將m2m更改爲char時，Django South遷移失敗

我有一個包含25個先前成功遷移的現有Django項目。將m2m更改爲char時，Django South遷移失敗
我將模型中的某些字段更改爲不同的類型，例如將m2m字段更改爲文本字段，現在我正在嘗試遷移它。
我跑：
python manage.py schemamigration backend --auto
然後
python manage.py migrate
，我得到以下
後端：0026_auto__del_vehicle__del_assetproperty__del_liabilityproperty__del_banka 致命錯誤 - 以下SQL查詢失敗：ALTER TABLE backend_userprofile MODIFY previous_address longtext NULL ;; 錯誤是：（1170，「沒有密鑰長度的密鑰規範中使用的BLOB/TEXT列'previous_address'）！在實際遷移過程中發現錯誤！中止。
! Since you have a database that does not support running 
! schema-altering statements in transactions, we have had 
! to leave it in an interim state between migrations. 

! You *might* be able to recover with: = CREATE INDEX `backend_userprofile_a44d8d16` ON `backend_userprofile` (`employer_address_id`); [] 
    = CREATE INDEX `backend_userprofile_eb751626` ON `backend_userprofile` (`previous_address_id`); [] 
    = CREATE INDEX `backend_userprofile_174f2184` ON `backend_userprofile` (`employer_phone_id`); [] 
    = CREATE TABLE `backend_vehicle` (`make` varchar(30) NOT NULL, `financial_status` integer NOT NULL, `values` numeric(30, 2) NOT NULL, `year` date NOT NULL, `model` varchar(30) NOT NULL, `id` integer AUTO_INCREMENT NOT NULL PRIMARY KEY); [] 
    = CREATE TABLE `backend_assetproperty` (`registered_name` varchar(30) NOT NULL, `id` integer AUTO_INCREMENT NOT NULL PRIMARY KEY, `estimate_value` numeric(30, 2) NOT NULL, `purchase_price` numeric(30, 2) NOT NULL); [] 
    = CREATE TABLE `backend_liabilityproperty` (`taxes_included` bool NOT NULL, `insured` bool NOT NULL, `monthly_payment` numeric(30, 2) NOT NULL, `payment_type` integer NOT NULL, `landlord` varchar(30) NOT NULL, `property_taxes` numeric(30, 2) NOT NULL, `id` integer AUTO_INCREMENT NOT NULL PRIMARY KEY, `amount_owing` numeric(30, 2) NOT NULL); [] 
    = CREATE TABLE `backend_bankaccountasset` (`balance` numeric(30, 2) NOT NULL, `id` integer AUTO_INCREMENT NOT NULL PRIMARY KEY, `bank_name` varchar(30) NOT NULL); [] 
    = CREATE TABLE `backend_credit` (`paid_in_full` bool NOT NULL, `monthly_payment` numeric(30, 2) NOT NULL, `person_business` integer NOT NULL, `balance` numeric(30, 2) NOT NULL, `institution_name` varchar(30) NOT NULL, `id` integer AUTO_INCREMENT NOT NULL PRIMARY KEY, `credit_limit` numeric(30, 2) NOT NULL); [] 
    = DROP TABLE `backend_liability` CASCADE; [] 
    = DROP TABLE `backend_asset` CASCADE; [] 
    = DROP TABLE `backend_otherincome` CASCADE; [] 
    = ALTER TABLE `backend_userprofile` ADD COLUMN `bank_branch_number` integer NULL; [] 
    - no dry run output for alter_column() due to dynamic DDL, sorry 
    = ALTER TABLE `backend_userprofile` ADD COLUMN `address_id` integer NULL; [] 
    - no dry run output for alter_column() due to dynamic DDL, sorry 
    = ALTER TABLE `backend_userprofile` ADD COLUMN `gross_monthly_income` numeric(30, 2) NULL; [] 
    - no dry run output for alter_column() due to dynamic DDL, sorry 
    = ALTER TABLE `backend_userprofile` ADD COLUMN `other_income` numeric(30, 2) NULL; [] 
    - no dry run output for alter_column() due to dynamic DDL, sorry 
    = ALTER TABLE `backend_userprofile` ADD COLUMN `bank_phone_id` integer NULL; [] 
    - no dry run output for alter_column() due to dynamic DDL, sorry 
    = ALTER TABLE `backend_userprofile` ADD COLUMN `bank_contact_details_id` integer NULL; [] 
    - no dry run output for alter_column() due to dynamic DDL, sorry 
    - no dry run output for delete_foreign_key() due to dynamic DDL, sorry 
    = ALTER TABLE `backend_userprofile` DROP COLUMN `current_address` CASCADE; [] 
