ClassMetadata::addConstraint()

Adds a constraint.

If the constraint {@link Valid} is added, the cascading strategy will be changed to {@link CascadingStrategy::CASCADE}. Depending on the $traverse property of that constraint, the traversal strategy will be set to one of the following:

• {@link TraversalStrategy::IMPLICIT} if $traverse is enabled
• {@link TraversalStrategy::NONE} if $traverse is disabled