feat: add relativePathFromServiceToModel utility fn

npm/ng-packs/packages/schematics/src/utils/index.ts

@@ -2,6 +2,7 @@ export * from './angular';
 export * from './ast';
 export * from './common';
 export * from './namespace';
+export * from './path';
 export * from './rule';
 export * from './service';
 export * from './source';

npm/ng-packs/packages/schematics/src/utils/path.ts

@@ -0,0 +1,11 @@
+import { dir } from './text';
+
+export function relativePathFromServiceToModel(serviceNamespace: string, modelNamespace: string) {
+  const repeats = serviceNamespace ? serviceNamespace.split('.').length : 0;
+  const path = '..' + '/..'.repeat(repeats) + '/models/' + dir(modelNamespace);
+  return removeTrailingSlash(path);
+}
+
+function removeTrailingSlash(path: string) {
+  return path.replace(/\/+$/, '');
+}