python - Ordered lists of generic foreign keys in Django -

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i have app hierarchical course, note , task models. is, each course has bunch of note instances pointing foreignkey, , each note has bunch of task instances pointing it.

i want content in specific order, added sequence attribute course , note via parent model. allows them hold ordered list of pk's of linked instances (e.g. [1, 4, 6, 2, 3]), can edit order of.

i added global_sequence course, holds list of ('class_name', pk) tuples strings e.g. ["('note', 1)", "('task', 19)", "('task', 31)", "('note', 2)", "('task', 22)",].

class sequence(models.model):     sequence = django.contrib.postgres.fields.arrayfield(models.integerfield())   class course(sequence):     title = models.charfield(max_len=80)     global_sequence = django.contrib.postgres.fields.arrayfield(         models.charfield(max_len=30)         )   class note(sequence):     body = models.textfield()     course = models.foreignkey(course, related_name='content')   class task(models.model):     q = models.charfield(max_len=100)     = models.charfield(max_len=100)     note = models.foreignkey(note, related_name='content')

i feel approaches building sequence , global_sequence may naive since sequences have manually updated whenever linked instance created or deleted (i using signals this). also, strings in global_sequence error-prone , have use eval() them back, arraylist can't store tuples. have considered using contenttype model, don't know how use in ordered list.

my question is: is there less error-prone or safer (i.e. non-eval()) way keep linked instances - of identical or mixed models - in specific order?

the closest thing found this, says ordered list of integers not terrible if not updated, sequences updated frequently.


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