models: improve IneractiveSession model

reana_db/models.py

@@ -286,23 +286,20 @@ class JobStatus(enum.Enum):
     queued = 5
 
 
-class UserWorkflowSession(Base, Timestamp):
-    """User Workflow Session table."""
+class WorkflowSession(Base):
+    """Workflow Session table."""
 
-    __tablename__ = "user_workflow_session"
+    __tablename__ = "workflow_session"
     __table_args__ = {"schema": "__reana"}
 
-    user_id = Column(UUIDType, ForeignKey("__reana.user_.id_"), nullable=False)
     workflow_id = Column(UUIDType, ForeignKey("__reana.workflow.id_"), nullable=True)
     session_id = Column(
         UUIDType, ForeignKey("__reana.interactive_session.id_"), primary_key=True
     )
 
     def __repr__(self):
-        """User Workflow Session string representation."""
-        return "<UserWorkflowSession {} {} {}>".format(
-            self.user_id, self.session_id, self.workflow_id
-        )
+        """Workflow Session string representation."""
+        return "<WorkflowSession {} {}>".format(self.session_id, self.workflow_id)
 
 
 class InteractiveSessionType(enum.Enum):
@@ -318,9 +315,7 @@ class InteractiveSession(Base, Timestamp):
     id_ = Column(UUIDType, primary_key=True, unique=True, default=generate_uuid)
     name = Column(String(255))
     path = Column(Text)  # path to access the interactive session
-    status = Column(
-        Enum(RunStatus), nullable=False, default=RunStatus.created
-    )
+    status = Column(Enum(RunStatus), nullable=False, default=RunStatus.created)
     owner_id = Column(UUIDType, ForeignKey("__reana.user_.id_"))
     type_ = Column(
         Enum(InteractiveSessionType),
@@ -369,6 +364,14 @@ class Workflow(Base, Timestamp):
     git_repo = Column(String(255))
     git_provider = Column(String(255))
 
+    sessions = relationship(
+        "InteractiveSession",
+        secondary="__reana.workflow_session",
+        lazy="dynamic",
+        backref="workflow",
+        cascade="all, delete",
+    )
+
     __table_args__ = (
         UniqueConstraint(
             "name", "owner_id", "run_number", name="_user_workflow_run_uc"