Learning > presentation > customization > Instance Label Override

InstanceLabelOverride Customization Rule

Based on InstanceLabelOverride interface.

Instance label override rule provides a way to set instance label to one of its property values, other attributes and/or combination of them. If more advanced labels are necessary, there's also a LabelOverride rule which uses ECExpressions to create the label, but costs more performance-wise.

Attributes

Name	Required?	Type	Default	Meaning
Filtering
`requiredSchemas`	No	`RequiredSchemaSpecification[]`	`[]`	Specifications that define schema requirements for the rule to take effect.
`priority`	No	`number`	`1000`	Defines the order in which presentation rules are evaluated.
`onlyIfNotHandled`	No	`boolean`	`false`	Should this rule be ignored if there is already an existing rule with a higher priority.
`class`	Yes	`SingleSchemaClassSpecification`		Specification of the ECClass to apply this rule to.
Overrides
`values`	Yes	`InstanceLabelOverrideValueSpecification[]`		Specifications for the label value. The first non-empty value is used as the actual label.

InstanceLabelOverrideValueSpecification Types and Attributes

Composite

InstanceLabelOverrideCompositeValueSpecification allows creating a label value composited using multiple other specifications.

Name	Required?	Type	Default	Meaning
`parts`	Yes	`Array<{ spec: InstanceLabelOverrideValueSpecification; isRequired?: boolean }>`		Parts of the value. If any of the parts with `isRequired` flag evaluate to an empty string, the result of this specification is also an empty string.
`separator`	No	`string`	Space character	Separator to use when joining the parts.

Property

InstanceLabelOverridePropertyValueSpecification uses property value as the label content.

Name	Required?	Type	Default	Meaning
`propertyName`	Yes	`string`		Name of the property whose value should be used.
`propertySource`	No	`RelationshipPathSpecification`	Empty path	Specification of the relationship path from `InstanceLabelOverride.class` to class of the property.

String

InstanceLabelOverrideStringValueSpecification uses the specified value as the label content.

Name	Required?	Type	Default	Meaning
`value`	Yes	`string`		The value to use as the label content.

ClassName

InstanceLabelOverrideClassNameSpecification uses ECClass name as the label content.

Name	Required?	Type	Default	Meaning
`full`	No	`boolean`	`false`	Should full (`{schemaName}.{className}`) class name be used.

ClassLabel

InstanceLabelOverrideClassLabelSpecification uses ECClass display label as the label content. It has no additional attributes.

BriefcaseId

InstanceLabelOverrideBriefcaseIdSpecification returns ECInstance's briefcase ID in base36 format. It has no additional attributes.

LocalId

InstanceLabelOverrideLocalIdSpecification returns ECInstance's local ID in base36 format. It has no additional attributes.

RelatedInstanceLabel

InstanceLabelOverrideRelatedInstanceLabelSpecification uses label of another related instance as the label content.

Name	Required?	Type	Default	Meaning
`pathToRelatedInstance`	Yes	`RelationshipPathSpecification`		Specification of the relationship path from `InstanceLabelOverride.class` to class of the related instance.

Example

The above override takes effect on all MySchema.MyClass ECInstances. First, it attempts to use MyProperty1 value as the label. If that's not set, then it uses {class_label} [{briefcase_id}-{local_id}] label.

{
  "ruleType": "InstanceLabelOverride",
  "priority": 999,
  "requiredSchemas": [{ "name": "MySchema", "minVersion": "1.2.3" }],
  "class": { "schemaName": "MySchema", "className": "MyClass" },
  "values": [{
    "specType": "Property",
    "propertyName": "MyProperty1"
  }, {
    "specType": "Composite",
    "separator": " ",
    "parts": [
      {
        "spec": {
          "specType": "ClassLabel"
        },
        "isRequired": true
      },
      {
        "spec": {
          "specType": "Composite",
          "separator": "",
          "parts": [
            {
              "spec": {
                "specType": "String",
                "value": "["
              }
            },
            {
              "spec": {
                "specType": "BriefcaseId"
              }
            },
            {
              "spec": {
                "specType": "String",
                "value": "-"
              }
            },
            {
              "spec": {
                "specType": "LocalId"
              }
            },
            {
              "spec": {
                "specType": "String",
                "value": "]"
              }
            }
          ]
        }
      }
    ]
  }]
}

Last Updated: 29 November, 2022