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A collection of handy Elixir macros for CQRS applications.
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lib/cqrs/absinthe/field_mapping.ex
if Code.ensure_loaded?(Absinthe) do
defmodule Cqrs.Absinthe.FieldMapping do
@moduledoc false
require Logger
def reject_parent_mappings(fields, opts) do
field_mappings = Keyword.get(opts, :parent_mappings, []) |> Keyword.keys()
Enum.reject(fields, fn {field, _, _} -> Enum.member?(field_mappings, field) end)
end
def resolve_parent_mappings(attrs, module, parent, opts) do
field_mappings = Keyword.get(opts, :parent_mappings, [])
Enum.reduce(field_mappings, attrs, fn
{field_name, resolver_fun}, acc when is_function(resolver_fun, 1) ->
Map.put(acc, field_name, resolver_fun.(parent))
{field_name, _resolver_fun}, acc ->
Logger.warn(
"#{inspect(module)} - Invalid Field Mapping for #{field_name}. Expected a function with an arity of 1"
)
acc
end)
end
def run_field_transformations(attrs, module, opts) do
field_transformations = Keyword.get(opts, :field_transforms, []) ++ Keyword.get(opts, :filter_transforms, [])
Enum.reduce(field_transformations, attrs, fn
{field_name, transform_fun}, acc when is_function(transform_fun, 1) ->
Map.update(acc, field_name, nil, transform_fun)
{field_name, _transform_fun}, acc ->
Logger.warn(
"#{inspect(module)} - Invalid Field Transformation for #{field_name}. Expected a function with an arity of 1"
)
acc
end)
end
end
end