alembic: track string field lengths

migrations/env.py

@@ -41,7 +41,7 @@ def run_migrations_offline():
 
     """
     url = config.get_main_option("sqlalchemy.url")
-    context.configure(url=url)
+    context.configure(url=url, compare_type=True)
 
     with context.begin_transaction():
         context.run_migrations()
@@ -73,7 +73,8 @@ def run_migrations_online():
     context.configure(connection=connection,
                       target_metadata=target_metadata,
                       process_revision_directives=process_revision_directives,
-                      **current_app.extensions['migrate'].configure_args)
+                      **current_app.extensions['migrate'].configure_args,
+                      compare_type=True)
     
     try:
         with context.begin_transaction():

migrations/versions/44c2e37ef899_update_trailing_field_lengths.py

@@ -0,0 +1,58 @@
+"""update trailing field lengths
+
+Revision ID: 44c2e37ef899
+Revises: cfb91e6aa9fc
+Create Date: 2021-04-25 22:51:58.510197
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = '44c2e37ef899'
+down_revision = 'cfb91e6aa9fc'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.alter_column('guest', 'name',
+               existing_type=sa.VARCHAR(length=64),
+               type_=sa.Unicode(length=32),
+               existing_nullable=True)
+    op.alter_column('topic', 'title',
+               existing_type=sa.VARCHAR(length=32),
+               type_=sa.Unicode(length=128),
+               existing_nullable=True)
+    op.alter_column('trophy', 'name',
+               existing_type=sa.TEXT(),
+               type_=sa.Unicode(length=64),
+               existing_nullable=True)
+    op.alter_column('user', 'type',
+               existing_type=sa.VARCHAR(length=20),
+               type_=sa.String(length=30),
+               existing_nullable=True)
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.alter_column('user', 'type',
+               existing_type=sa.String(length=30),
+               type_=sa.VARCHAR(length=20),
+               existing_nullable=True)
+    op.alter_column('trophy', 'name',
+               existing_type=sa.Unicode(length=64),
+               type_=sa.TEXT(),
+               existing_nullable=True)
+    op.alter_column('topic', 'title',
+               existing_type=sa.Unicode(length=128),
+               type_=sa.VARCHAR(length=32),
+               existing_nullable=True)
+    op.alter_column('guest', 'name',
+               existing_type=sa.Unicode(length=32),
+               type_=sa.VARCHAR(length=64),
+               existing_nullable=True)
+    # ### end Alembic commands ###