    - no dry run output for delete_foreign_key() due to dynamic DDL, sorry 
    = ALTER TABLE `backend_userprofile` DROP COLUMN `current_unit_number` CASCADE; [] 
    - no dry run output for delete_foreign_key() due to dynamic DDL, sorry 
    = ALTER TABLE `backend_userprofile` DROP COLUMN `current_city` CASCADE; [] 
    - no dry run output for delete_foreign_key() due to dynamic DDL, sorry 
    = ALTER TABLE `backend_userprofile` DROP COLUMN `current_province` CASCADE; [] 
    - no dry run output for delete_foreign_key() due to dynamic DDL, sorry 
    = ALTER TABLE `backend_userprofile` DROP COLUMN `current_postal_code` CASCADE; [] 
    - no dry run output for delete_foreign_key() due to dynamic DDL, sorry 
    = ALTER TABLE `backend_userprofile` DROP COLUMN `current_time_at_residence` CASCADE; [] 
    - no dry run output for delete_foreign_key() due to dynamic DDL, sorry 
    = ALTER TABLE `backend_userprofile` DROP COLUMN `previous_unit_number` CASCADE; [] 
    - no dry run output for delete_foreign_key() due to dynamic DDL, sorry 
    = ALTER TABLE `backend_userprofile` DROP COLUMN `previous_city` CASCADE; [] 
    - no dry run output for delete_foreign_key() due to dynamic DDL, sorry 
    = ALTER TABLE `backend_userprofile` DROP COLUMN `previous_province` CASCADE; [] 
    - no dry run output for delete_foreign_key() due to dynamic DDL, sorry 
    = ALTER TABLE `backend_userprofile` DROP COLUMN `previous_postal_code` CASCADE; [] 
    - no dry run output for delete_foreign_key() due to dynamic DDL, sorry 
    = ALTER TABLE `backend_userprofile` DROP COLUMN `employment_position` CASCADE; [] 
    - no dry run output for delete_foreign_key() due to dynamic DDL, sorry 
    = ALTER TABLE `backend_userprofile` DROP COLUMN `employmer_manager_name` CASCADE; [] 
    - no dry run output for delete_foreign_key() due to dynamic DDL, sorry 
    = ALTER TABLE `backend_userprofile` DROP COLUMN `employment_duration_years` CASCADE; [] 
    - no dry run output for delete_foreign_key() due to dynamic DDL, sorry 
    = ALTER TABLE `backend_userprofile` DROP COLUMN `employment_duration_months` CASCADE; [] 
    - no dry run output for delete_foreign_key() due to dynamic DDL, sorry 
    = ALTER TABLE `backend_userprofile` DROP COLUMN `employer_unit_number` CASCADE; [] 
    - no dry run output for delete_foreign_key() due to dynamic DDL, sorry 
    = ALTER TABLE `backend_userprofile` DROP COLUMN `employer_city` CASCADE; [] 
    - no dry run output for delete_foreign_key() due to dynamic DDL, sorry 
    = ALTER TABLE `backend_userprofile` DROP COLUMN `employer_province` CASCADE; [] 
    - no dry run output for delete_foreign_key() due to dynamic DDL, sorry 
    = ALTER TABLE `backend_userprofile` DROP COLUMN `employer_postal_code` CASCADE; [] 
    - no dry run output for delete_foreign_key() due to dynamic DDL, sorry 
    = ALTER TABLE `backend_userprofile` DROP COLUMN `previous_employment_type` CASCADE; [] 
    - no dry run output for delete_foreign_key() due to dynamic DDL, sorry 
    = ALTER TABLE `backend_userprofile` DROP COLUMN `previous_employer_phone` CASCADE; [] 
    - no dry run output for delete_foreign_key() due to dynamic DDL, sorry 
    = ALTER TABLE `backend_userprofile` DROP COLUMN `previous_employer_address` CASCADE; [] 
    - no dry run output for delete_foreign_key() due to dynamic DDL, sorry 
    = ALTER TABLE `backend_userprofile` DROP COLUMN `previous_employer_unit_number` CASCADE; [] 
    - no dry run output for delete_foreign_key() due to dynamic DDL, sorry 
