之前已经知道了：
【整理】Flask-Migrate经验 总结 心得 | 在路上
Flask-Migrate不支持自动检测出enum中的key和字符串value的变化
现在想办法去搞清楚：
对于如何把enmu的：
class TaskStatus(enum.Enum): Created = “Created” Started = “Started” # == task grabbed -> consider started ToBeDetermine = “ToBeDetermine” # after upload info, need initiator to be determined Delivering = “Delivering” # after upload info, no need initiator determine Completed = “Completed” Canceled = “Canceled” |
改为：
class TaskStatus(enum.Enum): Created = “Created” Started = “Started” # == task grabbed -> consider started ToBeConfirmed = “ToBeConfirmed” # after upload info, need initiator confirm Delivering = “Delivering” # after upload info, no need initiator determine Completed = “Completed” Canceled = “Canceled” |
即把TaskStatus中的ToBeDetermine改为ToBeConfirmed
-》之前的旧的办法是：
直接是通过（Mac的Sequel Pro中）直接修改（MySQL）数据库的定义而实现，修改enum的定义的：
现在要去搞清楚：
如何手动去改写生成的alembic脚本，去支持。
flask-migrate upgrade enum
flask-migrate enum
alembic enum
python – Flask-Migrate having issue with enum class in models – Stack Overflow
Handling changes to enum types · Issue #43 · miguelgrinberg/Flask-Migrate
建议：
最好不用enum，而改用引用表reference tables
python – Altering an Enum field using Alembic – Stack Overflow
Existing PostgreSQL ENUMs in Alembic (Example)
Re: Using alembic with the Declarative Enum recipe.
alembic change existing enum
zzzeek / alembic / issues / #270 – Altering enum type — Bitbucket
说也是可以的？
op.alter_column(“my_table”, “my_column”, existing_type=ENUM(…), type_=ENUM()) |
How do I change enum values after previously creating a table? – Google Groups
Since PostgreSQL types are not owned by tables, I don’t think there is a good way to make this automatic. You can try adding an “after-drop” DDL event that drops the User_Roles type when you drop the table, but that has its own problems. If you are looking to migrate table data to use the new enum, a script like this should work: ALTER TYPE User_Roles RENAME TO User_Roles_Old; CREATE TYPE User_Roles AS ENUM (‘user’, ‘superuser’); ALTER TABLE some_table ALTER COLUMN some_column TYPE User_Roles USING CASE some_column WHEN ‘user’::User_Roles_Old THEN ‘user’::User_Roles WHEN ‘admin’::User_Roles_Old THEN ‘superuser’::User_Roles END; DROP TYPE User_Roles_Old; |
Auto Generating Migrations — Alembic 0.8.9 documentation
|
-》此处不是postgresql，其内置支持ENUM，所以不支持这么写：
ENUM
flask.ext.sqlalchemy.SQLAlchemy.Enum – Nullege Python Samples
alembic alter enum
alembic db enum
alembic document
Welcome to Alembic’s documentation! — Alembic 0.8.9 documentation
Running “Batch” Migrations for SQLite and Other Databases — Alembic 0.8.9 documentation
参考自己之前的：
中的：
Downgrade don’t drop ENUM Column Types · Issue #48 · miguelgrinberg/Flask-Migrate
->
sa.Column(‘type’, sa.Enum(‘a’, ‘b’,’c’, name=’custom_type’), nullable=True),
和：
from alembic import op import sqlalchemy as sa NotificationTime = sa.Enum(u”不提醒”, u”事件发生时”, u”5分钟前”, u”15分钟前”, u”30分钟前”, u”1小时前”, u”2小时前”, u”1天前”, u”2天前”, u” 1周前”, name=’NotificationTime’) def upgrade(): ### commands auto generated by Alembic – please adjust! ### #op.add_column(‘events’, sa.Column(‘notification_time’, sa.Enum(<enum ‘NotificationTime’>), nullable=True)) op.add_column(‘events’, sa.Column(‘notification_time’, NotificationTime, nullable=True)) ### end Alembic commands ### |
那么先去生成脚本，然后再去手动改为：
“””change ToBeDetermine to ToBeConfirmed of TaskStatus Revision ID: ee1ce65b0254 Revises: 2fcd2aa96580 Create Date: 2016-11-04 17:53:21.701974 “”” # revision identifiers, used by Alembic. revision = ‘ee1ce65b0254’ down_revision = ‘2fcd2aa96580’ from alembic import op import sqlalchemy as sa def upgrade(): ### commands auto generated by Alembic – please adjust! ### 。。。 op.alter_column(“tasks”, “statusType”, default=”Created”, existing_type=sa.Enum(“Created”, “Started”, “ToBeDetermine”, “Delivering”, “Completed”, “Canceled”, name=”TaskStatus”), type=sa.Enum(“Created”, “Started”, “ToBeConfirmed”, “Delivering”, “Completed”, “Canceled”, name=”TaskStatus”)) ### end Alembic commands ### def downgrade(): ### commands auto generated by Alembic – please adjust! ### 。。。 op.alter_column(“tasks”, “statusType”, default=”Created”, existing_type=sa.Enum(“Created”, “Started”, “ToBeConfirmed”, “Delivering”, “Completed”, “Canceled”, name=”TaskStatus”), type=sa.Enum(“Created”, “Started”, “ToBeDetermine”, “Delivering”, “Completed”, “Canceled”, name=”TaskStatus”)) ### end Alembic commands ### |
然后去upgrade试试：
没有报错：
(RunningFast) ➜ staging python db_manager.py db upgrade <div–<—————————————————————————— DEBUG in app [/root/RunningFast/staging/runningfast/app.py:113]: app=<Flask ‘runningfast.app’>, server_port=21085, api=<flask_restful.Api object at 0x7f4df3c9d2d0>, redis_store=<flask_redis.FlaskRedis object at 0x7f4df5f1b890>, db=<SQLAlchemy engine=’mysql://runningfast:Jiandao123@localhost/runningfast_dev’>, server_mode=staging, server_type=develop, rq=<flask_rq2.app.RQ object at 0x7f4df3c9d710>, sockets=<flask_sockets.Sockets object at 0x7f4df3c9da90> <div–<—————————————————————————— <div–<—————————————————————————— DEBUG in app [/root/RunningFast/staging/runningfast/app.py:213]: API_VERSION=1.0, API_URL_PREFIX=/runningfast/api/v1.0, OPEN_API_URL_PREFIX=/runningfast/api/v1.0/open <div–<—————————————————————————— INFO [alembic.runtime.migration] Context impl MySQLImpl. INFO [alembic.runtime.migration] Will assume non-transactional DDL. INFO [alembic.runtime.migration] Running upgrade 2fcd2aa96580 -> ee1ce65b0254, change ToBeDetermine to ToBeConfirmed of TaskStatus |
然后再去数据库中看看，是否已经被改过来了：
结果还是没有改过来：
还是旧的：
ToBeDetermine
结果只能是手动去修改：
【总结】
此处，虽然可以修改Flask-Migrate生成的alembic的脚本，使用sa的Enum去alter_column
但是结果还是无效。
-》还是手动去数据库中修改Enum的值的吧。