Adds the reverse indicator from the relation type if it is not already present.
A reversed relation means the relation is considered from the object entity
point of view.
The reverse indicator is a prefix added as a convention in CubicWeb.
Parameters
relationType: string
The relation type to transform
Returns string
The relation type with the reverse indicator added or removed
Adds the reverse indicator from the relation type if it is not already present.
A reversed relation means the relation is considered from the object entity point of view. The reverse indicator is a prefix added as a convention in CubicWeb.