如何使用具有实体数组的实体来实现此symfony表单？(how to implement this symfony form, with a entity which has a array of entities?)

 在这个例子中，这个用例已经有一些代码。 
 
 providers: [{provide: TEST_VALUE, useValue: 'Just an example'}], 
 
 你可以用它来注入字符串Just an example到LoginDialogComponent 。 
 
 在你必须按照以下方式初始化TEST_VALUE之前： 
 
const TEST_VALUE = new OpaqueToken("test_value");
 
 然后，您可以通过这种方式扩展组件构造函数以获取值： 
 
constructor(@Inject(TEST_VALUE) private myValue: string) {}
 
 要么 
 
 你也可以传递一个对象来代替字符串。 这看起来是这样的： 
 
providers: [{provide: TEST_VALUE, useValue: <IMyDialogArgs>{
    foo: "foo",
    bar: 0
}}],

In the example there is already some code for this use-case.
 
providers: [{provide: TEST_VALUE, useValue: 'Just an example'}],
 
You can use this to inject the string Just an example into the construtor of LoginDialogComponent.
 
Before you have to initialize TEST_VALUE the following way:
 
const TEST_VALUE = new OpaqueToken("test_value");
 
Then you can extend your components constructor this way to get the value:
 
constructor(@Inject(TEST_VALUE) private myValue: string) {}
 
Or
 
Instead of a string you can also pass an object. This would look this way:
 
providers: [{provide: TEST_VALUE, useValue: <IMyDialogArgs>{
    foo: "foo",
    bar: 0
}}],