(Quick Reference)
get
Returns an instance of the object specified by the provided id, or
null if no such object exists. The specified
arguments can be either the
id string (i.e. the value of the
id object property) or the primary key(s) of the
object.
Arguments
| Name | Required | Description |
|---|
| identifier | yes | primary key or ident() value |
| cascade | no | true causes any belonging to this object to be deleted along with the object itself |
| cluster | no | name of the cluster (as specified in the configuration) from which to retrieve the object |
| consistencyLevel | no | "CL_ONE", "CL_LOCAL_QUORUM", "CL_QUORUM", or "CL_ALL" |
Examples
Single string primary key
Given the class:
class Person
{
String username
static cassandraMapping = [
primaryKey: 'username'
]
}Retrieve an object by specifying the primary key, which is also the value returned by
person.id:
def person = Person.get("joeuser")Time based UUID primary key
Given the class:
class Post
{
UUID uuid
static cassandraMapping = [
primaryKey: 'uuid'
]
}Retrieve an object by specify a UUID value:
def post = Post.get("5f5d32e0-1177-11e2-ac9f-001c42000009".toUUID())or the string value returned by the
post.id value:
def post = Post.get("001349721517326_5f5d32e0-1177-11e2-ac9f-001c42000009")Composite primary key
Given the class:
class Like
{
Long postId
Long userId
static cassandraMapping = [
primaryKey: ['postId','userId'],
]
}Retrieve an object by specifying a list of the primary key values:
def like = Like.get([1001,1002])
or by specifying the string returned by
.id:
def like = Like.get("1001_1002")