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ecto
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A toolkit for data mapping and language integrated query for Elixir
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lib/ecto/queryable.ex
defprotocol Ecto.Queryable do
@moduledoc """
The `Queryable` protocol is responsible for converting a structure to an
`Ecto.Query` struct. The only function required to implement is
`to_query` which does the conversion.
"""
def to_query(expr)
end
defimpl Ecto.Queryable, for: Ecto.Query do
def to_query(query), do: query
end
defimpl Ecto.Queryable, for: BitString do
def to_query(source) when is_binary(source),
do: %Ecto.Query{from: {source, nil}}
end
defimpl Ecto.Queryable, for: Atom do
def to_query(module) do
try do
%Ecto.Query{from: {module.__schema__(:source), module}}
rescue
UndefinedFunctionError ->
raise Protocol.UndefinedError,
protocol: @protocol,
value: module,
description: "the given module/atom is not queryable"
end
end
end
defimpl Ecto.Queryable, for: Tuple do
@has_many Ecto.Associations.HasMany.Proxy
def to_query(tuple) when elem(tuple, 0) == @has_many do
tuple.__queryable__
end
def to_query(tuple) do
raise Protocol.UndefinedError,
protocol: @protocol,
value: tuple,
description: "the given tuple is not queryable"
end
end