Question

我有3个相关对象：Group，Cipher，User。密码既属于组又属于用户。用户也直接属于一个组。

群组的“显示”视图显示包含所有密码的群组。我希望显示拥有每个密码的用户的名字，但它会引发错误undefined method 'first_name' for #<Group:0x007fa3f4a038a0>

这是Show view extract：

    <table class="table table-striped table-condensed">
      <tr align="left">
        <th><%= t('Cipher') %></th>
        <th><%= t('User') %></th>
        <th><%= t('EndOfLife') %></th>
        <th><%= t('UpdatedBy') %></th>
        <th><%= t('UpdatedAt') %></th>
      </tr>

      <% @group.ciphers.order("updated_at").each do |child_object| %>
      <tr align="left">
        <td valign="top"> <%=child_object.key%> </td>
        <td valign="top"> <%=child_object.user.first_name%> </td>
        <td valign="top"> <%=child_object.valid_until%> </td>
        <td valign="top"> <%=child_object.updated_by%> </td>
        <td valign="top"> <%=child_object.updated_at%> </td>
      </tr>
      <% end%>
    </table>
  </div>

以下是群组模型：

class Group < ApplicationRecord
  has_many :users
  has_many :ciphers, :inverse_of => :user, :dependent => :destroy
  accepts_nested_attributes_for :ciphers, :reject_if => :all_blank, :allow_destroy => true

以下是密码模型：

class Cipher < ApplicationRecord
  #Filters
  before_save { self.cipher_hash = (BCrypt::Password.create(key+group.name)).split(//).last(32).join }

  #Validations
  validates :key, :valid_until, :group_id, :user_id, presence: true
  validates :key, length: {maximum: 100}

  #Relations
  belongs_to :group
  belongs_to :user
end

以下是用户模型：

class User < ApplicationRecord

  # Include default devise modules. Others available are:
  # :confirmable, :lockable, :timeoutable and :omniauthable
  devise :database_authenticatable, :registerable,
         :recoverable, :rememberable, :trackable, :validatable, :confirmable, :lockable, :zxcvbnable

  #Filters
  before_save { self.email = email.downcase }

  #Validations
  validates :name, :first_name, :group_id, presence: true, length: {maximum: 100}

  #Relations
  belongs_to :group
  has_many :ciphers
end

感谢您的帮助！端

Answer 1

组的未定义方法'first_name'：0x007fa3f4a038a0

使用inverse_of，您正在设置双向关联，因为fisrt_name 不适用于Group ，它吐出了那个错误。

<强> 解决方案：

只需删除inverse_of

即可

class Group < ApplicationRecord
  has_many :users
  has_many :ciphers, :dependent => :destroy
  accepts_nested_attributes_for :ciphers, :reject_if => :all_blank, :allow_destroy => true
end

Ruby on rails正在混合两个父关系

1 个答案: