management command

Management command to fix subject headings with yaml tags in the
heading name

core/management/commands/fix_headings.py

@@ -0,0 +1,41 @@
+from django.core.management.base import BaseCommand
+
+from regluit.core.models import Subject
+
+
+
+class Command(BaseCommand):
+    '''funny syntax in yaml has resulted in spurious headings'''
+    help = "fix subjects with authority tags in the name"
+    
+    def handle(self, **options):
+        clean_headings('lcc')
+        clean_headings('lcsh')
+        clean_headings('bisac')
+
+def clean_headings(authority):
+   subjects = Subject.objects.filter(name__startswith="!{}:".format(authority))
+   pos=len(authority)+2
+   for subject in subjects:
+        the_subject = subject.name[pos:].strip()
+        new_subject = None
+        for prev_subject in Subject.objects.filter(name=the_subject, authority=authority):
+            new_subject = prev_subject
+        if not new_subject:
+            for prev_subject in Subject.objects.filter(name=the_subject):
+                new_subject = prev_subject
+                if not new_subject.authority:
+                    new_subject.authority=authority
+                    new_subject.save()
+        if new_subject:
+            for work in subject.works.all():
+                new_subject.works.add(work)
+            subject.delete()
+            continue
+        subject.name=the_subject 
+        subject.authority=authority
+        subject.save()
+                
+                
+                
+