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# Mixin for the {RailsOps::Operation} class that provides *policies*. Policies
# are simple blocks of code that run at specific places in your operation and
# can be used to check conditions such as params or permissions. Policies are
# inherited to subclasses of operations.
module RailsOps::Mixins::Policies
extend ActiveSupport::Concern
POLICY_CHAIN_KEYS = [
:on_init,
:before_perform,
:after_perform,
:before_nested_model_ops,
:before_model_save
].freeze
included do
class_attribute :_policy_chains
self._policy_chains = Hash[POLICY_CHAIN_KEYS.map { |key| [key, [].freeze] }]
end
module ClassMethods
# Register a new policy block that will be executed in the given `chain`.
# The policy block will be executed in the operation's instance context.
def policy(chain = :before_perform, prepend_action: false, &block)
unless POLICY_CHAIN_KEYS.include?(chain)
fail "Unknown policy chain #{chain.inspect}, available are #{POLICY_CHAIN_KEYS.inspect}."
end
self._policy_chains = _policy_chains.dup
if prepend_action
_policy_chains[chain] = [block] + _policy_chains[chain]
else
_policy_chains[chain] += [block]
end
end
# Returns all registered validation blocks for this operation class.
def policies_for(chain)
unless POLICY_CHAIN_KEYS.include?(chain)
fail "Unknown policy chain #{chain.inspect}, available are #{POLICY_CHAIN_KEYS.inspect}."
end
return _policy_chains[chain]
end
end
def run_policies(chain)
self.class.policies_for(chain).each do |block|
instance_eval(&block)
end
end
end
Version data entries
54 entries across 54 versions & 1 rubygems