Adds ondelete cascades to foreign keys in the participant and case ta…

…bles to allow project deletion (Netflix#3082) (#61)

Co-authored-by: Marc Vilanova <39573146+mvilanova@users.noreply.github.com>

src/dispatch/case/models.py

@@ -86,7 +86,7 @@ class Case(Base, TimeStampMixin, ProjectMixin):
     )
 
     # relationships
-    assignee_id = Column(Integer, ForeignKey(Participant.id))
+    assignee_id = Column(Integer, ForeignKey("participant.id", ondelete="CASCADE"))
     assignee = relationship(
         Participant, foreign_keys=[assignee_id], lazy="subquery", post_update=True
     )

src/dispatch/database/revisions/tenant/versions/2023-03-08_1d21b28bc553.py

@@ -0,0 +1,28 @@
+"""Adds ondelete cascade to case table for participant FK
+
+Revision ID: 1d21b28bc553
+Revises: 1ded4c2a7801
+Create Date: 2023-03-08 10:26:05.472740
+
+"""
+from alembic import op
+
+# revision identifiers, used by Alembic.
+revision = "1d21b28bc553"
+down_revision = "1ded4c2a7801"
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_constraint("case_assignee_id_fkey", "case", type_="foreignkey")
+    op.create_foreign_key(None, "case", "participant", ["assignee_id"], ["id"], ondelete="CASCADE")
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_constraint(None, "case", type_="foreignkey")
+    op.create_foreign_key("case_assignee_id_fkey", "case", "participant", ["assignee_id"], ["id"])
+    # ### end Alembic commands ###

src/dispatch/database/revisions/tenant/versions/2023-03-08_1ded4c2a7801.py

@@ -0,0 +1,41 @@
+"""Adds ondelete cascade to participant table for individual_contact FK
+
+Revision ID: 1ded4c2a7801
+Revises: 7ddae3ba7822
+Create Date: 2023-03-08 10:18:03.250210
+
+"""
+from alembic import op
+
+# revision identifiers, used by Alembic.
+revision = "1ded4c2a7801"
+down_revision = "7ddae3ba7822"
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_constraint("participant_individual_contact_id_fkey", "participant", type_="foreignkey")
+    op.create_foreign_key(
+        None,
+        "participant",
+        "individual_contact",
+        ["individual_contact_id"],
+        ["id"],
+        ondelete="CASCADE",
+    )
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_constraint(None, "participant", type_="foreignkey")
+    op.create_foreign_key(
+        "participant_individual_contact_id_fkey",
+        "participant",
+        "individual_contact",
+        ["individual_contact_id"],
+        ["id"],
+    )
+    # ### end Alembic commands ###

src/dispatch/participant/models.py

@@ -36,7 +36,7 @@ class Participant(Base):
     incident_id = Column(Integer, ForeignKey("incident.id", ondelete="CASCADE", use_alter=True))
     case_id = Column(Integer, ForeignKey("case.id", ondelete="CASCADE", use_alter=True))
     individual = relationship("IndividualContact", lazy="subquery", backref="participant")
-    individual_contact_id = Column(Integer, ForeignKey("individual_contact.id"))
+    individual_contact_id = Column(Integer, ForeignKey("individual_contact.id", ondelete="CASCADE"))
     participant_roles = relationship(
         "ParticipantRole", backref="participant", lazy="subquery", cascade="all, delete-orphan"
     )