What is the best way to add fields dynamically to my SearchIndex?

Currently i see two possibilities, with using locals() and using setattr() after definition of SearchIndex class:

1.

class JobTestIndex(indexes.SearchIndex, indexes.Indexable):
    for name in fields:
	locals()["attr_%s" % name] = DescriptionSearchField(boost=3, **{"d_attr": name, "name": "attr"})
	locals()["slug_%s" % name] = DescriptionSearchField(**{"d_attr": name, "name": "slug"})

2.

class JobTestIndex(indexes.SearchIndex, indexes.Indexable):
    pass

for name in fields:
    setattr(JobTestIndex, "attr_%s" % name, DescriptionSearchField(boost=3, **{"d_attr": name, "name": "attr"}))
    lsetattr(JobTestIndex, "slug_%s" % name, DescriptionSearchField(**{"d_attr": name, "name": "slug"}))

What is then the correct solution for my issue?

Any suggestions are greatly appreciated. Thanks.

No project file or test is named. Start with the SearchIndex and DescriptionSearchField usage shown in the issue, then inspect how django-haystack registers fields declared in a class versus fields added afterward. Done would require a decided, documented approach with tests demonstrating dynamic fields.