Issue with Rails query joins - ruby-on-rails

Question

I have a really dumb issue, I have two models:
class User < ApplicationRecord
belongs_to :role
end
and
class Role < ApplicationRecord
has_many :user
end
I'm trying to get the user and make a join with the role's table to get the role's name and id, like:
"user" : {
"name": "json",
"role": {"name":"admin", "id":1}
}
however, after using:
User.includes(:role).all
I just get the users with a "role_id" value, I've also tried:
User.joins(:role)
With the same result. I've been looking at the official docs at (https://guides.rubyonrails.org/active_record_querying.html) and it should be pretty straightforward but I don't know what I'm doing wrong. Do I need to add something to my migrations?, At my create_user migration I have:
class CreateUsers < ActiveRecord::Migration[6.0]
def change
create_table :users do |t|
t.string :username
t.string :email
t.integer :role_id
end
add_index :users, :email
add_index :users, :username
end
end
and my create_roles migration
class CreateRoles < ActiveRecord::Migration[6.0]
def change
create_table :roles do |t|
t.string :name
end
end
end

Answer 1

all by itself doesn't return such a custom data. You can use as_json for that:
User.all.as_json(only: :name, include: { role: { only: [:name, :id] } }, root: true)
# User Load (0.5ms) SELECT "users".* FROM "users"
# Role Load (0.6ms) SELECT "roles".* FROM "roles" WHERE "roles"."id" = $1 LIMIT $2 [["id", 1], ["LIMIT", 1]]
# => [{"user"=>{"name"=>"json", "role"=>{"id"=>1, "name"=>"admin"}}}]