|
@@ -0,0 +1,79 @@
|
|
|
+"""Peewee migrations -- 002_add_local_sharing.py.
|
|
|
+
|
|
|
+Some examples (model - class or model name)::
|
|
|
+
|
|
|
+ > Model = migrator.orm['table_name'] # Return model in current state by name
|
|
|
+ > Model = migrator.ModelClass # Return model in current state by name
|
|
|
+
|
|
|
+ > migrator.sql(sql) # Run custom SQL
|
|
|
+ > migrator.run(func, *args, **kwargs) # Run python function with the given args
|
|
|
+ > migrator.create_model(Model) # Create a model (could be used as decorator)
|
|
|
+ > migrator.remove_model(model, cascade=True) # Remove a model
|
|
|
+ > migrator.add_fields(model, **fields) # Add fields to a model
|
|
|
+ > migrator.change_fields(model, **fields) # Change fields
|
|
|
+ > migrator.remove_fields(model, *field_names, cascade=True)
|
|
|
+ > migrator.rename_field(model, old_field_name, new_field_name)
|
|
|
+ > migrator.rename_table(model, new_table_name)
|
|
|
+ > migrator.add_index(model, *col_names, unique=False)
|
|
|
+ > migrator.add_not_null(model, *field_names)
|
|
|
+ > migrator.add_default(model, field_name, default)
|
|
|
+ > migrator.add_constraint(model, name, sql)
|
|
|
+ > migrator.drop_index(model, *col_names)
|
|
|
+ > migrator.drop_not_null(model, *field_names)
|
|
|
+ > migrator.drop_constraints(model, *constraints)
|
|
|
+
|
|
|
+"""
|
|
|
+
|
|
|
+from contextlib import suppress
|
|
|
+
|
|
|
+import peewee as pw
|
|
|
+from peewee_migrate import Migrator
|
|
|
+
|
|
|
+
|
|
|
+with suppress(ImportError):
|
|
|
+ import playhouse.postgres_ext as pw_pext
|
|
|
+
|
|
|
+
|
|
|
+def migrate(migrator: Migrator, database: pw.Database, *, fake=False):
|
|
|
+ """Write your migrations here."""
|
|
|
+
|
|
|
+ # Adding fields created_at and updated_at to the 'user' table
|
|
|
+ migrator.add_fields(
|
|
|
+ "user",
|
|
|
+ created_at=pw.BigIntegerField(null=True), # Allow null for transition
|
|
|
+ updated_at=pw.BigIntegerField(null=True), # Allow null for transition
|
|
|
+ last_active_at=pw.BigIntegerField(null=True), # Allow null for transition
|
|
|
+ )
|
|
|
+
|
|
|
+ # Populate the new fields from an existing 'timestamp' field
|
|
|
+ migrator.sql(
|
|
|
+ 'UPDATE "user" SET created_at = timestamp, updated_at = timestamp, last_active_at = timestamp WHERE timestamp IS NOT NULL'
|
|
|
+ )
|
|
|
+
|
|
|
+ # Now that the data has been copied, remove the original 'timestamp' field
|
|
|
+ migrator.remove_fields("user", "timestamp")
|
|
|
+
|
|
|
+ # Update the fields to be not null now that they are populated
|
|
|
+ migrator.change_fields(
|
|
|
+ "user",
|
|
|
+ created_at=pw.BigIntegerField(null=False),
|
|
|
+ updated_at=pw.BigIntegerField(null=False),
|
|
|
+ last_active_at=pw.BigIntegerField(null=False),
|
|
|
+ )
|
|
|
+
|
|
|
+
|
|
|
+def rollback(migrator: Migrator, database: pw.Database, *, fake=False):
|
|
|
+ """Write your rollback migrations here."""
|
|
|
+
|
|
|
+ # Recreate the timestamp field initially allowing null values for safe transition
|
|
|
+ migrator.add_fields("user", timestamp=pw.BigIntegerField(null=True))
|
|
|
+
|
|
|
+ # Copy the earliest created_at date back into the new timestamp field
|
|
|
+ # This assumes created_at was originally a copy of timestamp
|
|
|
+ migrator.sql('UPDATE "user" SET timestamp = created_at')
|
|
|
+
|
|
|
+ # Remove the created_at and updated_at fields
|
|
|
+ migrator.remove_fields("user", "created_at", "updated_at", "last_active_at")
|
|
|
+
|
|
|
+ # Finally, alter the timestamp field to not allow nulls if that was the original setting
|
|
|
+ migrator.change_fields("user", timestamp=pw.BigIntegerField(null=False))
|