FIX: registered topic field names not being cast properly in actions

lib/custom_wizard/action.rb

@@ -481,8 +481,8 @@ class CustomWizard::Action
 
         registered = registered_fields.select { |f| f.name == name }.first
         if registered.present?
-          klass = registered.klass
+          klass = registered.klass.to_sym
-          type = registered.type
+          type = registered.type.to_sym
         end
 
         next if type === :json && json_attr.blank?

spec/components/custom_wizard/action_spec.rb

@@ -21,6 +21,20 @@ describe CustomWizard::Action do
     )
   }
 
+  let(:create_topic) {
+    JSON.parse(
+      File.open(
+        "#{Rails.root}/plugins/discourse-custom-wizard/spec/fixtures/actions/create_topic.json"
+      ).read
+    )
+  }
+
+  let(:custom_field_json) {
+    JSON.parse(File.open(
+      "#{Rails.root}/plugins/discourse-custom-wizard/spec/fixtures/custom_field/custom_fields.json"
+    ).read)
+  }
+
   before do
     Group.refresh_automatic_group!(:trust_level_2)
     CustomWizard::Template.save(wizard_template, skip_jobs: true)
@@ -107,6 +121,40 @@ describe CustomWizard::Action do
       expect(topic_json_custom_field.exists?).to eq(true)
       expect(post_custom_field.exists?).to eq(true)
     end
+
+    it "adds registered custom fields" do
+      custom_field = custom_field_json['custom_fields'][0]
+      custom_field_name = custom_field["name"]
+      custom_field_value = "Custom value"
+
+      CustomWizard::CustomField.new(nil, custom_field).save
+      create_topic["custom_fields"] = [
+        {
+          "type": "association",
+          "pairs": [
+            {
+              "index": 0,
+              "key": custom_field_name,
+              "key_type": "custom_field",
+              "value": custom_field_value,
+              "value_type": "text",
+              "connector": "association"
+            }
+          ]
+        }
+      ]
+
+      wizard = CustomWizard::Wizard.new(@template, user)
+      action = CustomWizard::Action.new(
+        wizard: wizard,
+        action: create_topic.with_indifferent_access,
+        submission: wizard.current_submission
+      )
+      action.perform
+
+      expect(action.result.success?).to eq(true)
+      expect(TopicCustomField.exists?(name: custom_field_name, value: custom_field_value)).to eq(true)
+    end
   end
 
   context 'sending a message' do

spec/fixtures/actions/create_topic.json

@@ -0,0 +1,14 @@
+{
+  "id": "create_topic_1",
+  "type": "create_topic",
+  "post_builder": true,
+  "post_template": "First post in the topic!",
+  "title": [
+    {
+      "type": "assignment",
+      "output_type": "text",
+      "output_connector": "set",
+      "output": "My new topic"
+    }
+  ]
+}