fix(UniquenessValidator): fill record's scope fields if they exist on form

[DemidenkoAndrey]

When you try to create new record and we have validates_uniqueness_of with scope we need to assign scope property from form to model to run validation correct

[seuros]

Can you write a sample for this usage ?

[DemidenkoAndrey]

@seuros
We have to fill region on model to be insure that validation on model will work correct with our region from form

# model
User(name: string, region: string)

class UsersForm < Reform::Form
  include Reform::Form::ActiveRecord
  property :name
  property :region

  validates_uniqueness_of :name, scope: :region

  model :user
end

# users_controller
def create
  user = User.new
  @form = UsersForm.new(user)

  respond_to do |format|
    if @form.validate(user_params)
      @form.save
      format.html { redirect_to @form, notice: 'User was successfully created.' }
    else
      format.html { render :new }
    end
  end
end

def user_params
  params.require(:user).permit(:name, :region)
end

[DemidenkoAndrey]

@seuros Do you have any update for this issue?

[shadowreplicant]

+1
@DemidenkoAndrey there is skipped test for it

reform-rails/test/active_record_test.rb

Line 54 in c0124fc

skip "replace ActiveModel::Validations with our own, working and reusable gem."

[DemidenkoAndrey]

@shadowreplicant Thank you for mention that. I've added second commit with removing skip from this test