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GraphQL::Extras::PreloadDefault: preload associations by default #4

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GraphQL::Extras::PreloadDefault: preload associations by default #4

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39 changes: 39 additions & 0 deletions lib/graphql/extras/preload.rb
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Original file line number Diff line number Diff line change
Expand Up @@ -29,5 +29,44 @@ def resolve(object, args, context)
super
end
end

module PreloadDefault
# @override
def initialize(*args, preload: nil, **opts, &block)
@preload = preload
if maybe_preload(opts[:type])
@preload_by_name = opts[:name]&.to_s
end
super(*args, **opts, &block)
end

# @override
def resolve(object, args, context)
if @preload == false
# nop
elsif @preload
loader = context.dataloader.with(PreloadSource, @preload)
loader.load(object.object)
elsif @preload_by_name && object.object.class.respond_to?(:reflections) && object.object.class.reflections.key?(@preload_by_name)
loader = context.dataloader.with(PreloadSource, @preload_by_name)
loader.load(object.object)
end

super
end

private

def maybe_preload(type)
(
type.is_a?(Array) &&
type.first.is_a?(Class) &&
type.first < GraphQL::Schema::Object
) || (
type.is_a?(Class) &&
type < GraphQL::Schema::Object
)
end
end
end
end