code: def update_abbreviations(apps, schema_editor):
      
  
      # Get model managers
      Group = apps.get_model("representatives", "Group")
  
      # Abbreviation mapping
      amap = {
          u'SenComCult': u'Culture',
          u'SenComEco': u'Économie',
          u'SenComDef': u'Défense',
          u'SenComEU': u'Europe',
          u'SenComSoc': u'Social',
          u'SenComFin': u'Finances',
          u'SenComLois': u'Lois',
          u'SenComDevD': u'',
          u'SenComAppL': u'',
          u'AnComCult': u'Culture',
          u'AnComEco': u'Économie',
          u'AnComEtrg': u'Étranger',
          u'AnComDef': u'Défense',
          u'AnComEU': u'Europe',
          u'AnComSoc': u'Social',
          u'AnComFin': u'Finances',
          u'AnComLois': u'Lois',
          u'AnComDevD': u'',
          u'AnComImmu': u'',
      }
  
      for old, new in amap.iteritems():
          for g in Group.objects.filter(abbreviation=old):
              g.abbreviation = new
              g.save()
docs: Migrate to new FR committee abbreviations