add email branding mapping table

migrations/versions/0161_email_branding.py

@@ -0,0 +1,46 @@
+"""
+
+Revision ID: 0161_email_branding
+Revises: 0160_another_letter_org
+Create Date: 2018-01-30 15:35:12.016574
+
+"""
+from alembic import op
+import sqlalchemy as sa
+from sqlalchemy.dialects import postgresql
+
+revision = '0161_email_branding'
+down_revision = '0160_another_letter_org'
+
+
+def upgrade():
+    op.create_table('email_branding',
+        sa.Column('id', postgresql.UUID(as_uuid=True), nullable=False),
+        sa.Column('colour', sa.String(length=7), nullable=True),
+        sa.Column('logo', sa.String(length=255), nullable=True),
+        sa.Column('name', sa.String(length=255), nullable=True),
+        sa.PrimaryKeyConstraint('id')
+    )
+    op.create_table('service_email_branding',
+        sa.Column('service_id', postgresql.UUID(as_uuid=True), nullable=True),
+        sa.Column('email_branding_id', postgresql.UUID(as_uuid=True), nullable=True),
+        sa.ForeignKeyConstraint(['email_branding_id'], ['email_branding.id'], ),
+        sa.ForeignKeyConstraint(['service_id'], ['services.id'], ),
+        sa.UniqueConstraint('service_id', name='uix_service_email_branding_one_per_service'),
+        sa.PrimaryKeyConstraint('service_id')
+    )
+    op.execute("""
+        INSERT INTO email_branding (id, colour, logo, name)
+        SELECT id, colour, logo, name
+        FROM organisation
+    """)
+    op.execute("""
+        INSERT INTO service_email_branding (service_id, email_branding_id)
+        SELECT id, organisation_id
+        FROM services where organisation_id is not null
+    """)
+
+
+def downgrade():
+    op.drop_table('service_email_branding')
+    op.drop_table('email_branding')