    = ALTER TABLE `backend_userprofile` DROP COLUMN `previous_employer_city` CASCADE; [] 
    - no dry run output for delete_foreign_key() due to dynamic DDL, sorry 
    = ALTER TABLE `backend_userprofile` DROP COLUMN `previous_employer_province` CASCADE; [] 
    - no dry run output for delete_foreign_key() due to dynamic DDL, sorry 
    = ALTER TABLE `backend_userprofile` DROP COLUMN `previous_employer_postal_code` CASCADE; [] 
    - no dry run output for delete_foreign_key() due to dynamic DDL, sorry 
    = ALTER TABLE `backend_userprofile` DROP COLUMN `employment_monthly_income` CASCADE; [] 
    - no dry run output for delete_foreign_key() due to dynamic DDL, sorry 
    = ALTER TABLE `backend_userprofile` DROP COLUMN `bank_contact_phone` CASCADE; [] 
    - no dry run output for delete_foreign_key() due to dynamic DDL, sorry 
    = ALTER TABLE `backend_userprofile` DROP COLUMN `bank_contact_fax` CASCADE; [] 
    - no dry run output for delete_foreign_key() due to dynamic DDL, sorry 
    = ALTER TABLE `backend_userprofile` DROP COLUMN `bank_institution_number` CASCADE; [] 
    - no dry run output for delete_foreign_key() due to dynamic DDL, sorry 
    = ALTER TABLE `backend_userprofile` DROP COLUMN `bank_transit_number` CASCADE; [] 
    - no dry run output for delete_foreign_key() due to dynamic DDL, sorry 
    = ALTER TABLE `backend_userprofile` DROP COLUMN `bank_address` CASCADE; [] 
    - no dry run output for delete_foreign_key() due to dynamic DDL, sorry 
    = ALTER TABLE `backend_userprofile` DROP COLUMN `bank_unit_number` CASCADE; [] 
    - no dry run output for delete_foreign_key() due to dynamic DDL, sorry 
    = ALTER TABLE `backend_userprofile` DROP COLUMN `bank_city` CASCADE; [] 
    - no dry run output for delete_foreign_key() due to dynamic DDL, sorry 
    = ALTER TABLE `backend_userprofile` DROP COLUMN `bank_province` CASCADE; [] 
    - no dry run output for delete_foreign_key() due to dynamic DDL, sorry 
    = ALTER TABLE `backend_userprofile` DROP COLUMN `bank_postal_code` CASCADE; [] 
    - no dry run output for delete_foreign_key() due to dynamic DDL, sorry 
    = ALTER TABLE `backend_userprofile` DROP COLUMN `residence_type` CASCADE; [] 
    - no dry run output for delete_foreign_key() due to dynamic DDL, sorry 
    = ALTER TABLE `backend_userprofile` DROP COLUMN `residence_value` CASCADE; [] 
    - no dry run output for delete_foreign_key() due to dynamic DDL, sorry 
    = ALTER TABLE `backend_userprofile` DROP COLUMN `residence_monthly_payment` CASCADE; [] 
    - no dry run output for delete_foreign_key() due to dynamic DDL, sorry 
    = ALTER TABLE `backend_userprofile` DROP COLUMN `claimed_bankruptcy` CASCADE; [] 
    - no dry run output for delete_foreign_key() due to dynamic DDL, sorry 
    = ALTER TABLE `backend_userprofile` DROP COLUMN `fraud_alerts` CASCADE; [] 
    - no dry run output for delete_foreign_key() due to dynamic DDL, sorry 
    = ALTER TABLE `backend_userprofile` DROP COLUMN `credit_consent` CASCADE; [] 
    - no dry run output for delete_foreign_key() due to dynamic DDL, sorry 
    = ALTER TABLE `backend_userprofile` DROP COLUMN `notes` CASCADE; [] 
    - no dry run output for delete_foreign_key() due to dynamic DDL, sorry 
    = ALTER TABLE `backend_userprofile` DROP COLUMN `signature` CASCADE; [] 
    - no dry run output for delete_foreign_key() due to dynamic DDL, sorry 
    = ALTER TABLE `backend_userprofile` DROP COLUMN `cobuyer_relationship` CASCADE; [] 
    - no dry run output for delete_foreign_key() due to dynamic DDL, sorry 
