Fix: Fix size matcher for has_many_attached attachments

[jozzi05]

This PR fixes the size validator matcher for has_many_attached attachments.

Details:

Currently, the matcher checks all edge cases for size validation in chain:

active_storage_validations/lib/active_storage_validations/matchers/size_validator_matcher.rb

Line 54 in dc76544

responds_to_methods && not_lower_than_min? && higher_than_min? && lower_than_max? && not_higher_than_max?

this works for has_one_attached attachments since whenever attach method is called, previous attachment is being replaced with a new one.

active_storage_validations/lib/active_storage_validations/matchers/size_validator_matcher.rb

Line 92 in dc76544

@subject.public_send(@attribute_name).attach(io: io, filename: 'test.png', content_type: 'image/pg')

Unfortunately, this is not the case for has_many_attached attachments since the attach method adds new attachments to the list, which leads to having error validations for attachments from previous checks. To solve this issue, I added cleanup of attachments after each step.

.tap { @subject.attachment_changes["#{@attribute_name}"] = nil }

It works, but if there's a better way of fixing it, please let me know, and I will try to provide a better solution.

[jozzi05]

@igorkasyanchuk @Mth0158 I would love to hear your feedback also in regards to this fix 🙏

[jozzi05]

Same as mentioned in other PR (#209 (comment))