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Association dataloader with graphql-ruby
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| # official docs: https://graphql-ruby.org/dataloader/sources.html | |
| # app/graphql/sources/association.rb | |
| class Sources::Association < ::GraphQL::Dataloader::Source | |
| def initialize(association_name, preload_model = nil, preload_scope = nil) | |
| @association_name = association_name | |
| # `dataloader.with(Sources::Association, :foo, Model.preload(scope))` のように | |
| # 最初からpreloadしたクラスを渡すと処理がbatchにならないため、別々に渡した上で内部で結合する | |
| @scope = if preload_model && preload_scope | |
| preload_model.preload(preload_scope) | |
| end | |
| end | |
| def fetch(records) | |
| ::ActiveRecord::Associations::Preloader.new.preload(records, @association_name, @scope) | |
| # Rails7 | |
| # ::ActiveRecord::Associations::Preloader.new(records: records, associations: @association_name, scope: @scope).call | |
| records.map { |record| record.public_send(@association_name) } | |
| end | |
| end |
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