Service model: Refactor build_from_template

This makes build_from_template agnostic from templates, so now we are
able to pass a template or an instance-level service.

app/models/project.rb

@@ -1273,7 +1273,7 @@ class Project < ApplicationRecord
     template = find_service(services_templates, name)
 
     if template
-      Service.build_from_template(id, template)
+      Service.build_from_integration(id, template)
     else
       public_send("build_#{name}_service") # rubocop:disable GitlabSecurity/PublicSend
     end

app/models/service.rb

@@ -335,15 +335,16 @@ class Service < ApplicationRecord
     services_names.map { |service_name| "#{service_name}_service".camelize }
   end
 
-  def self.build_from_template(project_id, template)
-    service = template.dup
+  def self.build_from_integration(project_id, integration)
+    service = integration.dup
 
-    if template.supports_data_fields?
-      data_fields = template.data_fields.dup
+    if integration.supports_data_fields?
+      data_fields = integration.data_fields.dup
       data_fields.service = service
     end
 
     service.template = false
+    service.instance = false
     service.project_id = project_id
     service.active = false if service.active? && service.invalid?
     service

app/services/projects/create_service.rb

@@ -178,7 +178,7 @@ module Projects
     # rubocop: disable CodeReuse/ActiveRecord
     def create_services_from_active_templates(project)
       Service.where(template: true, active: true).each do |template|
-        service = Service.build_from_template(project.id, template)
+        service = Service.build_from_integration(project.id, template)
         service.save!
       end
     end

spec/fixtures/trace/sample_trace

@@ -2736,9 +2736,6 @@ Service
       when repository is empty
         test runs execute
   Template
-    .build_from_template
-      when template is invalid
-        sets service template to inactive when template is invalid
     for pushover service
       is prefilled for projects pushover service
         has all fields prefilled

spec/models/service_spec.rb

@@ -264,13 +264,13 @@ describe Service do
       end
     end
 
-    describe '.build_from_template' do
+    describe '.build_from_integration' do
       context 'when template is invalid' do
         it 'sets service template to inactive when template is invalid' do
           template = build(:prometheus_service, template: true, active: true, properties: {})
           template.save(validate: false)
 
-          service = described_class.build_from_template(project.id, template)
+          service = described_class.build_from_integration(project.id, template)
 
           expect(service).to be_valid
           expect(service.active).to be false
@@ -293,7 +293,7 @@ describe Service do
 
         shared_examples 'service creation from a template' do
           it 'creates a correct service' do
-            service = described_class.build_from_template(project.id, template)
+            service = described_class.build_from_integration(project.id, template)
 
             expect(service).to be_active
             expect(service.title).to eq(title)
@@ -302,6 +302,8 @@ describe Service do
             expect(service.api_url).to eq(api_url)
             expect(service.username).to eq(username)
             expect(service.password).to eq(password)
+            expect(service.template).to eq(false)
+            expect(service.instance).to eq(false)
           end
         end
 

spec/services/projects/propagate_service_template_spec.rb

@@ -62,8 +62,8 @@ describe Projects::PropagateServiceTemplate do
         }
       )
 
-      Service.build_from_template(project.id, service_template).save!
-      Service.build_from_template(project.id, other_service).save!
+      Service.build_from_integration(project.id, service_template).save!
+      Service.build_from_integration(project.id, other_service).save!
 
       expect { described_class.propagate(service_template) }
         .not_to change { Service.count }