Rails 4.0参数丢失或值为空 [英] Rails 4.0 param is missing or the value is empty

问题描述

我有一个带有嵌套资源链接的机会模型.在我的视图/机会/显示页面中，当我单击其中一个链接的"DestroY"时，出现错误:

I have an Opportunity model that has a nested resource Link. In my views/opportunities/show page when I click on "DestroY' for one of the links, I get the error:

参数丢失或值为空:链接

param is missing or the value is empty: link

它抱怨的代码段是:

def link_params
     params.require(:link).permit(:description, :link_url)
end

这是我的销毁代码:

def destroy
  @opportunity = Opportunity.find(params[:opportunity_id])
  @link = @opportunity.links.find(link_params)
  @link.destroy
  respond_to do |format|
    format.html { redirect_to links_url, notice: 'Link was successfully destroyed.' }
    format.json { head :no_content }
end

推荐答案

更改此项:

 @link = @opportunity.links.find(link_params)

对此:

 @link = @opportunity.links.find(params[:id])

您的参数中没有link，只有id和opportunity_id.

You don't have a link in your params, you just have an id and an opportunity_id.

另外，你有这个:

respond_to do |format|
   format.html { redirect_to links_url, notice: 'Link was successfully destroyed.' }
...
end

我猜您在opportunities中嵌套了links资源.因此没有links_url.您需要使用opportunities_links_url(@opportunity).

I'm guessing you have your links resource nested inside opportunities. So there is no links_url. You need to use, i.e., opportunities_links_url(@opportunity).

最后，请注意，除非您在此实例中明确需要绝对URL，否则可能需要opportunities_links_path而不是opportunities_links_url.

Finally, note that you probably want opportunities_links_path rather than opportunities_links_url unless you explicitly need absolute URLs in this instance.

您可以通过运行rake routes找到链接帮助器.可以使用最后端的_url或_path调用最左边的"prefix"列中的所有内容以生成URL.

You can discover your link helper by running rake routes. Everything in the leftmost "prefix" column can be called with _url or _path on the end to generate a url.

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