object attribute is missing after manager.py is restarted when using django redis cache

[sinall]

object attribute is missing after manager.py is restarted when using django redis cache

[WisdomPill]

hello @sinall, this is not the intended use of the library but most importantly you're using a class attribute and not an instance attribute, so actually cross_section_sequence is shared among all instances and initialised at declaration time (of CrossSectionFactory).

An example of what happens with class attributes is the following:

>>>class A:
...    b = {}
    
>>>A.b
{}
>>>a = A()
>>>a.b
{}
>>>A.b["a"] = "a"
>>> a.b
{'a': 'a'}
>>>class A:
...    b = {}
    
>>>a.b
{'a': 'a'}
>>>A.b
{}

so redeclaring class A overwrites class attributes. I would suggest you to cache only cross_section_sequence if you are interested in sharing that between processes/servers. I strongly discourage using pickle as it has security issues and is not that performant in big scale apps