Swagger Docs index method - ruby-on-rails

Question

My swagger index DSL is responding with the api/v1/users.json generated from rake swagger:docs.
Api::V1::UsersController:
swagger_api :index do
summary 'Returns list of users'
notes '/api/v1/users'
end
def index
#users = User.all
render(json: { users: ActiveModel::ArraySerializer.new(#users, each_serializer: Api::V1::UserSerializer) })
end
And when I try go the the actual api documentation and run /api/v1/users.json call ("Try it out!"), I get the public api definition for the whole users api controller:
{
"apiVersion": "1.0",
"swaggerVersion": "1.2",
"basePath": "http://localhost:3000",
"resourcePath": "users",
"apis": [
{
"path": "/api/v1/users.json",
"operations": [
{
"summary": "Returns list of users",
"notes": "/api/v1/users",
"nickname": "Api::V1::Users#index",
"method": "get"
}
]
},
{
"path": "/api/v1/users/{id}.json",
"operations": [
{
"summary": "Returns a user",
"notes": "/api/v1/users/:id",
"parameters": [
{
"paramType": "path",
"name": "id",
"type": "integer",
"description": "User Id",
"required": false
}
],
"nickname": "Api::V1::Users#show",
"method": "get"
}
]
}
],
"authorizations": null
}
Also, when I try the call in Postman, it returns an array of Users like I would expect.