Question

我希望在表单中显示错误，并且无法理解为什么此代码不起作用。的 hotel.rb

class Hotel < ActiveRecord::Base
...
  has_many :comments
...
end

comment.rb

class Comment < ActiveRecord::Base
  belongs_to :hotel
  belongs_to :user
  delegate :email, to: :user, prefix: true

  validates :body, presence: true, length: { minimum: 5, maximum:200 }
end

酒店/显示。

...
    %h2 Comments
    #comments
      .ui.piled.blue.segment
        .ui.header
          %i.icon.inverted.circular.blue.comment
          Comments
        .ui.comments
          = render :partial => @hotel.comments
        = render 'comments/form', comment: @hotel.comments
...

_form

-if user_signed_in?
  = simple_form_for [@hotel, Comment.new] do |f|
    =f.error_notification
    %br
    .ui.reply.form
      .field
        =f.label :body, "New comment"
        =f.input :body, as: :text, label: false
        =f.submit 'Add comment', class: "ui fluid blue labeled submit icon button"
-else
  =link_to 'Sign in to add comment', new_user_session_path, class: 'ui blue button'

_comment

= div_for comment do
  .comment
    .content
      %span.author= comment.user_email
      .metadata
        %span.date Posted #{time_ago_in_words(comment.created_at)} ago
    .text
      = comment.body

如果添加了无法更正._ / p>的too_short和too_long模型

更新

comments_controller

class CommentsController < ApplicationController
  def create
    @hotel = Hotel.find(params[:hotel_id])
    @comment = @hotel.comments.new(comment_params)
    @comment.user_id = current_user.id
    @comment.save
    redirect_to @hotel
end

private
  def comment_params
    params.require(:comment).permit(:user_id, :body, :hotel_id)
  end
end

Answer 1

我解决了这个问题。

<强> comments_controller

 def create
    @hotel = Hotel.find(params[:hotel_id])
    @comment = @hotel.comments.new(comment_params)
    @comment.user_id = current_user.id
    @comment.save
    respond_to do |format|
      if @comment.save
        format.html { redirect_to @hotel }
      else
        format.html { render partial: 'comments/form' }
        format.json { render json: @comment.errors, status: :unprocessable_entity }
      end
    end
  end

<强> _form

-if user_signed_in?
  = simple_form_for [@hotel, @comment] do |f|
    - if @comment.errors.any?
      #error_explanation
        %h2
          = pluralize(@comment.errors.count, "error")
          prohibited this comment from being saved:
        %ul
          - @comment.errors.full_messages.each do |msg|
            %li= msg
    %br
    .ui.reply.form
      =f.error_notification
      .inputs
        =f.label :body, "New comment"
        =f.input :body, as: :text, label: false
      .actions
        =f.button :submit, 'Add comment', class: "ui fluid blue labeled submit icon button"
-else
  =link_to 'Sign in to add comment', new_user_session_path, class: 'ui blue button'
%br

当评论没有保存并写入错误时，此代码会呈现评论表单。

Answer 2

您的问题出在您的控制器中。在您尝试保存记录之前，错误不会填充。那么在您的实例中，您没有任何流量控制来查看它是否已保存，您只需@comment.save。如果它不保存或保存，则执行相同的重定向。

试试这个：

  if @comment.save
    redirect_to @hotel, notice: 'Comment was successfully created.'
  else
    redirect_to @hotel, notice: 'There was an issue trying to save your comment.'
  end

现在使用render :new，将填充@comment.errors（假设您尝试了无效长度），现在您应该会看到显示的错误消息！

错误不显示/ Rails，simple_form

2 个答案: