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A collection of handy Elixir macros for CQRS applications.
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lib/cqrs/absinthe/query.ex
if Code.ensure_loaded?(Absinthe) do
defmodule Cqrs.Absinthe.Query do
@moduledoc false
alias Cqrs.{BoundedContext, Absinthe.Args, Absinthe.Metadata}
def create_connection_query(query_module, returns, opts) do
function_name = BoundedContext.__function_name__(query_module, opts)
query_args = create_query_args(query_module, opts)
opts =
:cqrs_tools
|> Application.get_env(:absinthe_relay, [])
|> Keyword.merge(opts)
repo = Keyword.fetch!(opts, :repo)
quote do
connection field unquote(function_name), node_type: unquote(returns) do
unquote_splicing(query_args)
resolve(fn args, resolution ->
alias Absinthe.Relay.Connection
opts = Metadata.merge(resolution, unquote(opts))
case BoundedContext.__create_query__(unquote(query_module), args, opts) do
{:error, error} ->
{:error, error}
{:ok, query} ->
repo_fun = fn args ->
fun = Keyword.get(unquote(opts), :repo_fun, :all)
apply(unquote(repo), fun, [args])
end
Connection.from_query(query, repo_fun, args)
end
end)
end
end
end
def create_query(query_module, returns, opts) do
function_name = BoundedContext.__function_name__(query_module, opts)
query_args = create_query_args(query_module, opts)
quote do
field unquote(function_name), unquote(returns) do
unquote_splicing(query_args)
resolve(fn attrs, resolution ->
opts =
resolution
|> Metadata.merge(unquote(opts))
|> Keyword.put(:tag?, true)
BoundedContext.__execute_query__(unquote(query_module), attrs, opts)
end)
end
end
end
defp create_query_args(query_module, opts) do
query_module.__filters__()
|> Args.extract_args(opts)
|> Enum.map(fn {name, absinthe_type, required, opts} ->
case required do
true -> quote do: arg(unquote(name), non_null(unquote(absinthe_type)), unquote(opts))
false -> quote do: arg(unquote(name), unquote(absinthe_type), unquote(opts))
end
end)
end
end
end