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A toolkit for data mapping and language integrated query for Elixir
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lib/ecto/query/distinct_builder.ex
defmodule Ecto.Query.DistinctBuilder do
@moduledoc false
alias Ecto.Query.BuilderUtil
@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(Macro.t, [Macro.t], Macro.t, Macro.Env.t) :: Macro.t
def build(query, binding, expr, env) do
binding = BuilderUtil.escape_binding(binding)
expr = BuilderUtil.escape_fields_and_vars(expr, binding)
distinct = quote do: %Ecto.Query.QueryExpr{expr: unquote(expr),
file: unquote(env.file), line: unquote(env.line)}
BuilderUtil.apply_query(query, __MODULE__, [distinct], env)
end
@doc """
The callback applied by `build/4` to build the query.
"""
@spec apply(Ecto.Queryable.t, term) :: Ecto.Query.t
def apply(query, expr) do
query = Ecto.Queryable.to_query(query)
%{query | distincts: query.distincts ++ [expr]}
end
end