feat: add make method to create a new model instance

Author: kiaking

src/repository/Repository.ts

@@ -94,6 +94,17 @@ export class Repository<M extends Model> {
     return this.query().find(ids)
   }
 
+  /**
+   * Create a new model instance. This method will not save the model to the
+   * store. It's pretty much the alternative to `new Model()`, but it injects
+   * the store instance to support model instance methods in SSR environment.
+   */
+  make(attributes?: Element): M {
+    return this.model.$newInstance(attributes, {
+      relations: false
+    })
+  }
+
   /**
    * Insert the given record to the store.
    */

test/unit/repository/Repository.spec.ts

@@ -0,0 +1,34 @@
+import { createStore, assertModel } from 'test/Helpers'
+import { Model, Attr, Str } from '@/index'
+
+describe('unit/repository/Repository', () => {
+  class User extends Model {
+    static entity = 'users'
+
+    @Attr() id!: any
+    @Str('John Doe') name!: string
+  }
+
+  it('creates a new model instance', () => {
+    const store = createStore([User])
+
+    const user = store.$repo(User).make()
+
+    expect(user).toBeInstanceOf(User)
+    expect(user.$store).toBe(store)
+    assertModel(user, { id: null, name: 'John Doe' })
+  })
+
+  it('creates a new model instance with default values', () => {
+    const store = createStore([User])
+
+    const user = store.$repo(User).make({
+      id: 1,
+      name: 'Jane Doe'
+    })
+
+    expect(user).toBeInstanceOf(User)
+    expect(user.$store).toBe(store)
+    assertModel(user, { id: 1, name: 'Jane Doe' })
+  })
+})