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A toolkit for data mapping and language integrated query for Elixir
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lib/ecto/query/builder/lock.ex
defmodule Ecto.Query.Builder.Lock do
@moduledoc false
alias Ecto.Query.Builder
@doc """
Escapes the lock code.
iex> escape(quote do: "FOO")
"FOO"
"""
@spec escape(Macro.t) :: Macro.t | no_return
def escape(lock) when is_binary(lock), do: lock
def escape(other) do
Builder.error! "`#{Macro.to_string(other)}` is not a valid lock. " <>
"For security reasons, a lock must always be a literal string"
end
@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.Env.t) :: Macro.t
def build(query, expr, env) do
Builder.apply_query(query, __MODULE__, [escape(expr)], 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, value) do
query = Ecto.Queryable.to_query(query)
%{query | lock: value}
end
end