Setup of documents view

eveai_app/models/document.py

@@ -27,6 +27,7 @@ class DocumentLanguage(db.Model):
     id = db.Column(db.Integer, primary_key=True)
     document_id = db.Column(db.Integer, db.ForeignKey(Document.id), nullable=False)
     language = db.Column(db.String(2), nullable=False)
+    latest_version_id = db.Column(db.Integer, db.ForeignKey('document_version.id'), nullable=True)
 
     # Versioning Information
     created_at = db.Column(db.DateTime, nullable=False, server_default=db.func.now())
@@ -35,7 +36,17 @@ class DocumentLanguage(db.Model):
     updated_by = db.Column(db.Integer, db.ForeignKey(User.id))
 
     # Relations
-    versions = db.relationship('DocumentVersion', backref='document_language', lazy=True)
+    versions = db.relationship(
+        'DocumentVersion',
+        backref='document_language',
+        lazy='joined',
+        foreign_keys='DocumentVersion.doc_lang_id'
+    )
+    latest_version = db.relationship(
+        'DocumentVersion',
+        uselist=False,
+        foreign_keys=[latest_version_id]
+    )
 
     def __repr__(self):
         return f"<DocumentLanguage {self.document_id}.{self.language}>"