在循环中添加 Rails ActiveRecord 关联

发布于 2024-09-16 07:12:43 字数 521 浏览 2 评论 0原文

我想通过关联为数组中的每个符号添加一个 has_many 到 activerecord 模型类。例如，

PeopleOrganisation::ROLES.each do |role|
    has_many role.to_s.pluralize.to_sym, :through => :people_organisations, :source => :person,
      :conditions => "people_organisations.role = '#{role.to_s}'" do
      def << (object)
        PeopleOrganisation.send(:with_scope, :create => {:role => **role**}) { self.concat object }
      end
      end
  end

除了 def 方法中对角色变量的引用之外，一切正常。这是因为 def 方法不是闭包。有办法实现我想要的吗？

原文

I want to add a has_many through association to a activerecord model class for each symbol in an array. for example

PeopleOrganisation::ROLES.each do |role|
    has_many role.to_s.pluralize.to_sym, :through => :people_organisations, :source => :person,
      :conditions => "people_organisations.role = '#{role.to_s}'" do
      def << (object)
        PeopleOrganisation.send(:with_scope, :create => {:role => **role**}) { self.concat object }
      end
      end
  end

everything works fine except for the reference to the role variable inside the method def. This is because the method def is not a closure. Is there a way of achieving what I want?

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暖阳 2024-09-23 07:12:43

试试这个：

PeopleOrganisation::ROLES.each do |role|
  has_many(role.to_s.pluralize.to_sym, 
             :through => :people_organisations, :source => :person,
             :conditions => ["people_organisations.role = ?", role]
  ) do
    define_method("<<") do |object|
      PeopleOrganisation.send(:with_scope, :create => {:role => role}) { 
        self.concat object 
      }
    end
  end
end

Try this:

PeopleOrganisation::ROLES.each do |role|
  has_many(role.to_s.pluralize.to_sym, 
             :through => :people_organisations, :source => :person,
             :conditions => ["people_organisations.role = ?", role]
  ) do
    define_method("<<") do |object|
      PeopleOrganisation.send(:with_scope, :create => {:role => role}) { 
        self.concat object 
      }
    end
  end
end

回复收藏 0 原文

丑丑阿 2024-09-23 07:12:43

您可以尝试使用 define_method 方法，而不是使用 def 定义方法：

PeopleOrganisation::ROLES.each do |role|
  has_many role.to_s.pluralize.to_sym, :through => :people_organisations, :source => :person,
           :conditions => "people_organisations.role = '#{role.to_s}'" do
    define_method(:<<) do |object|
      PeopleOrganisation.send(:with_scope, :create => {:role => role}) { self.concat object }
    end
  end
end

Instead of defining method using def you can try define_method method:

PeopleOrganisation::ROLES.each do |role|
  has_many role.to_s.pluralize.to_sym, :through => :people_organisations, :source => :person,
           :conditions => "people_organisations.role = '#{role.to_s}'" do
    define_method(:<<) do |object|
      PeopleOrganisation.send(:with_scope, :create => {:role => role}) { self.concat object }
    end
  end
end

回复收藏 0 原文

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