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what is the difference between resource and resources in rails routing
resource :geocoder and
resources :posts What is real difference between them ?
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Difference between singular resource and resources in Rails routes. So far, we have been using resources to declare a resource. Rails also lets us declare a singular version of it using resource. Rails recommends us to use singular resource when we do not have an identifier.
Rails provides RESTful routing for resources. Routes can either define single resource or plural resources to generate routes of the application. There is a logical difference that should be considered when selecting resource or resources when generating routers.
Any object that you want users to be able to access via URI and perform CRUD (or some subset thereof) operations on can be thought of as a resource. In the Rails sense, it is generally a database table which is represented by a model, and acted on through a controller.
Resource routing allows you to quickly declare all of the common routes for a given resourceful controller. A single call to resources can declare all of the necessary routes for your index , show , new , edit , create , update , and destroy actions.
In essence, routing resources is when resources gives action abilities to a controller.
http://guides.rubyonrails.org/routing.html#specifying-a-controller-to-use
If a pluralized resources is used as a way to handle generic requests on any item, then a singular resource is a way to work on the current item at hand.
So in other words, if I have a collection of Apples, to retrieve a specific apple, I'd have to tell the router "Apples" what apple to retrieve by sending the ID of the apple. If I already have one Apple, then an ID is not needed.
Notice the differences between the two by looking at what actions (or routes) they have:
In your example:
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