    = ALTER TABLE `backend_userprofile` DROP COLUMN `cobuyer_other` CASCADE; [] 
    = CREATE TABLE `backend_userprofile_vehicles` (`id` integer AUTO_INCREMENT NOT NULL PRIMARY KEY, `userprofile_id` integer NOT NULL, `vehicle_id` integer NOT NULL); [] 
    = ALTER TABLE `backend_userprofile_vehicles` ADD CONSTRAINT `backend_userprofile_vehicl_userprofile_id_2118f7c8e02a7a01_uniq` UNIQUE (`userprofile_id`, `vehicle_id`) [] 
    = CREATE TABLE `backend_userprofile_bank_accounts_asset` (`id` integer AUTO_INCREMENT NOT NULL PRIMARY KEY, `userprofile_id` integer NOT NULL, `bankaccountasset_id` integer NOT NULL); [] 
    = ALTER TABLE `backend_userprofile_bank_accounts_asset` ADD CONSTRAINT `backend_userprofile_bank_a_userprofile_id_3780e7dea36fdd1b_uniq` UNIQUE (`userprofile_id`, `bankaccountasset_id`) [] 
    = CREATE TABLE `backend_userprofile_credit` (`id` integer AUTO_INCREMENT NOT NULL PRIMARY KEY, `userprofile_id` integer NOT NULL, `credit_id` integer NOT NULL); [] 
    = ALTER TABLE `backend_userprofile_credit` ADD CONSTRAINT `backend_userprofile_credit_userprofile_id_aa5c94a808f9fb7_uniq` UNIQUE (`userprofile_id`, `credit_id`) [] 
    = CREATE TABLE `backend_userprofile_property_asset` (`id` integer AUTO_INCREMENT NOT NULL PRIMARY KEY, `userprofile_id` integer NOT NULL, `assetproperty_id` integer NOT NULL); [] 
    = ALTER TABLE `backend_userprofile_property_asset` ADD CONSTRAINT `backend_userprofile_proper_userprofile_id_3397e38f7c83f4db_uniq` UNIQUE (`userprofile_id`, `assetproperty_id`) [] 
    = CREATE TABLE `backend_userprofile_liability_properties` (`id` integer AUTO_INCREMENT NOT NULL PRIMARY KEY, `userprofile_id` integer NOT NULL, `liabilityproperty_id` integer NOT NULL); [] 
    = ALTER TABLE `backend_userprofile_liability_properties` ADD CONSTRAINT `backend_userprofile_liabil_userprofile_id_21457cbf6edd1007_uniq` UNIQUE (`userprofile_id`, `liabilityproperty_id`) [] 
    = DROP TABLE `backend_userprofile_other_income` CASCADE; [] 
    = DROP TABLE `backend_userprofile_assets` CASCADE; [] 
    = DROP TABLE `backend_userprofile_liabilities` CASCADE; [] 
    = 
      SELECT kc.`constraint_name`, kc.`column_name`, kc.`table_name`, 
       kc.`referenced_table_name`, kc.`referenced_column_name` 
      FROM information_schema.key_column_usage AS kc 
      WHERE 
       kc.table_schema = %s 
     ['pomelo_walker'] 
    - no dry run output for delete_foreign_key() due to dynamic DDL, sorry 
    - no dry run output for alter_column() due to dynamic DDL, sorry 
    = 
      SELECT kc.`constraint_name`, kc.`column_name`, kc.`table_name`, 
       kc.`referenced_table_name`, kc.`referenced_column_name` 
      FROM information_schema.key_column_usage AS kc 
      WHERE 
       kc.table_schema = %s 
     ['pomelo_walker'] 
    - no dry run output for delete_foreign_key() due to dynamic DDL, sorry 
    - no dry run output for alter_column() due to dynamic DDL, sorry 
    = 
      SELECT kc.`constraint_name`, kc.`column_name`, kc.`table_name`, 
       kc.`referenced_table_name`, kc.`referenced_column_name` 
      FROM information_schema.key_column_usage AS kc 
      WHERE 
       kc.table_schema = %s 
     ['pomelo_walker'] 
    - no dry run output for delete_foreign_key() due to dynamic DDL, sorry 
    - no dry run output for alter_column() due to dynamic DDL, sorry 

! The South developers regret this has happened, and would 
! like to gently persuade you to consider a slightly 
! easier-to-deal-with DBMS (one that supports DDL transactions) 
! NOTE: The error which caused the migration to fail is further up. 
