Login

Tag "database"

47 snippets

Snippet List

Custom model field for mysql time type.

Django does not have a suitable model field can process time type in mysql, the DateTimeField built-in django can not process more than 24 hours. That's why the code born. **Simply usage** `from myapp.models import TimeAsTimeDeltaField, SECONDS_PER_MIN, SECONDS_PER_HOUR, SECONDS_PER_DAY class EstimatedTime: days = None hours = None minutes = None seconds = None class Case(models.Model): estimated_time = TimeAsTimeDeltaField(null=True, blank=True) def get_estimated_time(self): estimated_time = EstimatedTime() if self.estimated_time: total_seconds = self.estimated_time.seconds + (self.estimated_time.days * SECONDS_PER_DAY) days = total_seconds / SECONDS_PER_DAY hours = total_seconds / SECONDS_PER_HOUR - days * 24 minutes = total_seconds / SECONDS_PER_MIN - hours * 60 - days * 24 * 60 seconds = total_seconds % SECONDS_PER_MIN estimated_time.days = days estimated_time.hours = hours estimated_time.minutes = minutes estimated_time.seconds = seconds return estimated_time else: return estimated_time

  • models
  • orm
  • database
  • field
  • timedelta
Read More

PostgreSQL ON DELETE CASCADE

Have you always been annoyed by how you set up this elaborate big database schema and weren't able to have **ON DELETE CASCADE ON UPDATE CASCADE** in dbshell? This solves the problem; create the two files and and empty *__init__.py* and put them somewhere in your path. Then say DATABASE_ENGINE='postgresql_psycopg2_cascade' in settings. Really I'd like this to be in the ForeignKey object, were it upstream Django or an own version of it, but it doesn't seem possible. Ideas on how to make this configurable are more than welcome! Props go out to Ari Flinkman for the inspiration to do this!

  • database
  • postgres
  • foreign-key
  • postgresql
  • databases
Read More
Author: mjt
  • 1
  • 1