Changes in 3.0

I tried to keep changes backwards-compatible as much as possible. In some places, APIs that have changed will trigger a .

get_conn() has changed to Database.connection()
execution_context() is replaced by simply using the database instance as a context-manager.
For a connection context without a transaction, use .
Database.create_tables() and , as well as Model.create_table() and all default to safe=True (create if not exists, drop if exists).
connect_kwargs attribute has been renamed to connect_params

db_table_func has changed to table_function
order_by has been removed (used for specifying a default ordering to be applied to SELECT queries).
validate_backrefs has been removed. Back-references are no longer validated.

db_column has changed to column_name
class attribute changed to field_type (used if you are implementing custom field subclasses)
model_class attribute has changed to model
PrimaryKeyField has been renamed to AutoField
constructor has the following changes: * rel_model has changed to model * to_field has changed to field * related_name has changed to backref
ManyToManyField is now included in the main peewee.py module
Removed the extension fields PasswordField, PickledField and AESEncryptedField.

The C extension that contained implementations of the query result wrappers has been removed.

The case() helper has moved from the playhouse.shortcuts module into the main peewee module.

The cast() method is no longer a function, but instead is a method on all column-like objects.

The SQLite extension module’s class accepts slightly different Meta options:

arguments - used to specify arbitrary arguments appended after any columns being defined on the virtual table. Should be a list of strings.
extension_module (unchanged)
options (replaces extension_options) - arbitrary options for the virtual table that appear after columns and arguments.
prefix_arguments - a list of strings that should appear before any arguments or columns in the virtual table declaration.

So, when declaring a model for a virtual table, it will be constructed roughly like this:

New stuff

The virtual-table implementation from sqlite-vtfunc has been folded into the peewee codebase.