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