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# 1.ManyToOne功能增强

## 1.ManyToOne不需要填写依赖和允许跨App安装
1. 如果是模型的ManyToOne依赖,app.json不需要填写应用依赖
2. 如果2个APP不存在继承扩展,只存在调用关系或者模型的many2one引用,可以不安装在一起
3. **注意:如果模型之前存在继承扩展关系,必须安装在一起**

1.@ManyToOne 指定targetModel的格式为 appName.modelName
```java
@Model
public class TestLog extends BaseModel {
   
    @ManyToOne(targetModel = "newSdkApp.TestOrg")// Many2one跨app安装,格式为:其他app的名字.模型名
    @JoinColumn(name = "org_code")
    private Map<String, Object> testOrg;

}
```

2.如果需要再ManyToOne方添加tab页显示另外一个app的数据,需要再tabs的body里面指定	"app": "newSdkAppOthers"

```json
"tabs": [
	{
		"body": {
			"columns": [
				{
					"label": "备注",
					"name": "remark"
				},
				{
					"label": "创建时间",
					"name": "createDate"
				}
			],
			"app": "newSdkAppOthers",
			"field": "testLogs",
			"type": "grid"
		},
		"header": "日志列表",
		"tbar": []
	}
]
```

## 2.ManyToOne指定任意的显示字段

之前的ManyToOne默认只能是 displayForModel字段,现在已经修改成支持任意字段的显示

**通过注解displayFormat指定任意显示的字段(指定的字段必须是存在数据库中的,不能是related字段):**

**指定任意字段:**

```java
@ManyToOne(displayName = "2单选异步获取Many2one", cascade = {CascadeType.DEL_SET_NULL},displayFormat ="orgCode")
@ManyToOne(displayName = "2单选异步获取Many2one", cascade = {CascadeType.DEL_SET_NULL},displayFormat ="${orgCode}")
```

**指定多个字段格式化输出:**
```java
@ManyToOne(displayName = "2单选异步获取Many2one", cascade = {CascadeType.DEL_SET_NULL},displayFormat ="${name}-${orgCode}")
```

## 3.ManyToOne关联非ID字段,比如关联code字段

之前的ManyToOne默认只能是关联ID字段,现在可以关联code等非ID字段
示例

**通过注解referencedProperty指定任意字段:**

```java
   @ManyToOne(displayName = "2单选异步获取Many2one", cascade = {CascadeType.DEL_SET_NULL})
    @JoinColumn(name = "org_id", referencedProperty = "orgCode")
    private TestOrg org;
    
    //引擎内置的base app的模型可以不指定app
    @ManyToOne(displayName = "组织", targetModel = "rbac_organization") 
    @JoinColumn(name = "org_code", referencedProperty = "code")
    private Map<String, Object> organization;
    
    //如果明确知道是跨app安装,需要指定app.modelname,
    @ManyToOne(displayName = "组织", targetModel = "mbm-main.res_enterprise")
    @JoinColumn(name = "org_code", referencedProperty = "code")
    private Map<String, Object> enterprise;
    
```

## 4.ManyToOne和ManyToMany支持related属性显示

```java
  4.1.Many2one的用法 ,不需要使用select属性

@@Model(name = "TestUser", description = "用户")
public class TestUser extends BaseModel<TestUser> {
    @ManyToOne(displayName = "组织")
    @JoinColumn(name = "org_id", referencedProperty = "id")
    private TestOrg org;
    
}

@Model(name = "TestOrg", description = "组织")
public class TestOrg extends BaseModel<TestOrg> {

@Property(displayName = "名称")
    private String name;

@ManyToOne
    @JoinColumn(name = "parent_id")
    private TestOrg parent;
    
   
    @Property(displayName = "父组织",related = "parent.name",displayForModel = true)
    private String parentName;
}

4.2.ManyToMany

@ManyToMany
        @JoinTable(name = "role_user", joinColumns = @JoinColumn(name = "user_id", nullable = false),
                        inverseJoinColumns = @JoinColumn(name = "role_id", nullable = false))
        @Selection(multiple = true,properties = "parentNmae")
        @Property(displayName = "角色")
        private List<TestRole> roleList;

@Model
public class TestRole extends BaseModel {

@Property(columnName = "role_name", displayName = "角色名称")
    private String roleName;

@ManyToOne
    @JoinColumn(name = "parent_id")
    private TestOrg parent;
    
   
    @Property(displayName = "父组织",related = "parent.name")
    private String parentNmae;
    
        }
    
```

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