Ruby on Rails

I have generated a model and a controller in rails 4,Client and ClientsController, and configure the database.yml with the postgres adapater and the database name, and i want that rails get the table attributes from the clients table and generate the forms and all the scaffolding CRUD operations. I've seen in the web some similar solutions but with mysql database and i think with rails 3:

class ClientsController < ApplicationController    scaffold:client  end

 but when calling any of the web urls, rails advertised that i have   pending migrations, and if you think about it i dont need to migrate the   model because is already in the database....

any help is welcome !

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