Dambudziko guru rine django query fields nderekuti havagone kubata zvisina maturo. Kana ukaedza kuisa kukosha kusina maturo mundima yemibvunzo, django inokanda imwe nzira. Izvi zvinogona kuva dambudziko kana uri kuedza kushandisa ndima mukuverenga kana mukutaura.
I have a model with a field that can be null. I want to query all the objects where this field is null. How do I do this? A: <code>MyModel.objects.filter(field__isnull=True) </code>
Iyi mutsara wekodhi iri kubvunza iyo MyModel zvinhu nekuzvisefa nemamiriro ekuti the field is null.
Null kukosha muDjango
A null value imhando yakakosha yekukosha muDjango inomiririra kusavapo kwemutengo. Semuenzaniso, tambo "null" haina kukosha.
Paunopa null kukosha kune inoshanduka, Django inoisa iyo shanduko kuti ive isina chinhu tambo sezvirimo. Iwe unogona kushandisa chimiro ichi kugadzira akasiyana-siyana asingamiriri chinhu.
Iwe unogona zvakare kushandisa null kukosha kuratidza kupera kwedata mune runyorwa kana duramazwi. Semuenzaniso, kana iwe uchida kugadzira runyoro rwetambo dzine chete tambo "null" uye "chokwadi", unogona kushandisa inotevera kodhi:
list = [“hapana”,”chokwadi”]
Chii chinonzi query field
Munda wekubvunza inzvimbo yakakosha muDjango admin interface iyo inokutendera kuti umhanye SQL mibvunzo uchipesana nedatabase rako.
