LookupInSpec.exists constructor

LookupInSpec.exists(
  1. Object path, {
  2. bool? xattr,
})

Creates a LookupInSpec for fetching whether a specific field exists in the document.

path must be a String or LookupInMacro.

When xattr is true, this operation references the extended attribute data of the document. Otherwise, it references the document body. Defaults to false.

Implementation

factory LookupInSpec.exists(Object path, {bool? xattr}) =>
    LookupInSpec._create(Opcode.exists, path, xattr: xattr);