Question

I have a form which allows a user to invite multiple people via adding emails in a comma separated list. In my "Participant" model, I have a call to validate the uniqueness of the email entered (scoped by "project_id"). In the model validation, it gives a place to explain the error (message), but I can't get that error to show up on my form if the validation fails.

If a user enters the email of a person that has already been added, how can I get the errors message to render?

participant.rb

Application.ScreenUpdating = False

participant_controller.rb

class Participant < ActiveRecord::Base
  validates :email, uniqueness: {case_sensitive: false, scope: :project_id, message: "Looks like you\'ve already added this person."} 
end

form

def new_participant
  @new_participants = Participant.new
  @participants = Participant.where(project_id: @project.id).includes(:user)
  @template = Template.find(@project.template_id)
  @address = Address.where(project_id: @project.id).first
  @food = ProjectRestriction.where(project_id: @project.id)
end

def add_participant
 @added_by = User.find(current_user.id)
 @new_participants = params[:new_participants][:email].split(/,\s*/)
 @new_participants.each do |t|
  newpart = Participant.new(:email => t, :project_id => @project.id, :level => 4, 
          :participant_cat_id => 2,  :last_updated_by => current_user.id, :added_by => current_user.id, :status => 'unseen')
      respond_to do |format|
              if newpart.save
                ProjectMailer.notify_recipient(newpart, @project, @added_by, @participant_invite ).deliver_later
                self.response_body = nil
                redirect_to participants_path(p: @project.id, w: 'recipient')
              else
                format.html { redirect_to new_participant_path(p: @project.id)}
                format.json { render json: @new_participants.errors, status: :unprocessable_entity }
              end
        end
    end
end

Answer 1

您的主要问题是：

您正在为请求中的每封电子邮件创建一个响应块。 1个请求= 1个响应。
@new_participants中存储在内存中的对象实际上并未保存。
在您的观看中，您正在将@new_participants视为单一资源。

在命名路线，变量和操作时要注意多元化。

def add_participants
    @added_by = User.find(current_user.id)
    @new_participants = params[:new_participants][:email].split(/,\s*/)

    @new_participants.map do |email|
        newpart = Participant.new(
                    :email => email, 
                    :project_id => @project.id, 
                    :level => 4, 
                    :participant_cat_id => 2,  
                    :last_updated_by => current_user.id, 
                    :added_by => current_user.id, 
                    :status => 'unseen'
        )
        if newpart.save
            ProjectMailer.notify_recipient(newpart, @project, @added_by, @participant_invite ).deliver_later
        end
        new_part
    end

    @invalid = @new_participants.reject(&:valid?)

    if @invalid.any?
        respond_to do |format|
          format.html { redirect_to new_participant_path(p: @project.id)}
          format.json { render json: @new_participants.map(&:errors), status: :unprocessable_entity }
        end
    else 
        respond_to do |format|
            redirect_to participants_path(p: @project.id, w: 'recipient')
        end
    end
end

<ul>
<% @new_participants.each |p| %> 
    <% p.errors.messages.each do |msg| %>
        <li><%= msg %></li>
    <% end if p.errors.any? %>
<% end %>
</ul>

Model Validation Messages Rails 4 form errors not showing up

1 个答案: