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astrobasis/management/commands/02_delete_gaia.py

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+from django.core.management.base import BaseCommand, CommandError
+
+from datetime import date
+from heasarc.models import INPUT_DATA_DIR
+import datetime
+from django.utils import timezone
+import astropy
+from astropy.io import ascii
+import pandas as pd
+import pymysql
+from sqlalchemy import create_engine
+import numpy.ma as ma
+
+from astrobasis.models import GaiaSourceFile, GAIADR2
+
+from astropy_healpix import HEALPix
+from astropy.coordinates import SkyCoord  # High-level coordinates
+from astropy.coordinates import ICRS, Galactic, FK4, FK5  # Low-level frames
+from astropy.coordinates import Angle, Latitude, Longitude  # Angles
+import astropy.units as u
+
+
+import os
+import glob
+import logging
+
+def delete_gaia():
+
+    gaia_loaded = GaiaSourceFile.objects.all() #filter(status__exact='loaded')
+    total_loaded = gaia_loaded.count()
+    total = 0
+    for gaia in gaia_loaded:
+        total_linked = gaia.gaiadr2_set.all().count()
+        print("%s %s linked: %d nrows: %d" % (gaia.filename, gaia.status,total_linked,gaia.nrows))
+
+        linked = gaia.gaiadr2_set.all()
+        linked.delete()
+        gaia.status='empty'
+        gaia.save()
+        total+=1
+
+    print("Total %d removed from %d" % (total, total_loaded,))
+    pass
+
+class Command(BaseCommand):
+    help = 'Initiates data dase'
+
+    def handle(self, *args, **options):
+        delete_gaia()
+        
+
+