字段无效时不显示共享错误消息

Question

我是 Ruby on Rails 的新手，我遇到了表单上不显示错误消息的问题。我已经坚持了好几天了，我已经尝试了几乎所有我看到的关于这个错误的解决方案/建议，但我无法让它发挥作用。我必须填写表格，一份给用户，一份给果岭。他们都使用相同的共享消息部分，并且用户表单在输入无效时会显示错误消息，但绿色表单不会。

Greens 表格（显示在 greenmetrics 视图中）：

<%=form_for(@green) do |f| %>
  <%= render partial: 'shared/error_messages', object: f.object %>
        <div class="form-group">
          <div class="col-xs-2"><legend> Add new metrics:</legend></div>

          <div class="col-xs-2 ">
        <%= f.number_field :number, class: 'form-control', placeholder: "Green number" %>
          </div>
        </div>
        <div class="form-group">
          <div class="col-xs-2 ">
        <%= f.number_field :speed, class: 'form-control', placeholder: "Green speed", :step => 'any' %>
        </div>
        </div>
        <div class="form-group">
          <div class="col-xs-2 ">
        <%= f.number_field :firmness, class: 'form-control',  placeholder: "Green firmness", :step => 'any'  %>
        </div>
        </div>
        <div class="form-group">
          <div class="col-xs-2 ">
        <%= f.date_field :measure_date, class: 'form-control', placeholder: "Date of measurement" %>
        </div>
        </div
        <div class="form-group">
        <div class="col-xs-1 ">
        <%= f.submit "Submit", class: "btn btn-primary" %>
        </div>
        </div

  </div>

<% end %>

用户表单：

<% provide(:title, 'Register') %>
<h1>Sign up</h1>

<div class="row">
  <div class="col-md-6 col-md-offset-3">
    <%= form_for(@user) do |f| %>
      <%= render 'shared/error_messages', object: f.object %>

      <%= f.label :first_name %>
      <%= f.text_field :firstname, class: 'form-control' %>

      <%= f.label :last_name %>
      <%= f.text_field :lastname, class: 'form-control' %>

      <%= f.label :golf_course %>
      <%= f.text_field :golf_course, class: 'form-control' %>

      <%= f.label :email %>
      <%= f.email_field :email, class: 'form-control' %>

      <%= f.label :username %>
      <%= f.text_field :username, class: 'form-control' %>

      <%= f.label :password %>
      <%= f.password_field :password, class: 'form-control' %>

      <%= f.label :password_confirmation, "Password Confirmation" %>
      <%= f.password_field :password_confirmation, class: 'form-control' %>

      <%= f.submit "Create my account", class: "btn btn-primary" %>
        <% end %>
      </div>
    </div>

共享消息部分

<% if object.errors.any? %>
  <div id="error_explanation">
    <div class="alert alert-danger">
      The form contains <%= pluralize(object.errors.count, "error") %>.
    </div>
    <ul>
    <% object.errors.full_messages.each do |msg| %>
      <li><%= msg %></li>
    <% end %>
    </ul>
  </div>
<% end %>

格林模型

    class Green < ActiveRecord::Base
  belongs_to :user
  default_scope -> { order(measure_date: :desc, number: :asc) }
  validates :user_id, presence: true
  validates :number, presence: true 
  validates :speed, presence: true
  validates :firmness, presence: true
  validates :measure_date, presence: true

end

用户模型：

class User < ActiveRecord::Base
  has_many :greens, dependent: :destroy

  before_save { self.username = username.downcase}
  before_save { self.email = email.downcase}
  validates :firstname, presence: true, length: { maximum: 50 }
  validates :lastname, presence: true, length: { maximum: 50 }
  VALID_EMAIL_REGEX = /\A[\w+\-.]+@[a-z\d\-.]+\.[a-z]+\z/i
  validates :email, presence: true, length: { maximum: 255 },
                    format: { with: VALID_EMAIL_REGEX }
                    #,uniqueness: { case_sensitive: false}
  validates :golf_course, presence: true, length: { maximum: 50 }
  validates :username, presence: true, length: { maximum: 25 },
                    uniqueness: { case_sensitive: false}
  has_secure_password
  validates :password, length: {minimum: 6}

   # Returns the hash digest of the given string.
  def User.digest(string)
    cost = ActiveModel::SecurePassword.min_cost ? BCrypt::Engine::MIN_COST :
                                                  BCrypt::Engine.cost
    BCrypt::Password.create(string, cost: cost)
  end

Controller

class UsersController < ApplicationController

  def show
    @user = User.find(params[:id])    
    @greens = @user.greens
  end



    def greenmetrics
        @user = current_user  
        @greens = @user.greens
        @green = current_user.greens.build if logged_in?
end

果岭控制器：

  def create
    @user = current_user
    @green = current_user.greens.build(green_params)
      if @green.save
        flash[:success] = "Green metrics saved!"
        @greens = @user.greens
        redirect_to (:back)
      else
        flash[:danger] = "Please verify that all data is valid"
        redirect_to (:back)
      end   
  end

我不得不添加闪现危险，因为验证中的错误消息没有显示出来......

提前感谢您的帮助。

安德烈亚

Answer 1

新的果岭永远不会有任何错误，因为它尚未经过验证。

Answer 2

我发现出了什么问题，我错过了每个字段作为类的定义：'form-control'。一旦我将它添加到表单并在保存不成功时重新渲染，就会开始显示错误消息。

更新表格：

<%=form_for(@green, :url => greenmetrics_path, :html => {:method => :post}) do |f| %>
  <%= render 'shared/error_messages', object: f.object %>
      <section>
        <div class ="col-xs-2"><legend> Metrics for: </legend> </div>
        <div class ="col-xs-2"><%= f.date_field  :measure_date,  value: @date %></div>
      </section>
     <section>
        <div class="form-group">
          <div class="col-xs-2"><legend> Add metrics:</legend></div>
          <div class="col-xs-2 "> <%= f.number_field :number, placeholder: "Green number", class: 'form-control' %> </div>
          <div class="col-xs-2 "> <%= f.number_field :speed, placeholder: "Green speed", class: 'form-control', :step => 'any' %>  </div>
          <div class="col-xs-2 "> <%= f.number_field :firmness, placeholder: "Green firmness", class: 'form-control', :step => 'any'  %> </div>
          <div class="col-xs-2 "> <%= f.number_field :moisture, placeholder: "Green moisture", class: 'form-control', :step => 'any'  %> </div>
          <div class= "col-xs-1"> <%= f.submit "Add", class: "btn btn-primary" %> </div> 
       </div>
     </section>

<% end %>

更新的控制器：

  def create
    @user = current_user
    @green = current_user.greens.build(green_params)
      if @green.save
        flash[:success] = "Green metrics saved!"
        @greens = @user.greens
        @measure_date = green_params[:measure_date]
        redirect_to greenmetrics_path(:date => @measure_date)
      else
        render 'greenmetrics'
        #flash[:danger] = "Please verify that all data is valid"
        #redirect_to (:back)
      end

  end