Create coupon model

app/models.py

@@ -1824,6 +1824,22 @@ class LifetimeCoupon(db.Model, ModelMixin):
     paid = db.Column(db.Boolean, default=False, server_default="0", nullable=False)
 
 
+class Coupon(db.Model, ModelMixin):
+    code = db.Column(db.String(128), nullable=False, unique=True)
+
+    # by default a coupon is for 1 year
+    nb_year = db.Column(db.Integer, nullable=False, server_default="1", default=1)
+
+    # whether the coupon has been used
+    used = db.Column(db.Boolean, default=False, server_default="0", nullable=False)
+
+    # the user who uses the code
+    # non-null when the coupon is used
+    used_by_user_id = db.Column(
+        db.ForeignKey(User.id, ondelete="cascade"), nullable=True
+    )
+
+
 class Directory(db.Model, ModelMixin):
     user_id = db.Column(db.ForeignKey(User.id, ondelete="cascade"), nullable=False)
     name = db.Column(db.String(128), unique=True, nullable=False)

migrations/versions/2021_071219_c31a081eab74_.py

@@ -0,0 +1,40 @@
+"""empty message
+
+Revision ID: c31a081eab74
+Revises: f3f19998b755
+Create Date: 2021-07-12 19:25:44.745045
+
+"""
+import sqlalchemy_utils
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = 'c31a081eab74'
+down_revision = 'f3f19998b755'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.create_table('coupon',
+    sa.Column('id', sa.Integer(), autoincrement=True, nullable=False),
+    sa.Column('created_at', sqlalchemy_utils.types.arrow.ArrowType(), nullable=False),
+    sa.Column('updated_at', sqlalchemy_utils.types.arrow.ArrowType(), nullable=True),
+    sa.Column('code', sa.String(length=128), nullable=False),
+    sa.Column('nb_year', sa.Integer(), server_default='1', nullable=False),
+    sa.Column('used', sa.Boolean(), server_default='0', nullable=False),
+    sa.Column('used_by_user_id', sa.Integer(), nullable=True),
+    sa.ForeignKeyConstraint(['used_by_user_id'], ['users.id'], ondelete='cascade'),
+    sa.PrimaryKeyConstraint('id'),
+    sa.UniqueConstraint('code')
+    )
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_table('coupon')
+    # ### end Alembic commands ###