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To avoid repetition in nested routes, concerns provide a great way of sharing common resources that are reusable.
To create a concern use the method concern within the routes.rb file.
The method expects a symbol and block:

concern :commentable do
  resources :comments
endClicking "Copy Code" button will copy the code into the clipboard - memory. Please paste(Ctrl+V) it in your destination. The code will get pasted. Happy coding from Wikitechy - ruby on rails tutorial - rails guides - ruby rails - rubyonrails - learn ruby on rails - team

While not creating any routes itself, this code allows using the :concerns attribute on a resource. The simplest example would be:

resource :page, concerns: :commentableClicking "Copy Code" button will copy the code into the clipboard - memory. Please paste(Ctrl+V) it in your destination. The code will get pasted. Happy coding from Wikitechy - ruby on rails tutorial - rails guides - ruby rails - rubyonrails - learn ruby on rails - team

The equivalent nested resource would look like this:

resource :page do
  resource :comments
endClicking "Copy Code" button will copy the code into the clipboard - memory. Please paste(Ctrl+V) it in your destination. The code will get pasted. Happy coding from Wikitechy - ruby on rails tutorial - rails guides - ruby rails - rubyonrails - learn ruby on rails - team

This would build, for example, the given below routes:

/pages/#{page_id}/comments
/pages/#{page_id}/comments/#{comment_id}Clicking "Copy Code" button will copy the code into the clipboard - memory. Please paste(Ctrl+V) it in your destination. The code will get pasted. Happy coding from Wikitechy - ruby on rails tutorial - rails guides - ruby rails - rubyonrails - learn ruby on rails - team

For concerns to be meaningful, there must be multiple resources that utilize the concern.
Additional resources could use any of the following syntax to call the concern:

resource :post, concerns: %i(commentable)
resource :blog do
  concerns :commentable
endClicking "Copy Code" button will copy the code into the clipboard - memory. Please paste(Ctrl+V) it in your destination. The code will get pasted. Happy coding from Wikitechy - ruby on rails tutorial - rails guides - ruby rails - rubyonrails - learn ruby on rails - team

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