update the path_to_root of a concept methods to use custom roots

[Syphax bouazzouni]

Context

The /tree endpoint of a concept gives the path that takes the concept to reach one the roots of the resource. This endpoint is using to achieve that a function called path_to_root.

Issue

The path_to_root method was testing that it reached the root, if the tested concept has no more parents or is owl:Thing. The problem is that with

• #22

The roots are no more only the concepts that doesn't have parents, but it depends also of the used schemes.

Requirement

• Update path_to_root, is root test like so : concept.is_root? = concept.parents.empty? OR schemes_roots.contain?(concept)

Deployment

• testportal
• stageportal
• agroportal
• bioportal

[Syphax bouazzouni]

Done

Tree without a concept_schemes

Tree with concept_schemes