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这是一个新手问题，但我仍在学习如何在 Rails 中的两个模型之间创建关联。我有一个用户模型和一个 journal_entry 模型。日记条目属于用户并且用户有_many 日记条目。我创建了如下所示的迁移：

class AddJournalEntriesToUsers < ActiveRecord::Migration
  def change    
    add_column :journal_entries, :user_id, :integer
  end
end

class AddIndexToJournalEntries < ActiveRecord::Migration
  def change
    add_index :journal_entries, [:user_id, :created_at]
  end
end

这是我的用户模型的样子：

class User < ActiveRecord::Base
  authenticates_with_sorcery!

  attr_accessible :email, :password, :password_confirmation

  has_many :journal_entries, dependent: :destroy

  validates_confirmation_of :password, :message => "should match confirmation", :if => :password
  validates_length_of :password, :minimum => 3, :message => "password must be at least 3 characters long", :if => :password
  validates_presence_of :password, :on => :create
  validates_presence_of :email
  validates_uniqueness_of :email

end

这是我的 journal_entry 模型的样子：

class JournalEntry < ActiveRecord::Base
  attr_accessible :post, :title, :user_id

  belongs_to :user

  validates :user_id, presence: true

  default_scope order: 'journal_entries.created_at DESC'
end

但是当我去创建一个新的日记帐分录时，/journal_entries/new我只是一个验证错误，上面写着“用户不能为空”。因此，即使我已登录并且我的 db/schema.rb 中有一个 user_id 列，user_id 也不会添加到日志条目中：

create_table "journal_entries", :force => true do |t|
    t.string   "title"
    t.text     "post"
    t.datetime "created_at", :null => false
    t.datetime "updated_at", :null => false
    t.integer  "user_id"
  end

此外，这是我在 journal_entries/new 上用来创建日记条目的表单：

<%= form_for(@journal_entry) do |f| %>
  <% if @journal_entry.errors.any? %>
    <div id="error_explanation">
      <h2><%= pluralize(@journal_entry.errors.count, "error") %> prohibited this journal_entry from being saved:</h2>

      <ul>
      <% @journal_entry.errors.full_messages.each do |msg| %>
        <li><%= msg %></li>
      <% end %>
      </ul>
    </div>
  <% end %>

  <div class="field">
    <%= f.label :title %><br />
    <%= f.text_field :title %>
  </div>
  <div class="field">
    <%= f.label :post %><br />
    <%= f.text_area :post %>
  </div>
  <div class="actions">
    <%= f.submit %>
  </div>
<% end %>

What am I missing here? Do I need to add the user_id as a hidden field on the form?

4

5 回答 5

3

i bet, that u forget something like 

def create
    @journal_entry = @user.journal_entries.build(params[:journal_entry])
    # @journal_entry = current_user.journal_entries.build(params[:journal_entry])
    if @journal_entry.save
    ..
于 2012-07-06T22:26:35.173 回答
2

journal_entry model should look like

class JournalEntry < ActiveRecord::Base
  attr_accessible :post, :title, :user_id
  belongs_to :user
  validates :user_id, presence: true
  default_scope order: 'journal_entries.created_at DESC'
end

This should work!

于 2012-07-06T03:40:57.517 回答
0

You need to add user_id to your attr_accessible call, if you look at your logs it is probably warning you that it can't mass assign it.

于 2012-07-06T01:39:42.693 回答
0

Ok, so I got this working by adding the user to the create action in my journal_entries_controller.rb. Here's the code I used, but is this the "rails way" to do this?

def create
  @user = current_user
  @journal_entry = @user.journal_entries.build(params[:journal_entry])
  if @journal_entry.save
    flash[:success] = "Journal entry created!" 
  end
end
于 2012-07-07T16:09:15.540 回答
0

you have it right this time. You added the user association to the journal model which loads the user in the controller before displaying it in the view. You do need the hidden fields in your form which you added, since you are using a stateless protocol. On the update/create action, double check that the user posting is the user using and save.

于 2012-07-07T16:17:51.560 回答