Batch Get methods: Parent field

This rule enforces that all BatchGet methods have a string parent field in the request message, as mandated in AIP-231.

Details

This rule looks at any message matching BatchGet*Request and complains if either the parent field is missing, or if it has any type other than string.

Examples

Incorrect code for this rule:

// Incorrect.
message BatchGetBooksRequest {
  string publisher = 1;  // Field name should be `parent`.

  repeated string names = 2 [
    (google.api.field_behavior) = REQUIRED,
    (google.api.resource_reference).type = "library.googleapis.com/Book"
  ];
}

// Incorrect.
message BatchGetBooksRequest {
  bytes parent = 1;  // Field type should be `string`.

  repeated string names = 2 [
    (google.api.field_behavior) = REQUIRED,
    (google.api.resource_reference).type = "library.googleapis.com/Book"
  ];
}

Correct code for this rule:

// Correct.
message BatchGetBooksRequest {
  string parent = 1 [
    (google.api.resource_reference).child_type = "library.googleapis.com/Book"
  ];

  repeated string names = 2 [
    (google.api.field_behavior) = REQUIRED,
    (google.api.resource_reference).type = "library.googleapis.com/Book"
  ];
}

Disabling

If you need to violate this rule, use a leading comment above the message (if the parent field is missing) or above the field (if it is the wrong type). Remember to also include an aip.dev/not-precedent comment explaining why.

// (-- api-linter: core::0231::request-parent-field=disabled
//     aip.dev/not-precedent: We need to do this because reasons. --)
message BatchGetBooksRequest {
  string publisher = 1;  // Field name should be `parent`.

  repeated string names = 2 [
    (google.api.field_behavior) = REQUIRED,
    (google.api.resource_reference).type = "library.googleapis.com/Book"
  ];
}

If you need to violate this rule for an entire file, place the comment at the top of the file.