Question

我有一个与学校有关联的用户模型（用户包含一个名为school_id的外键）。当用户注册（或创建）时，用户可以选择指定他们参加的学校。我目前遇到的问题是，一旦用户通过学校名称，我不确定如何设置school_id。我目前收到的错误是＆＃34;未定义的方法`id＆＃39;为零：NilClass＆＃34;为：

class User < ActiveRecord::Base
  extend FriendlyId

  belongs_to :school

  #... other code

  before_validation :find_school_id

  def find_school_id
    self.school_id = School.find_by(name: self.school).id
  end
end

查看

<div>
  <%= f.label :school %>
  <%= f.autocomplete_field :school, autocomplete_school_name_suggestions_path %>
</div>

Answer 1

尝试：

型号：

class User < ActiveRecord::Base
  extend FriendlyId

  belongs_to :school

  #... other code

  before_validation :find_school_id

  def school_name=(value)
    self.school = School.find_by(name: value)
  end

  def school_name
    school && school.name
  end
end

查看：

<div>
  <%= f.label :school_name %>
  <%= f.autocomplete_field :school_name, autocomplete_school_name_suggestions_path %>
</div>

将belongs_to关系传递回模型

1 个答案: