Pony ORM order_by json積分值

Question

Pony ORM似乎是按Json值的字符串排序的，而不是整數值。有沒有辦法讓這個訂單正確？

下面是一個例子：

from pony.orm import (
    Database, Required, Optional, db_session, commit, 
    show, Json) 

db = Database() 
db.bind('sqlite', filename=':memory:', create_db=True) 

class Person(db.Entity): 
    name = Required(str) 
    body = Optional(Json, default={}) 

db.generate_mapping(create_tables=True) 


with db_session: 
    Person(name='bort', body={'age': 1}) 
    Person(name='baz', body={'age': 2}) 
    Person(name='bar', body={'age': 10}) 
    Person(name='foo', body={'age': 20}) 

    commit() 

    people = Person.select().order_by(lambda p: p.body['age']) 
    show(people) 

輸出：

id|name|body  
--+----+----------- 
1 |bort|{'age': 1} 
3 |bar |{'age': 10} 
2 |baz |{'age': 2} 
4 |foo |{'age': 20} 

有沒有辦法來解決這個問題，並小馬ORM不支持這一點，還是我做錯了什麼？

Answer 1

此問題已在0.7.3中解決。

Answer 2

Comment: causes Pony to raise and exception:
"TypeError: Function 'int' cannot be used this way: int(p.body['age'])"

無法與pony驗證，嘗試，如果pony接受這一點：

def _int(v): 
    return int(v) 

people = Person.select().order_by(lambda p: _int(p.body['age'])) 

---

Question: Is there a way to work around this, does Pony ORM not support this

您使用sqlite，是有關文獻json是str。
變通方法：

lambda p: int(p.body['age']) 

給我NO錯誤與純Python。

Pony ORM: JSON Support in Databases
For storing JSON in the database Pony uses the following types:

SQLite - TEXT 
    PostgreSQL - JSONB (binary JSON) 
    MySQL - JSON (binary JSON, although it doesn’t have ‘B’ in the name) 
    Oracle - CLOB 

Starting with the version 3.9 SQLite provides the JSON1 extension module. This extension improves performance when working with JSON queries, although Pony can work with JSON in SQLite even without this module.