add attachment model and task order relation to it

alembic/versions/14cd800904bc_add_task_order_association_to_.py

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+"""add task order association to attachments
+
+Revision ID: 14cd800904bc
+Revises: d7db8fd35b41
+Create Date: 2018-08-24 11:28:30.894412
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = '14cd800904bc'
+down_revision = 'd7db8fd35b41'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.add_column('task_order', sa.Column('attachment_id', sa.Integer(), nullable=True))
+    op.create_foreign_key(None, 'task_order', 'attachments', ['attachment_id'], ['id'])
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_constraint(None, 'task_order', type_='foreignkey')
+    op.drop_column('task_order', 'attachment_id')
+    # ### end Alembic commands ###

alembic/versions/d7db8fd35b41_add_attachment_table.py

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+"""add attachment table
+
+Revision ID: d7db8fd35b41
+Revises: 0845b2f0f401
+Create Date: 2018-08-24 11:27:15.317181
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = 'd7db8fd35b41'
+down_revision = '0845b2f0f401'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.create_table('attachments',
+    sa.Column('id', sa.Integer(), nullable=False),
+    sa.Column('filename', sa.String(), nullable=True),
+    sa.Column('object_name', sa.String(), nullable=True),
+    sa.PrimaryKeyConstraint('id'),
+    sa.UniqueConstraint('object_name')
+    )
+    op.create_unique_constraint(None, 'task_order', ['number'])
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_constraint(None, 'task_order', type_='unique')
+    op.drop_table('attachments')
+    # ### end Alembic commands ###