CODEWITHSUNDEEP
pythondjangodjango-modelsdjango-querysetdjango-orm
Debadatta Bhattacharjee
Debadatta Bhattacharjee

Reputation: 21

Django ORM returns non-iterable object

The model is

class WeeklyStrMst(BaseModel):
    StoreId = models.AutoField(primary_key=True)
    TDLinx_No = models.IntegerField(blank=True, null=True, default=None)
    Week = models.IntegerField(blank=True, null=True, default=None)
    Week_Number = models.IntegerField(blank=True, null=True, default=None)
    Year = models.IntegerField(blank=True, null=True, default=None)
    Category = models.CharField(max_length=75, blank=True, null=True, default=None)
    SeasonalPackaging = models.CharField(max_length=75, blank=True, null=True, default=None)
    Consumption = models.CharField(max_length=75, blank=True, null=True, default=None)
    Manufacturer = models.CharField(max_length=75, blank=True, null=True, default=None)
    PackType = models.CharField(max_length=75, blank=True, null=True, default=None)
    Volume = models.FloatField(blank=True, null=True, default=None)
    POS = models.FloatField(blank=True, null=True, default=None)
    StoreName = models.CharField(max_length=75, blank=True, null=True, default=None)
    MasterChain = models.CharField(max_length=75, blank=True, null=True, default=None)
    TerritoryName = models.CharField(max_length=75, blank=True, null=True, default=None)
    RegionName = models.CharField(max_length=75, blank=True, null=True, default=None)
    StoreClassification = models.CharField(max_length=75, blank=True, null=True, default=None)
    StateName = models.CharField(max_length=75, blank=True, null=True, default=None)
    class Meta:
        managed = True
        db_table = config_data[settings.REGION_NAME]['tables']['weekly_mstr']

WeeklyStrMst.objects.filter(StoreId__in=stores).values()

Here stores is of list datatype containing 6000-30000 values which are non-null, integer, so when I execute this, it returns me -

<django.db.models.query.QuerySet object at 0x0000024FD4EAAAF0>

I have tested with less than 2000 values it works fine. What could be possible reason and workaround for this scenario? How to pass a large list of array as a filter criteria?

Upvotes: 2

Views: 89

Answers (2)

Debadatta Bhattacharjee
Debadatta Bhattacharjee

Reputation: 21

Thank you all, I had to update the library mssql-django, the earlier version had limit on the number of parameters that can be passed, which they have updated.

Upvotes: 0

mentix02
mentix02

Reputation: 71

The QuerySet class is iterable - you can use it inside any for loop (even in templates).

The values function returns a QuerySet of dictionaries instead of your model instances and is, rest assured, also an iterable.

Edit -

If you're using SQLite for your database, there is usually a limit set on how many values you can pass for IN queries - https://sqlite.org/limits.html. You can change this value depending on the system you're using. Besides, if you're dealing with extremely heavy datasets, you'd be better off with a more scalable database like Postgres or MySQL.

Upvotes: 1

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