Class: Pakyow::Form::Framework

Inherits:
Object
  • Object
show all
Defined in:
lib/pakyow/form/framework.rb

Instance Method Summary collapse

Instance Method Details

#boot ⇒ Object 



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# File 'lib/pakyow/form/framework.rb', line 15

def boot
  object.class_eval do
    isolated :Controller do
      # Clear form errors after a successful submission.
      #
      after "dispatch" do
        if connection.form && connection.status < 400
          data.ephemeral(:errors, form_id: connection.form[:id]).set([])
        end
      end
    end

    isolated :Connection do
      include Pakyow::Application::Connection::Helpers::Form
    end

    handle InvalidData, as: :bad_request do |error|
      if connection.form && connection.form.include?(:origin)
        raw_messages = case error.result
        when Verifier::Result
          error.result.messages(type: :presentable)
        else
          error.result.messages
        end

        errors = case raw_messages
        when Array
          raw_messages.map { |message|
            { message: message }
          }
        when Hash
          raw_messages.flat_map { |type, messages|
            case messages
            when Array
              messages.map { |type_message|
                { field: type, message: type_message }
              }
            when Hash
              messages.flat_map { |field, field_messages|
                field_messages.map { |field_message|
                  { field: field, message: field_message }
                }
              }
            end
          }
        end

        if app.class.includes_framework?(:ui) && ui?
          data.ephemeral(:errors, form_id: connection.form[:id]).set(errors)
        else
          connection.set(:__form_errors, errors)
          connection.set(:__form_values, params.reject { |key| key == :form })
          reroute connection.form[:origin], method: :get, as: :bad_request
        end
      else
        reject
      end
    end

    component :form do
      def perform
        errors = if connection.values.include?(:__form_errors)
          connection.get(:__form_errors)
        else
          []
        end

        # We have to take over the management of form ids from presenter for error handling.
        # If we're re-rendering a submitted form we reuse the id, otherwise create a new one.
        #
        form_id = if connection.form
          connection.form[:id]
        else
          SecureRandom.hex(24)
        end

        expose :form_id, form_id

        # Relate ephemeral errors to the form id.
        #
        expose :form_errors, data.ephemeral(:errors, form_id: form_id).set(errors)

        # Expose submitted values to be presented in the form.
        #
        connection.get(:__form_values).to_h.each do |key, value|
          expose connection.form[:binding], value
        end
      end

      presenter do
        render do
          view.label(:form)[:id] = form_id
          presented_form_binding = presentables.dig(:__form, :binding)
          if presented_form_binding.nil? || presented_form_binding.to_sym == view.channeled_binding_name
            classify_form; classify_fields
            present_errors(form_errors)
          end
        end

        private

        def classify_form
          if form_errors.any?
            attrs[:class] << :"ui-errored"
          else
            attrs[:class].delete(:"ui-errored")
          end
        end

        def classify_fields
          view.each_binding_prop do |node|
            binding_name = node.label(:binding)
            error = form_errors.find { |e| e[:field] == binding_name }

            find(binding_name).with do |field|
              if error.nil?
                field.attrs[:class].delete(:"ui-errored")
                field.attrs[:title] = ""
              else
                field.attrs[:class] << :"ui-errored"
                field.attrs[:title] = error[:message]
              end
            end
          end
        end

        def present_errors(errors)
          if form_errors_presenter = component(:"form-errors")
            if error_presenter = form_errors_presenter.find(:error)
              error_presenter.present(errors)
            end

            if errors.empty?
              form_errors_presenter.attrs[:class] << :"ui-hidden"
            else
              form_errors_presenter.attrs[:class].delete(:"ui-hidden")
            end
          end
        end
      end
    end
  end
end