Packages
ecto
0.10.2
3.14.1
3.14.0
3.13.6
3.13.5
3.13.4
3.13.3
3.13.2
3.13.1
3.13.0
3.12.6
3.12.5
3.12.4
3.12.3
3.12.2
3.12.1
3.12.0
3.11.2
3.11.1
3.11.0
3.10.3
3.10.2
3.10.1
3.10.0
3.9.6
3.9.5
3.9.4
3.9.3
3.9.2
3.9.1
3.9.0
3.8.4
3.8.3
3.8.2
3.8.1
3.8.0
3.7.2
3.7.1
3.7.0
3.6.2
3.6.1
3.6.0
3.5.8
3.5.7
3.5.6
3.5.5
3.5.4
3.5.3
3.5.2
3.5.1
3.5.0
3.5.0-rc.1
3.5.0-rc.0
3.4.6
3.4.5
3.4.4
3.4.3
3.4.2
3.4.1
3.4.0
3.3.4
3.3.3
3.3.2
3.3.1
3.3.0
3.2.5
3.2.4
3.2.3
3.2.2
3.2.1
3.2.0
3.1.7
3.1.6
3.1.5
3.1.4
3.1.3
3.1.2
3.1.1
3.1.0
3.0.9
3.0.8
3.0.7
3.0.6
3.0.5
3.0.4
3.0.3
3.0.2
3.0.1
3.0.0
3.0.0-rc.1
3.0.0-rc.0
2.2.12
2.2.11
2.2.10
2.2.9
2.2.8
2.2.7
2.2.6
2.2.5
2.2.4
2.2.3
2.2.2
2.2.1
2.2.0
2.2.0-rc.1
2.2.0-rc.0
2.1.6
2.1.5
2.1.4
2.1.3
2.1.2
2.1.1
2.1.0
2.1.0-rc.5
2.1.0-rc.4
2.1.0-rc.3
2.1.0-rc.2
2.1.0-rc.1
2.1.0-rc.0
2.0.6
2.0.5
2.0.4
2.0.3
2.0.2
2.0.1
2.0.0
2.0.0-rc.6
2.0.0-rc.5
2.0.0-rc.4
2.0.0-rc.3
2.0.0-rc.2
2.0.0-rc.1
2.0.0-rc.0
2.0.0-beta.2
2.0.0-beta.1
2.0.0-beta.0
1.1.9
1.1.8
1.1.7
1.1.6
1.1.5
1.1.4
1.1.3
1.1.2
1.1.1
1.1.0
1.0.7
1.0.6
1.0.5
1.0.4
1.0.3
1.0.2
1.0.1
1.0.0
0.16.0
0.15.0
0.14.3
0.14.2
0.14.1
0.14.0
0.13.1
0.13.0
0.12.1
0.12.0
0.12.0-rc
0.11.3
0.11.2
0.11.1
0.11.0
0.10.3
0.10.2
0.10.1
0.10.0
0.9.0
0.8.1
0.8.0
0.7.2
0.7.1
0.7.0
0.6.0
0.5.1
0.5.0
0.4.0
0.3.0
0.2.8
0.2.7
0.2.6
0.2.5
0.2.4
0.2.3
0.2.2
0.2.1
0.2.0
0.1.0
A toolkit for data mapping and language integrated query for Elixir
Current section
Files
Jump to
Current section
Files
lib/ecto/query/builder/limit_offset.ex
defmodule Ecto.Query.Builder.LimitOffset 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(:limit | :offset, Macro.t, [Macro.t], Macro.t, Macro.Env.t) :: Macro.t
def build(type, query, binding, expr, env) do
binding = Builder.escape_binding(binding)
{expr, params} = Builder.escape(expr, :integer, %{}, binding, env)
params = Builder.escape_params(params)
if contains_variable?(expr) do
Builder.error! "query variables are not allowed in #{type} expression"
end
limoff = quote do: %Ecto.Query.QueryExpr{
expr: unquote(expr),
params: unquote(params),
file: unquote(env.file),
line: unquote(env.line)}
Builder.apply_query(query, __MODULE__, [type, limoff], env)
end
defp contains_variable?({:&, _, _}),
do: true
defp contains_variable?({left, _, right}),
do: contains_variable?(left) or contains_variable?(right)
defp contains_variable?({left, right}),
do: contains_variable?(left) or contains_variable?(right)
defp contains_variable?(list) when is_list(list),
do: Enum.any?(list, &contains_variable?/1)
defp contains_variable?(_),
do: false
@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, expr) do
query = Ecto.Queryable.to_query(query)
%{query | limit: expr}
end
def apply(query, :offset, expr) do
query = Ecto.Queryable.to_query(query)
%{query | offset: expr}
end
end