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Version: v20 R4 BETA

$attributes

Allows selecting the related attribute(s) to get from the dataclass (e.g., Company(1)?$attributes=employees.lastname or Employee?$attributes=employer.name).

Description​

When you have relation attributes in a dataclass, use $attributes to define the path of attributes whose values you want to get for the related entity or entities.

You can apply $attributes to an entity (e.g., People(1)) or an entity selection (e.g., People/$entityset/0AF4679A5C394746BFEB68D2162A19FF) .

  • If $attributes is not specified in a query, or if the "*" value is passed, all available attributes are extracted. Related entity attributes are extracted with the simple form: an object with property __KEY (primary key) and URI. Related entities attributes are not extracted.

  • If $attributes is specified for related entity attributes:

    • $attributes=relatedEntity: the related entity is returned with simple form (deferred __KEY property (primary key)) and URI.
    • $attributes=relatedEntity.*: all the attributes of the related entity are returned
    • $attributes=relatedEntity.attributePath1, relatedEntity.attributePath2, ...: only those attributes of the related entity are returned.
  • If $attributes is specified for related entities attributes:
    • $attributes=relatedEntities.*: all the properties of all the related entities are returned
    • $attributes=relatedEntities.attributePath1, relatedEntities.attributePath2, ...: only those attributes of the related entities are returned.

If we pass the following REST request for our Company dataclass (which has a relation attribute "employees"):

GET /rest/Company(1)/?$attributes=employees.lastname

Response:

{
    "__entityModel": "Company",
    "__KEY": "1",  
    "__TIMESTAMP": "2018-04-25T14:41:16.237Z",
    "__STAMP": 2,
    "employees": {
        "__ENTITYSET": "/rest/Company(1)/employees?$expand=employees",
        "__GlobalStamp": 50,
        "__COUNT": 135,
        "__FIRST": 0,
        "__ENTITIES": [
            {
                "__KEY": "1",
                "__TIMESTAMP": "2019-12-01T20:18:26.046Z",
                "__STAMP": 5,
                "lastname": "ESSEAL"
            },
            {
                "__KEY": "2",
                "__TIMESTAMP": "2019-12-04T10:58:42.542Z",
                "__STAMP": 6,
                "lastname": "JONES"
            },
            ...
    }
}

If you want to get all attributes from employees:

GET /rest/Company(1)/?$attributes=employees.*

If you want to get last name and job name attributes from employees:

GET /rest/Company(1)/?$attributes=employees.lastname,employees.jobname

If we pass the following REST request for our Employee dataclass (which has several relation attributes, including "employer"):

GET /rest/Employee(1)?$attributes=employer.name

Response:

{
    "__entityModel": "Employee",
    "__KEY": "1",
    "__TIMESTAMP": "2019-12-01T20:18:26.046Z",
    "__STAMP": 5,
    "employer": {
        "__KEY": "1",
        "__TIMESTAMP": "2018-04-25T14:41:16.237Z",
        "__STAMP": 0,
        "name": "Adobe"
    }
}

If you want to get all attributes of the employer:

GET /rest/Employee(1)?$attributes=employer.*

If you want to get the last names of all employees of the employer:

GET /rest/Employee(1)?$attributes=employer.employees.lastname