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# frozen_string_literal: true
module NextFoundInstanceOf
ERROR_MESSAGE = 'NextFoundInstanceOf mock helpers can only be used with ActiveRecord targets'
HELPER_METHOD_PATTERN = /(?:allow|expect)_next_found_(?<number>\d+)_instances_of/
def method_missing(method_name, ...)
return super unless match_data = method_name.match(HELPER_METHOD_PATTERN)
helper_method = method_name.to_s.sub("_#{match_data[:number]}", '')
public_send(helper_method, *args, match_data[:number].to_i, &block)
end
def expect_next_found_instance_of(klass, &block)
expect_next_found_instances_of(klass, nil, &block)
end
def expect_next_found_instances_of(klass, number)
check_if_active_record!(klass)
stub_allocate(expect(klass), klass, number) do |expectation|
yield(expectation)
end
end
def allow_next_found_instance_of(klass, &block)
allow_next_found_instances_of(klass, nil, &block)
end
def allow_next_found_instances_of(klass, number)
check_if_active_record!(klass)
stub_allocate(allow(klass), klass, number) do |allowance|
yield(allowance)
end
end
private
def check_if_active_record!(klass)
raise ArgumentError, ERROR_MESSAGE unless klass < ActiveRecord::Base
end
def stub_allocate(target, klass, number)
stub = receive(:allocate)
stub.exactly(number).times if number
target.to stub.and_wrap_original do |method|
method.call.tap do |allocation|
# ActiveRecord::Core.allocate returns a frozen object:
# https://github.com/rails/rails/blob/291a3d2ef29a3842d1156ada7526f4ee60dd2b59/activerecord/lib/active_record/core.rb#L620
# It's unexpected behavior and probably a bug in Rails
# Let's work it around by setting the attributes to default to unfreeze the object for now
allocation.instance_variable_set(:@attributes, klass._default_attributes)
yield(allocation)
end
end
end
end
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