Django, filter by specified month and year in date range
I have the following models
class Destination_Deal(models.Model):
name = models.CharField(_("Nombre"),max_length=200)
class Departure_Date(models.Model):
date_from= models.DateField(_('Desde'))
date_to= models.DateField(_('Hasta'))
destination_deal = models.ForeignKey(Destination_Deal,verbose_name = _("Oferta de Destino"))
This is the actual data in the table departure_date
id date_from date_to destination_deal_id
1 2012-11-01 2013-03-17 1
2 2012-11-01 2012-12-16 2
3 2012-09-16 2012-10-31 3
4 2012-11-01 2012-12-16 3
5 2013-01-04 2013-01-11 4
I would like to filter the Destination_Deals if a specified month&year is between date_from and date_to.
Example 1
Month: September (09)
Year: 2012
Wanted departure dates result:
ID 3 : It is the only data range that touch 09/2012
Example 2
Month: February (02)
Year: 2013
Wanted departure dates result:
ID 1 : 02/2012 is before 03/2012
So, the day actually is does not matter. If the month&year is between date_from and date_to, even if it is by one day it must be filter.
I think I must use something like this but I am not sure how to do it.
Thanks in advance! Miguel
---Edit---
This is the test for the answer from Aamir Adnan but it is not working as I expected as ID 1 must be also returned because it goes from November 2012 to March 2013, so January 2013 is between.
Departure_Date.objects.all()
[<Departure_Date: id: 1 - from: 2012-11-01 - to: 2013-03-17>,
<Departure_Date: id: 2 - from: 2012-11-01 - to: 2012-12-16>,
<Departure_Date: id: 3 - from: 2012-09-16 - to: 2012-10-31>,
<Departure_Date: id: 4 - from: 2012-11-01 - to: 2012-12-16>,
<Departure_Date: id: 5 - from: 2013-01-04 - to: 2013-01-11>]
month:1
year:2013
where = '%(year)s >= YEAR(date_from) AND %(month)s >= MONTH(date_from) \
AND %(year)s <= YEAR(date_to) AND %(month)s <= MONTH(date_to)' % \
{'year': year, 'month': month}
Departure_Date.objects.extra(where=[where])
[<Departure_Date: id: 5 - from: 2013-01-04 - to: 2013-01-11>]
Solution 1:
Check the documentation
year = 2012
month = 09
Departure_Date.objects.filter(date_from__year__gte=year,
date_from__month__gte=month,
date_to__year__lte=year,
date_to__month__lte=month)
Alternative method using .extra
:
where = '%(year)s >= YEAR(date_from) AND %(month)s >= MONTH(date_from) \
AND %(year)s <= YEAR(date_to) AND %(month)s <= MONTH(date_to)' % \
{'year': year, 'month': month}
Departure_Date.objects.extra(where=[where])
There is a specific case where above query does not yield a desired result.
For example:
date_from='2012-11-01'
date_to='2013-03-17'
and input is
year=2013
month=1
Then %(month)s >= MONTH(date_from)
condition is wrong because month 1 is < month 11 in date_from
but year is different so MySQL IF
condition is required here:
where = '%(year)s >= YEAR(date_from) AND IF(%(year)s > YEAR(date_from), \
IF(%(month)s > MONTH(date_from), %(month)s >= MONTH(date_from), %(month)s < MONTH(date_from)), \
IF(%(month)s < MONTH(date_from), %(month)s < MONTH(date_from), %(month)s >= MONTH(date_from))) \
AND %(year)s <= YEAR(date_to) \
AND %(month)s <= MONTH(date_to)' % \
{'year': year, 'month': month}
Departure_Date.objects.extra(where=[where])
Solution 2:
Solution using python code only. Main idea is to construct date_from and date_to with python. Then these dates can be used in filter
with __lte
and __gte
:
import calendar
from datetime import datetime
from django.db.models import Q
def in_month_year(month, year):
d_fmt = "{0:>02}.{1:>02}.{2}"
date_from = datetime.strptime(
d_fmt.format(1, month, year), '%d.%m.%Y').date()
last_day_of_month = calendar.monthrange(year, month)[1]
date_to = datetime.strptime(
d_fmt.format(last_day_of_month, month, year), '%d.%m.%Y').date()
return Departure_Date.objects.filter(
Q(date_from__gte=date_from, date_from__lte=date_to)
|
Q(date_from__lt=date_from, date_to__gte=date_from))
Now this will work:
>>> Departure_Date.objects.all()
[<Departure_Date: id: 1 - from: 2012-11-01 - to: 2013-03-17>,
<Departure_Date: id: 2 - from: 2012-11-01 - to: 2012-12-16>,
<Departure_Date: id: 3 - from: 2012-09-16 - to: 2012-10-31>,
<Departure_Date: id: 4 - from: 2012-11-01 - to: 2012-12-16>,
<Departure_Date: id: 5 - from: 2013-01-04 - to: 2013-01-11>]
>>> in_month_year(month=1, year=2013)
[<Departure_Date: id: 1 - from: 2012-11-01 - to: 2013-03-17>,
<Departure_Date: id: 5 - from: 2013-01-04 - to: 2013-01-11>]