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# Helper methods for all loaders
class Loaders::BaseLoader < GraphQL::Batch::Loader
# Convert a class method into a resolver proc. The method should follow the
# (obj, args, ctx) calling convention
class << self
def [](sym)
resolver = method(sym)
raise ArgumentError.new("#{self}.#{sym} is not a resolver") unless resolver.arity == 3
resolver
end
end
# Fulfill all keys. Pass a block that converts each result into a key.
# Any keys not in results will be fulfilled with nil.
def fulfill_all(results, keys, &key_blk)
results.each do |result|
key = yield result
fulfill(key, result)
end
keys.each { |key| fulfill(key, nil) unless fulfilled?(key) }
end
end
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