Error in migration: backend:0026_auto__del_vehicle__del_assetproperty__del_liabilityproperty__del_banka 
Traceback (most recent call last): 
    File "manage.py", line 10, in <module> 
    execute_from_command_line(sys.argv) 
    File "/Users/chungwu/.virtualenvs/walkerfinancial/lib/python2.7/site-packages/django/core/management/__init__.py", line 443, in execute_from_command_line 
    utility.execute() 
    File "/Users/chungwu/.virtualenvs/walkerfinancial/lib/python2.7/site-packages/django/core/management/__init__.py", line 382, in execute 
    self.fetch_command(subcommand).run_from_argv(self.argv) 
    File "/Users/chungwu/.virtualenvs/walkerfinancial/lib/python2.7/site-packages/django/core/management/base.py", line 196, in run_from_argv 
    self.execute(*args, **options.__dict__) 
    File "/Users/chungwu/.virtualenvs/walkerfinancial/lib/python2.7/site-packages/django/core/management/base.py", line 232, in execute 
    output = self.handle(*args, **options) 
    File "/Users/chungwu/.virtualenvs/walkerfinancial/lib/python2.7/site-packages/south/management/commands/migrate.py", line 108, in handle 
    ignore_ghosts = ignore_ghosts, 
    File "/Users/chungwu/.virtualenvs/walkerfinancial/lib/python2.7/site-packages/south/migration/__init__.py", line 213, in migrate_app 
    success = migrator.migrate_many(target, workplan, database) 
    File "/Users/chungwu/.virtualenvs/walkerfinancial/lib/python2.7/site-packages/south/migration/migrators.py", line 235, in migrate_many 
    result = migrator.__class__.migrate_many(migrator, target, migrations, database) 
    File "/Users/chungwu/.virtualenvs/walkerfinancial/lib/python2.7/site-packages/south/migration/migrators.py", line 310, in migrate_many 
    result = self.migrate(migration, database) 
    File "/Users/chungwu/.virtualenvs/walkerfinancial/lib/python2.7/site-packages/south/migration/migrators.py", line 133, in migrate 
    result = self.run(migration) 
    File "/Users/chungwu/.virtualenvs/walkerfinancial/lib/python2.7/site-packages/south/migration/migrators.py", line 107, in run 
    return self.run_migration(migration) 
    File "/Users/chungwu/.virtualenvs/walkerfinancial/lib/python2.7/site-packages/south/migration/migrators.py", line 81, in run_migration 
    migration_function() 
    File "/Users/chungwu/.virtualenvs/walkerfinancial/lib/python2.7/site-packages/south/migration/migrators.py", line 57, in <lambda> 
    return (lambda: direction(orm)) 
    File "/Users/chungwu/Sites/pomelo/walkerfinancial/backend/migrations/0026_auto__del_vehicle__del_assetproperty__del_liabilityproperty__del_banka.py", line 347, in forwards 
    db.alter_column('backend_userprofile', 'previous_address', self.gf('django.db.models.fields.TextField')(null=True)) 
    File "/Users/chungwu/.virtualenvs/walkerfinancial/lib/python2.7/site-packages/south/db/generic.py", line 44, in _cache_clear 
    return func(self, table, *args, **opts) 
    File "/Users/chungwu/.virtualenvs/walkerfinancial/lib/python2.7/site-packages/south/db/generic.py", line 527, in alter_column 
    self.execute("ALTER TABLE %s %s;" % (self.quote_name(table_name), sql), values) 
    File "/Users/chungwu/.virtualenvs/walkerfinancial/lib/python2.7/site-packages/south/db/generic.py", line 273, in execute 
    cursor.execute(sql, params) 
    File "/Users/chungwu/.virtualenvs/walkerfinancial/lib/python2.7/site-packages/django/db/backends/util.py", line 40, in execute 
    return self.cursor.execute(sql, params) 
    File "/Users/chungwu/.virtualenvs/walkerfinancial/lib/python2.7/site-packages/django/db/backends/mysql/base.py", line 114, in execute 
    return self.cursor.execute(query, args) 
    File "/Users/chungwu/.virtualenvs/walkerfinancial/lib/python2.7/site-packages/MySQLdb/cursors.py", line 201, in execute 
    self.errorhandler(self, exc, value) 
    File "/Users/chungwu/.virtualenvs/walkerfinancial/lib/python2.7/site-packages/MySQLdb/connections.py", line 36, in defaulterrorhandler 
    raise errorclass, errorvalue 
django.db.utils.DatabaseError: (1170, "BLOB/TEXT column 'previous_address' used in key specification without a key length")
任何想法我怎麼能解決這個問題？
我運行Django的1.4.5和0.7.6南
來源
2013-02-27 Chung Wu
你正在使用哪些DBMS？ – Ponytech 2013-02-27 18:17:33
首先刪除你的應用程序從遷移文件夾最後遷移。
然後我會建議刪除m2m字段，創建一個遷移，然後添加新的文本字段並創建另一個遷移。我認爲南方應該能夠處理這個過程，如果你分兩步做。
來源
2013-02-27 16:08:47
將m2m更改爲char時，Django South遷移失敗

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