fix: REST API one-to-one relationship

[dpgaspar]

Description

Fixes ModelRestApi one to one relation when it's defined like:

class Child(Model):
    id = Column(Integer, primary_key=True)
    name = Column(String(50), unique=True, nullable=False)
    parent_id = Column(Integer, ForeignKey("contact.id"))
    parent = relationship("Parent", back_populates="child")

class Parent(Model):
    id = Column(Integer, primary_key=True)
    name = Column(String(150), unique=True, nullable=False)
    child = relationship("Child", back_populates="parent", uselist=False)

@hughhhh

ADDITIONAL INFORMATION

• Has associated issue:
• Is CRUD MVC related.
• Is Auth, RBAC security related.
• Changes the security db schema.
• Introduces new feature
• Removes existing feature