Djando与Pandas访问ForeignKey

Question

I do not know Pandas so this may be trivial.

I have this line of code:

admin_data = pd.DataFrame.from_records(administrations.values()).rename(columns = {'id':'administration_id', 'study_id': 'study_name', 'url_hash': 'link'})

which is getting data from the administration model ( administrations is a recordset) and using it. Rather than using study_id I would like to get the study name. With Djano ORM I would use study__name but I cannot do that here.

How can I get the study.name instead of study.id into admin_data ?

models

class administration(models.Model):
    study = models.ForeignKey("study") # Study name
    ...

class study(models.Model):
    name = models.CharField(max_length = 51) # Study name
    ...

Answer 1

Query the columns you need and use the __ syntax to get the name through the foreign key:

admin_data = pd.DataFrame.from_records(
    administrations.values(
        "id",
        "study__name",  # <-- get the name through the foreign key
        "url_hash",
    )
).rename(
    columns={
        "id": "administration_id",
        "study__name": "study_name",
        "url_hash": "link",
    }
)