Autogenerated IDs in an entity

Learn about the unique IDs you can have Reltio automatically generated for simple and nested attributes.

The modifications for auto-generated IDs for reference attributes are described in the subsequent section. The following table describes how UUID and sequential IDs are generated.

Table 1. Parameters
Parameter	Required	Description
`name`	yes	Name of the generator. It must be unique across the environment.
`type`	yes	Can be 'UUID' or 'SEQUENTIAL'.
`rangestart`	no	The starting value in the sequence. If omitted, the default is 0. Can be applied only to SEQUENTIAL generators.
`step`	no	The increment. If omitted, the default is 1. Can be applied only to SEQUENTIAL generators.
`uuidversion`	yes, if type is UUID	The version of UUIDs. Must be 4 (random UUIDs). Can be applied only to UUID generators.

The feature uses the following properties:

Table 2. Properties
Option	Applies To	Description	Default Value
`autoGenerated`	Attribute/Source	If `true`, the value of attribute/crosswalk will be auto-generated. Use this to enable the feature.	`False`
`generateIfEmpty`	Attribute	If `true`, the value will be generated only if a value is not sent in the request. Note: You must send an empty string to generate a value. A null value is not considered empty string and will not generate a value. .	`False`
`generateIfNotEmpty`	Attribute	If `true`, the value will be generated even if a value is sent in the request.	True
`generatedValueUniqueForCrosswalk`	Attribute	If `true`, existing value by crosswalk will be reused instead of generating a new one.	`False`
`generator`	Attribute/source	The generator name.	None
`autoGenerationPattern`	Simple attribute/source	`{value}` will be substituted by generated value.	None
`autoGenerationNestedPattern`	Nested attribute	Used to specify auto-generated patterns for sub-attributes	None
`uniqueGeneratedValuePerEntityPerRequest`	Entity	If `true`, only one value will be generated for all auto-generated attribute/crosswalk values per entity per request.	`False`

Note: New values will be generated only for data provider crosswalks but will not be generated for crosswalks with the dataProvider=false option.

Here is the behavior for the obvious combinations of Boolean settings and the existing data.

generateIfEmpty = True and generatedValueUniqueForCrosswalk= True:


Value was Sent	Value by Crosswalk Exists	Reaction
Yes	Yes	Reuse existing value.
Yes	No	Generate new value and use it instead of the value that was sent.
No	Yes	Reuse existing value.
No	No	Generate new value.

generateIfEmpty = True


Value was Sent	Value by Crosswalk Exists	Reaction
Yes	Doesn't matter	Generate new value and use it instead of the value that was sent.
No	Doesn't matter	Generate new value.

 generatedValueUnique for Crosswalk = True


Value was Sent	Value by Crosswalk Exists	Reaction
Yes	Yes	Reuse existing value.
Yes	No	Generate new value and use it instead of the value that was sent.
No	Doesn't Matter	Don't generate a value.

None (Neither Boolean setting set to True)


Value was Sent	Value by Crosswalk Exists	Reaction
Yes	Doesn't Matter.	Generate new value and use it instead of value that was sent
No	Doesn't Matter	Don't generate a value

If you specify the value for any auto generated field in the above table as null, it is treated as not-empty. If you have specified the null value, but also want to auto-generate the value, ensure the generateIfNotEmpty field is true.

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Autogenerated IDs in an entity

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