我读过其他相关文章UrlGenerationError似乎指向一个单词的单数或复数，但我认为这不是问题所在。
当我从valuations/_form.html.erb中删除时它起作用：
<%= render "comments/comments" %>
<%= render "comments/form" %>
提交 _form:name & :tag_list, readd
<%= render "comments/comments" %>
<%= render "comments/form" %>
然后刷新。为零时有什么关系？
routes
resources :valuations do
resources :comments
end
评论控制器
class CommentsController < ApplicationController
before_action :load_commentable
before_action :set_comment, only: [:show, :edit, :update, :destroy]
before_action :logged_in_user, only: [:create, :destroy]
def index
@comments = @commentable.comments
end
def new
@comment = @commentable.comments.new
end
def create
@comment = @commentable.comments.new(comment_params)
if @comment.save
@comment.create_activity :create, owner: current_user
redirect_to @commentable, notice: "comment created."
else
render :new
end
end
def edit
@comment = current_user.comments.find(params[:id])
end
def update
@comment = current_user.comments.find(params[:id])
if @comment.update_attributes(comment_params)
redirect_to @commentable, notice: "Comment was updated."
else
render :edit
end
end
def destroy
@comment = current_user.comments.find(params[:id])
@comment.destroy
@comment.create_activity :destroy, owner: current_user
redirect_to @commentable, notice: "comment destroyed."
end
private
def set_comment
@comment = Comment.find(params[:id])
end
def load_commentable
resource, id = request.path.split('/')[1, 2]
@commentable = resource.singularize.classify.constantize.find(id)
end
def comment_params
params.require(:comment).permit(:content, :commentable)
end
end
估值控制器
class ValuationsController < ApplicationController
before_action :set_valuation, only: [:show, :edit, :update, :destroy]
before_action :logged_in_user, only: [:create, :destroy]
def index
if params[:tag]
@valuations = Valuation.tagged_with(params[:tag])
else
@valuations = Valuation.order('RANDOM()')
end
end
def show
@valuation = Valuation.find(params[:id])
@commentable = @valuation
@comments = @commentable.comments
@comment = Comment.new
end
def new
@valuation = current_user.valuations.build
@commentable = @valuation
@comments = @commentable.comments
@comment = Comment.new
end
def edit
end
def create
@valuation = current_user.valuations.build(valuation_params)
if @valuation.save
redirect_to @valuation, notice: 'Value was successfully created'
else
@feed_items = []
render 'pages/home'
end
end
def update
if @valuation.update(valuation_params)
redirect_to @valuation, notice: 'Value was successfully updated'
else
render action: 'edit'
end
end
def destroy
@valuation.destroy
redirect_to valuations_url
end
private
def set_valuation
@valuation = Valuation.find(params[:id])
end
def correct_user
@valuation = current_user.valuations.find_by(id: params[:id])
redirect_to valuations_path, notice: "Not authorized to edit this valuation" if @valuation.nil?
end
def valuation_params
params.require(:valuation).permit(:name, :private_submit, :tag_list, :content, :commentable, :comment)
end
end
评论/_form.html.erb
<%= form_for [@commentable, @comment] do |f| %>
<% if @comment.errors.any? %>
<div class="error_messages">
<h2>Please correct the following errors.</h2>
<ul>
<% @comment.errors.full_messages.each do |msg| %>
<li><%= msg %></li>
<% end %>
</ul>
</div>
<% end %>
<div class="america">
<div class="form-group">
<%= f.text_area :content, rows: 4, class: 'form-control', placeholder: 'Enter Comment' %>
</div>
<div class="america2">
<%= button_tag(type: 'submit', class: "btn") do %>
<span class="glyphicon glyphicon-plus"></span> Comment
<% end %>
</div>
<% end %>
非常感谢您的参与。
当您有这样的嵌套资源时，用于创建评论的 url 看起来像/valuations/123/comments其中 123 是评估的 ID - 如果没有评估 ID，则无法生成此 url。
在您的 Valuations#new 页面上，估价（即@commentable) 是一个未保存的对象，因此它还没有 id，因此会出现有关丢失的错误valuation_id。此外，将一种表单嵌套在另一种表单中是无效的 html，并且会导致奇怪的行为。另一方面，在您的展示页面上，估价确实有一个 ID，因此事情应该按原样进行。
如果您想一次性创建评估及其初始评论，那么您应该使用accepts_nested_attributes_for http://api.rubyonrails.org/classes/ActiveRecord/NestedAttributes/ClassMethods.html#method-i-accepts_nested_attributes_for and fields_for http://guides.rubyonrails.org/form_helpers.html#nested-forms将评论字段添加到您的评估表单中（还有其他方法，但是accepts_nested_attributes_for是内置于 Rails 中的）
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