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A toolkit for data mapping and language integrated query for Elixir
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lib/ecto/query/builder/combination.ex
import Kernel, except: [apply: 2]
defmodule Ecto.Query.Builder.Combination do
@moduledoc false
alias Ecto.Query.Builder
@doc """
Builds a quoted expression.
The quoted expression should evaluate to a query at runtime.
If possible, it does all calculations at compile time to avoid
runtime work.
"""
@spec build(atom, Macro.t, Macro.t, Macro.Env.t) :: Macro.t
def build(kind, query, {:^, _, [expr]}, env) do
expr = quote do: Ecto.Queryable.to_query(unquote(expr))
Builder.apply_query(query, __MODULE__, [[{kind, expr}]], env)
end
def build(kind, _query, other, _env) do
Builder.error! "`#{Macro.to_string(other)}` is not a valid #{kind}. " <>
"#{kind} must always be an interpolated query, such as ^existing_query"
end
@doc """
The callback applied by `build/4` to build the query.
"""
@spec apply(Ecto.Queryable.t, term) :: Ecto.Query.t
def apply(%Ecto.Query{combinations: combinations} = query, value) do
%{query | combinations: combinations ++ value}
end
def apply(query, value) do
apply(Ecto.Queryable.to_query(query), value)
end
end