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The extension for building GraphQL APIs with Ash
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lib/resource/verifiers/verify_paginate_relationship_with.ex
# SPDX-FileCopyrightText: 2020 ash_graphql contributors <https://github.com/ash-project/ash_graphql/graphs/contributors>
#
# SPDX-License-Identifier: MIT
defmodule AshGraphql.Resource.Verifiers.VerifyPaginateRelationshipWith do
# Validates the paginate_relationship_with option
@moduledoc false
use Spark.Dsl.Verifier
alias Spark.Dsl.Verifier
@valid_strategies [
nil,
:none,
:keyset,
:offset,
:relay
]
def verify(dsl) do
many_relationship_names =
dsl
|> Verifier.get_entities([:relationships])
|> Enum.filter(&(&1.cardinality == :many))
|> Enum.map(& &1.name)
dsl
|> Verifier.get_option([:graphql], :paginate_relationship_with, [])
|> Enum.each(fn {relationship_name, strategy} ->
cond do
relationship_name not in many_relationship_names ->
module = Verifier.get_persisted(dsl, :module)
raise Spark.Error.DslError,
module: module,
path: [:graphql, :paginate_relationship_with],
message: """
#{relationship_name} is not a relationship with cardinality many.
"""
strategy not in @valid_strategies ->
module = Verifier.get_persisted(dsl, :module)
choices = Enum.map_join(@valid_strategies, ", ", &inspect/1)
raise Spark.Error.DslError,
module: module,
path: [:graphql, :paginate_relationship_with],
message: """
#{inspect(strategy)} is not a valid pagination strategy for relationships.
Available strategies: #{choices}
"""
true ->
:ok
end
end)
end
end