AssetTagHelper :: image_path外部视图 [英] AssetTagHelper::image_path outside views

问题描述

据推测，ActionController::Base.helpers的作用类似于访问外部视图中的帮助器的代理.但是，在那里定义的许多方法都依赖于控制器变量，而我无法成功调用:

Supposedly, ActionController::Base.helpers acts like a proxy for accessing helpers outside views. However many of the methods defined there rely on controller variables and I'm unable to succesfully call:

ActionController::Base.helpers.image_path("my_image.png")
>> TypeError Exception: can't convert nil into String

从源头开始挖掘，我看到compute_asset_host方法正在尝试访问config.asset_host，但是config是nil.

Digging at the source I see compute_asset_host method is trying to access config.asset_host but config is nil.

如何从外部视图成功调用image_path?

How can I successfully call image_path from outside views?

推荐答案

使用view_context访问视图中可用的那些辅助方法.

Use view_context to access those helper methods that are available in the view.

您可以像这样从控制器调用image_path.

You can call image_path like this from the controller.

view_context.image_path "my_image.png"

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