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Contents
# frozen_string_literal: true
# ref: https://zenn.dev/necocoa/articles/setup-graphql-batch
module Ibrain
module Loaders
class AssociationLoader < GraphQL::Batch::Loader
def self.validate(model, association_name)
new(model, association_name)
nil
end
def initialize(model, association_name)
super()
@model = model
@association_name = association_name
validate
end
def load(record)
unless record.is_a?(@model)
raise TypeError,
"#{@model} loader can't load association for #{record.class}"
end
return Promise.resolve(read_association(record)) if association_loaded?(record)
super
end
# We want to load the associations on all records, even if they have the same id
def cache_key(record)
record.object_id
end
def perform(records)
preload_association(records)
records.each { |record| fulfill(record, read_association(record)) }
end
private
def validate
return if @model.reflect_on_association(@association_name)
raise ArgumentError, "No association #{@association_name} on #{@model}"
end
def preload_association(records)
::ActiveRecord::Associations::Preloader.new.preload(records, @association_name)
end
def read_association(record)
record.public_send(@association_name)
end
def association_loaded?(record)
record.association(@association_name).loaded?
end
end
end
end
Version data entries
60 entries across 60 versions & 1 rubygems