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Contents
# frozen_string_literal: true
module ActionPolicy
module Behaviours
# Per-instance memoization for policies.
#
# Used by `policy_for` to re-use policy object for records.
#
# Example:
#
# include ActionPolicy::Behaviour
# include ActionPolicy::Memoized
#
# record = User.first
# policy = policy_for(record)
# policy2 = policy_for(record)
#
# policy.equal?(policy) #=> true
#
# policy.equal?(policy_for(record, with: CustomPolicy)) #=> false
module Memoized
class << self
def prepended(base)
base.prepend InstanceMethods
end
alias_method :included, :prepended
end
module InstanceMethods # :nodoc:
def policy_for(record:, **opts)
__policy_memoize__(record, **opts) { super(record: record, **opts) }
end
end
def __policy_memoize__(record, **options)
cache_key = policy_for_cache_key(record: record, **options)
return __policies_cache__[cache_key] if
__policies_cache__.key?(cache_key)
policy = yield
__policies_cache__[cache_key] = policy
end
def __policies_cache__
@__policies_cache__ ||= {}
end
end
end
end
Version data entries
13 entries across 13 versions & 1 rubygems