Custom String PID

[mqtang89]

希望能支持字符串 PID，本人传题时想使用 CF 式的题目编号（42C 864F 这样的）。
另外，数字 ID 无法修改并且只能按顺序排下来，这是设计成这样的？如果能做成 SYZOJ 那样可以自由修改编号就好了
顺便吐槽一下，自己的域中不能删除题目（或许我应该开另一个 Issue）（这是 Feature?）

[twd2]

For custom PIDs, we have a plan to support custom text PIDs, but all of us do not have time to implement it. Feel free to open a PR :)
For deleting problems, this is a known issue, which is under discussion.

[undefined-moe]

You can change/delete what you want by directly accessing the database.
你可以直接访问数据库来更改/删除内容。

[twd2]

I just remember that you may try the following commands to add a problem with arbitrary PID if you can access the shell:

alias pm="python3 -m"
pm vj4.model.adaptor.problem add system "Dummy Problem" "# It *works*" -1 1000

where 1000 is the PID. The arguments are the same as https://github.com/vijos/vj4/blob/master/vj4/model/adaptor/problem.py#L37

[undefined-moe]

A 404 error will occur if you are trying to access string PID problem.
Although it can be created through the command line.

[twd2]

GGed

[undefined-moe]

I would try to support string PID.

[undefined-moe]

Supported now.
Repo: masnn/vj4
Docker Image : masnn/vj4
Test site: https://oj.masnn.ml/

[twd2]

Please notice that masnn's version is not the official version and it is no warranty.

[twd2]

We come up with a new proposal: allow users to set an alias/name/string PID (as we call it doc_name in the code) for each problem through the problem settings page.

[undefined-moe]

this feature is still developing.(#514)

…

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