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A toolkit for data mapping and language integrated query for Elixir
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lib/ecto/query/builder/limit_offset.ex
defmodule Ecto.Query.Builder.LimitOffset do
@moduledoc false
alias Ecto.Query.Builder
@doc """
Validates the expression is an integer or raise.
"""
@spec validate(Macro.t) :: Macro.t | no_return
def validate(expr) when is_integer(expr), do: expr
def validate(expr) do
raise Ecto.QueryError, reason: "limit and offset expressions must be a single " <>
"integer value, got: #{inspect expr}"
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(:limit | :offset, Macro.t, Macro.t, Macro.Env.t) :: Macro.t
def build(type, query, expr, env) do
expr =
case is_integer(expr) do
true -> expr
false -> quote do: unquote(__MODULE__).validate(unquote(expr))
end
Builder.apply_query(query, __MODULE__, [type, expr], env)
end
@doc """
The callback applied by `build/4` to build the query.
"""
@spec apply(Ecto.Queryable.t, :limit | :offset, term) :: Ecto.Query.t
def apply(query, :limit, value) do
query = Ecto.Queryable.to_query(query)
%{query | limit: value}
end
def apply(query, :offset, value) do
query = Ecto.Queryable.to_query(query)
%{query | offset: value}
end
end