Question

NoMethodError in Valuations#show
undefined method `each' for #<Valuation:0x007fb6e9a62c08>
Line: <% @valuation.each do |valuation| %>

我们应该如何在控制器中定义它，以便用户能够＆＃34;喜欢＆＃34;显示页面中的估价值？

控制器

def show
  @valuation = Valuation.find(params[:id])
  @commentable = @valuation
  @comments = @commentable.comments
  @comment = Comment.new
end

def like
  @valuation = Valuation.find(params[:id])
  @valuation_like = current_user.valuation_likes.build(valuation: @valuation)
  if @valuation_like.save
    @valuation.increment!(:likes)
    flash[:success] = 'Thanks for liking!'
  else
    flash[:error] = 'Two many likes'
  end  
    redirect_to(:back)
end

喜欢显示：

<% @valuation.each do |valuation| %>
    <%= pluralize(valuation.likes, 'like') %>
  <%= link_to content_tag(:span, '', class: 'glyphicon glyphicon-thumbs-up') + 
        ' Like it', like_valuation_path(:id => valuation.id), method: :post %>
    <% valuation.likers.each do |user| %>
     <%= user.name %>
    <% end %>
<% end %>

有估值和valu_like 模型。

class ValuationLike < ActiveRecord::Base
  belongs_to :valuation
  belongs_to :user
  validates :user, uniqueness: { scope: :valuation }
  belongs_to :liker, class_name: 'User', foreign_key: :user_id
  belongs_to :liked_comment, class_name: 'Valuation', foreign_key: :valuation_id
end

class Valuation < ActiveRecord::Base
  has_many :valuation_likes 
  has_many :likers, through: :valuation_likes, class_name: 'User', source: :liker
end

Answer 1

您正在尝试迭代单个项目，find方法返回1 Valuation个对象，或者在找不到它时抛出：

@valuation = Valuation.find(params[:id])

所以当你尝试这样做时：

<% @valuation.each do |valuation| %>

解释器生气，单Valuation没有each方法，因为此警告告诉您：

undefined method `each' for #<Valuation:0x007fb6e9a62c08>

因此，不要迭代@valuation对象，只需使用它：

<%= pluralize(@valuation.likes, 'like') %>
<%= link_to content_tag(:span, '', class: 'glyphicon glyphicon-thumbs-up') + 
            ' Like it', like_valuation_path(:id => @valuation.id), method: :post %>
<% @valuation.likers.each do |user| %>
  <%= user.name %>
<% end %>

你可以避免在你的观点中使用content_tag（这更像是帮助者）。 link_to函数可以对其内容进行处理，因此请尝试以下方法：

<%= pluralize(@valuation.likes, 'like') %>
<%= link_to like_valuation_path(:id => @valuation.id), method: :post do %>
  <span class='glyphicon glyphicon-thumbs-up'></span> Like it
<% end %>
<% @valuation.likers.each do |user| %>
  <%= user.name %>
<% end %>

如何＆＃34;喜欢＆＃34;在Show Page？ [错误]

1 个答案: