是否可以将控制器动作“映射”到另一个控制器动作但更改某些参数？

Question

我正在使用 Ruby on Rails 3.2.2，我想知道是否可以将一个控制器动作“映射”到另一个控制器动作但更改一些参数。也就是说，我有以下模型和控制器：

# File system:
# /app/models/articles/user_association.rb
# /app/models/users/article_association.rb
# /app/controllers/users/article_associations_controller.rb
# /app/controllers/articles/user_associations_controller.rb


# /app/models/articles/user_association.rb
class Articles::UserAssociation < ActiveRecord::Base
  ...
end

# /app/models/users/article_association.rb
class Users::ArticleAssociation < Articles::UserAssociation # Note inheritance
  #none
end

# /app/controllers/users/article_associations_controller.rb
class Articles::UserAssociationsController < ApplicationController
  def show
    @articles_user_association = Articles::UserAssociation.find(params[:article_id])
    ...
  end

  def edit
    @articles_user_association = Articles::UserAssociation.find(params[:article_id])
    ...
  end

  ...
end

# /app/controllers/articles/user_associations_controller.rb
class Users::ArticleAssociationsController < ApplicationController
  def show
    # It is the same as the Articles::UserAssociationsController#show 
    # controller action; the only thing that changes compared to 
    # Articles::UserAssociationsController#show is the usage of 
    # 'params[:user_id]' instead of 'params[:article_id]'.
    @users_article_association = Users::ArticleAssociation.find(params[:user_id])
    ...
  end

  def edit
    # It is the same as the Articles::UserAssociationsController#edit
    # controller action; the only thing that changes compared to  
    # Articles::UserAssociationsController#edit is the usage of
    # 'params[:article_id]' instead of 'params[:user_id]'. 
    @users_article_association = Users::ArticleAssociation.find(params[:user_id])
    ...
  end

  ...
end

所以，我想将指向/users/:user_id/article 路径的HTTP 请求作为与/articles/:article_id/user 路径相关的控制器操作来处理。

注意：我想这样做是为了 DRY（不要重复自己）代码，但是，如前所述，Users::ArticleAssociationsController 和 Articles::UserAssociationsController#show 之间的唯一变化是params。

有可能吗？

Answer 1

您不仅可以修改参数，还可以更改要查找的类。

@users_article_association = Users::ArticleAssociation.find(params[:user_id])
# and
@users_article_association = Articles::UserAssociation.find(params[:article_id])

它们完全不同。我建议你处理这些差异，然后将真正的公共代码提取到另一个方法中，并从双方调用。