Set the payload_example to empty JSON when nil

app/models/alert_management/http_integration.rb

@@ -27,6 +27,7 @@ module AlertManagement
     before_validation :prevent_token_assignment
     before_validation :prevent_endpoint_identifier_assignment
     before_validation :ensure_token
+    before_validation :ensure_payload_example_not_nil
 
     scope :for_endpoint_identifier, -> (endpoint_identifier) { where(endpoint_identifier: endpoint_identifier) }
     scope :active, -> { where(active: true) }
@@ -74,5 +75,9 @@ module AlertManagement
         self.endpoint_identifier = endpoint_identifier_was
       end
     end
+
+    def ensure_payload_example_not_nil
+      self.payload_example ||= {}
+    end
   end
 end

ee/spec/requests/api/graphql/mutations/alert_management/http_integration/update_spec.rb

@@ -88,12 +88,12 @@ RSpec.describe 'Updating an existing HTTP Integration' do
     )
   end
 
-  context 'when the custom mappings attributes are not part of the mutation variables' do
-    let_it_be(:payload_example) do
+  context 'when the integration already has custom mapping params' do
+    let_it_be(:current_payload_example) do
       { 'alert' => { 'name' => 'Test alert', 'desc' => 'Description' } }
     end
 
-    let_it_be(:mapping) do
+    let_it_be(:current_mapping) do
       {
         'title' => { 'path' => %w(alert name), 'type' => 'string', 'label' => 'Title' },
         'description' => { 'path' => %w(alert desc), 'type' => 'string' }
@@ -101,9 +101,48 @@ RSpec.describe 'Updating an existing HTTP Integration' do
     end
 
     let_it_be(:integration) do
-      create(:alert_management_http_integration, project: project, payload_example: payload_example, payload_attribute_mapping: mapping)
+      create(:alert_management_http_integration, project: project, payload_example: current_payload_example, payload_attribute_mapping: current_mapping)
     end
 
+    context 'when the custom mappings attributes are blank' do
+      let(:payload_example) { "{}" }
+      let(:payload_attribute_mappings) { [] }
+
+      it 'resets the custom mapping params', :aggregate_failures do
+        post_graphql_mutation(mutation, current_user: current_user)
+
+        integration_response = mutation_response['integration']
+
+        expect(response).to have_gitlab_http_status(:success)
+        expect(integration_response['id']).to eq(GitlabSchema.id_from_object(integration).to_s)
+        expect(integration_response['name']).to eq('Modified Name')
+
+        integration.reload
+        expect(integration.payload_example).to eq({})
+        expect(integration.payload_attribute_mapping).to eq({})
+      end
+    end
+
+    context 'when the custom mappings attributes are nils' do
+      let(:payload_example) { nil }
+      let(:payload_attribute_mappings) { nil }
+
+      it 'resets the custom mapping params', :aggregate_failures do
+        post_graphql_mutation(mutation, current_user: current_user)
+
+        integration_response = mutation_response['integration']
+
+        expect(response).to have_gitlab_http_status(:success)
+        expect(integration_response['id']).to eq(GitlabSchema.id_from_object(integration).to_s)
+        expect(integration_response['name']).to eq('Modified Name')
+
+        integration.reload
+        expect(integration.payload_example).to eq({})
+        expect(integration.payload_attribute_mapping).to eq({})
+      end
+    end
+
+    context 'when the custom mappings attributes are not part of the mutation variables' do
       let(:mutation) do
         variables = {
           id: GitlabSchema.id_from_object(integration).to_s,
@@ -131,8 +170,9 @@ RSpec.describe 'Updating an existing HTTP Integration' do
         expect(integration_response['name']).to eq('Modified Name')
 
         integration.reload
-      expect(integration.payload_example).to eq(payload_example)
-      expect(integration.payload_attribute_mapping).to eq(mapping)
+        expect(integration.payload_example).to eq(current_payload_example)
+        expect(integration.payload_attribute_mapping).to eq(current_mapping)
+      end
     end
   end
 

spec/models/alert_management/http_integration_spec.rb

@@ -81,6 +81,32 @@ RSpec.describe AlertManagement::HttpIntegration do
     end
   end
 
+  describe 'before validation' do
+    describe '#ensure_payload_example_not_nil' do
+      subject(:integration) { build(:alert_management_http_integration, payload_example: payload_example) }
+
+      context 'when the payload_example is nil' do
+        let(:payload_example) { nil }
+
+        it 'sets the payload_example to empty JSON' do
+          integration.valid?
+
+          expect(integration.payload_example).to eq({})
+        end
+      end
+
+      context 'when the payload_example is not nil' do
+        let(:payload_example) { { 'key' => 'value' } }
+
+        it 'sets the payload_example to specified value' do
+          integration.valid?
+
+          expect(integration.payload_example).to eq(payload_example)
+        end
+      end
+    end
+  end
+
   describe '#token' do
     subject { integration.token }