API Reference > ecschema-Metadata > Metadata > RelationshipConstraint RelationshipConstraint Class Beta A Typescript class representation of a ECRelationshipConstraint. Implements CustomAttributeContainerProps Methods Name Description constructor(relClass: RelationshipClass, relEnd: RelationshipEnd, roleLabel?: string, polymorphic?: boolean): RelationshipConstraint addClass(constraint: EntityClass | Mixin | RelationshipClass): void Adds the provided class as a constraint class to this constraint. addCustomAttribute(customAttribute: CustomAttribute): void Protected deserialize(relationshipConstraintProps: RelationshipConstraintProps): Promise<void> Deprecated deserializeSync(relationshipConstraintProps: RelationshipConstraintProps): void Deprecated fromJSON(relationshipConstraintProps: RelationshipConstraintProps): Promise<void> fromJSONSync(relationshipConstraintProps: RelationshipConstraintProps): void supportsClass(ecClass: ECClass): Promise<boolean> Indicates if the provided ECClass is supported by this RelationshipConstraint. toJSON(): RelationshipConstraintProps Save this RelationshipConstraint's properties to an object for serializing to JSON. toJson(): void Deprecated classCompatibleWithConstraint(constraintClass: ECClass, testClass: ECClass, isPolymorphic: boolean): Promise<boolean> Static Indicates if an ECClass is of the type or applies to the type (if a mixin) of the ECClass specified by the constraintClass parameter. Properties Name Type Description _abstractConstraint Protected undefined | LazyLoadedRelationshipConstraintClass _constraintClasses Protected undefined | LazyLoadedRelationshipConstraintClass[] _multiplicity Protected undefined | RelationshipMultiplicity _polymorphic Protected undefined | boolean _relationshipClass Protected RelationshipClass _relationshipEnd Protected RelationshipEnd _roleLabel Protected undefined | string abstractConstraint Accessor undefined | LazyLoadedRelationshipConstraintClass constraintClasses Accessor ReadOnly undefined | LazyLoadedRelationshipConstraintClass[] customAttributes Accessor ReadOnly undefined | CustomAttributeSet fullName Accessor ReadOnly string Returns the constraint name, ie. isSource Accessor ReadOnly boolean True if this RelationshipConstraint is the Source relationship end. multiplicity Accessor ReadOnly undefined | RelationshipMultiplicity polymorphic Accessor ReadOnly undefined | boolean relationshipClass Accessor ReadOnly RelationshipClass relationshipEnd Accessor ReadOnly RelationshipEnd roleLabel Accessor ReadOnly undefined | string schema Accessor ReadOnly Schema Returns the schema of the RelationshipClass. Defined in core/ecschema-metadata/src/Metadata/RelationshipClass.ts Line 131 Last Updated: 29 November, 2022