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require "cases/helper"
class CallbacksTest < ActiveModel::TestCase
class CallbackValidator
def around_create(model)
model.callbacks << :before_around_create
yield
model.callbacks << :after_around_create
false
end
end
class ModelCallbacks
attr_reader :callbacks
extend ActiveModel::Callbacks
define_model_callbacks :create
define_model_callbacks :initialize, only: :after
define_model_callbacks :multiple, only: [:before, :around]
define_model_callbacks :empty, only: []
before_create :before_create
around_create CallbackValidator.new
after_create do |model|
model.callbacks << :after_create
false
end
after_create "@callbacks << :final_callback"
def initialize(options = {})
@callbacks = []
@valid = options[:valid]
@before_create_returns = options[:before_create_returns]
end
def before_create
@callbacks << :before_create
@before_create_returns
end
def create
run_callbacks :create do
@callbacks << :create
@valid
end
end
end
test "complete callback chain" do
model = ModelCallbacks.new
model.create
assert_equal model.callbacks, [ :before_create, :before_around_create, :create,
:after_around_create, :after_create, :final_callback]
end
test "the callback chain is not halted when around or after callbacks return false" do
model = ModelCallbacks.new
model.create
assert_equal model.callbacks.last, :final_callback
end
test "the callback chain is halted when a before callback returns false" do
model = ModelCallbacks.new(before_create_returns: false)
model.create
assert_equal model.callbacks.last, :before_create
end
test "after callbacks are not executed if the block returns false" do
model = ModelCallbacks.new(valid: false)
model.create
assert_equal model.callbacks, [ :before_create, :before_around_create,
:create, :after_around_create]
end
test "only selects which types of callbacks should be created" do
assert !ModelCallbacks.respond_to?(:before_initialize)
assert !ModelCallbacks.respond_to?(:around_initialize)
assert_respond_to ModelCallbacks, :after_initialize
end
test "only selects which types of callbacks should be created from an array list" do
assert_respond_to ModelCallbacks, :before_multiple
assert_respond_to ModelCallbacks, :around_multiple
assert !ModelCallbacks.respond_to?(:after_multiple)
end
test "no callbacks should be created" do
assert !ModelCallbacks.respond_to?(:before_empty)
assert !ModelCallbacks.respond_to?(:around_empty)
assert !ModelCallbacks.respond_to?(:after_empty)
end
class Violin
attr_reader :history
def initialize
@history = []
end
extend ActiveModel::Callbacks
define_model_callbacks :create
def callback1; self.history << 'callback1'; end
def callback2; self.history << 'callback2'; end
def create
run_callbacks(:create) {}
self
end
end
class Violin1 < Violin
after_create :callback1, :callback2
end
class Violin2 < Violin
after_create :callback1
after_create :callback2
end
test "after_create callbacks with both callbacks declared in one line" do
assert_equal ["callback1", "callback2"], Violin1.new.create.history
end
test "after_create callbacks with both callbacks declared in different lines" do
assert_equal ["callback1", "callback2"], Violin2.new.create.history
end
end
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