File.join(Rails.root, 'app/views',
        '_show_training_period.html.haml'))).render(Object.new, period: @period)) %>);
});

For some reason using ERB breaks the sprocket rendering.
And the binding way to pass locals variables is too ugly.

出于某种原因，使用 ERB 会破坏链轮渲染。
而且传递locals变量的绑定方式也太丑了。

It's a way around, but it's good to remember that using partials inside assets is not recommended. A better way is to place the partial code hidden somewhere in the HTML and use it in your javascripts.

这是一种解决方法，但最好记住，不建议在资产中使用部分。更好的方法是将部分代码隐藏在 HTML 中的某处，并在您的 javascripts 中使用它。