Provides query composition macros for building complex relation queries.

This module contains macros for transforming query expressions and enabling composition of relation operations. It supports logical operations (AND/OR) and function call transformations within query contexts.

Usage

defmodule Users do
  use Drops.Relation, repo: MyApp.Repo

  schema("users", infer: true)

  defquery active(), do: from(u in relation(), where: u.active == true)

  defquery by_role(role), do: from(u in relation(), where: u.role == ^role)
end

query(Users, [u], u.active() and u.by_role("admin"))

Supported Operations

• and - Logical AND composition
• or - Logical OR composition
• Function calls on relation bindings

The macro transforms expressions to use the appropriate relation operations and maintains proper binding contexts for complex queries.