protocol Ecto.Queryable not implemented for <Module>, the given module does not exist

phoenix_belongs_to_catch

 defmodule Freshcards.Post do
   use Freshcards.Web, :model
 
   schema "posts" do
     field :title, :string
     belongs_to :user, Freshcards.User # right!
     # belongs_to :user, User  <-- wrong
     timestamps
   end
 
   @required_fields ~w(title, user_id)
   @optional_fields ~w()
 
   def changeset(model, params \\ nil) do
     cast(model, params, @required_fields, @optional_fields)
   end
 end
 
 alias Freshcards.Post
 alias Freshcards.User # <-Doing the alias here will not allow the schema "posts" to "see" the module User.
 # The alias should be done inside the module!
 # And that's why when we user preload() on a post we get:
 # "protocol Ecto.Queryable not implemented for <Module>, the given module does not exist"
 

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