link_to 调用的函数，即使在硬编码时也不起作用 [英] Function called by link_to, doesn't work even when hard coded

问题描述

出于某种原因，在我的函数 make_feed_preference 中，@user.feed_preference 永远不会改变，即使我将其硬编码为 @user.feed_preference = "foob​​ar" 但看起来 redirect_to 'posts' 工作正常.

For some reason, in my function make_feed_preference, the @user.feed_preference never changes, even if I hard code it to @user.feed_preference = "foobar" but it looks like redirect_to 'posts' is working fine.

错误是即使在按下 link_to 之后 feed_preference 总是 nil，所以 (if feed_preference ==nil) 总是 true.我仍然不知道是什么原因造成的.

The bug is that the feed_preference is always nil even after the link_to is pressed, so the (if feed_preference == nil) is always true. I still don't know what's causing this.

make_feed_preference 存储在 users_controller 中.它的作用是显示新闻提要，但根据偏好值(例如，时间"、趋势值"、关注者")进行排序

make_feed_preference is stored in the users_controller. What it does is shows a news feed, but sorted according to a preference value (e.g., "time", "trending_value", "followers")

<%= link_to displayIcon(1), {:action => :make_feed_preference, :id => current_user.id, :preference => "trending value",  :controller => "users"}, :method => :post %>

<小时>

def make_feed_preference
  @user = User.find(params[:id])
  @user.feed_preference = params[:preference]

  @user.save

  redirect_to '/posts'
end

<小时>

注意:我通过向用户附加一个新类来修复它.

---

Note: i fixed it by attaching a new class to the users.

推荐答案

我会在这里使用条件:

redirect_to '/posts', :notice => if @user.save
    'You have updated your feed preference.'
else
    'Your input was invalid.'
end

您会发现@user 验证可能失败了.

You'll find that the @user validations are probably failing.

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