field relationship added

README.md

@@ -477,6 +477,12 @@ client.custom_fields.all
 **QUERY PARAMS** (Optional)
 - limit (integer): The number of fields returned per request.
 
+#### Link a custom field to a list
+
+```ruby
+client.custom_fields.link_to_list(field_id, list_id)
+```
+
 <a name="custom-field-options"/>
 
 ### Custom Fields Options - [Api Reference](https://developers.activecampaign.com/reference#create-custom-field-options)

lib/active_campaign_wrapper/core/custom_field_gateway.rb

@@ -41,6 +41,16 @@ def update(field_id, params)
       def find(field_id)
         @config.get("/fields/#{field_id}")
       end
+
+      def link_to_list(field_id, list_id)
+        params = { field_rel: { field: field_id, relid: list_id } }
+        @config.post(
+          '/fieldRels',
+          body: ActiveCampaignWrapper::Helpers.normalize_body(
+            params
+          )
+        )
+      end
     end
   end
 end

lib/active_campaign_wrapper/version.rb

@@ -1,5 +1,5 @@
 # frozen_string_literal: true
 
 module ActiveCampaignWrapper
-  VERSION = '0.5.1'
+  VERSION = '0.6.0'
 end

spec/lib/active_campaign_wrapper/core/custom_field_gateway_spec.rb

@@ -75,4 +75,16 @@
       expect(response).to eq({})
     end
   end
+
+  describe '#link_to_list', :with_text_field_params, :with_existing_list do
+    subject(:response) { custom_field_gateway.link_to_list(new_custom_field_id, list_id) }
+
+    let!(:new_custom_field_id) do
+      custom_field_gateway.create(field_params).dig(:field, :id)
+    end
+
+    it 'returns a field_rel hash' do
+      expect(response).to include_json(field_rel: { relid: list_id, field: new_custom_field_id })
+    end
+  end
 end