planetstack/dmdot

   1 #!/usr/bin/python
   2
   3 import os
   4 import pdb
   5 import sys
   6 import json
   7
   8 sys.path.append('.')
   9
  10 os.environ.setdefault("DJANGO_SETTINGS_MODULE", "planetstack.settings")
  11
  12 from django.db.models.fields.related import ForeignKey
  13
  14 # defaults
  15 app = "core"
  16 output = "-json"
  17
  18 # syntax: dmdot [-json | -dot] [app_name]
  19
  20 # poor man's argument parser
  21 for arg in sys.argv[1:]:
  22     if arg.startswith("-"):
  23         output = arg
  24     else:
  25         app = arg
  26
  27 app = app + ".models"
  28 #models_module = imp.load_source(app, ".")
  29 models_module = __import__(app)
  30 for part in app.split(".")[1:]:
  31     models_module = getattr(models_module,part)
  32
  33 PlCoreBase = getattr(models_module,"PlCoreBase")
  34
  35 model_classes = []
  36 class_names = []
  37 lower_class_names = {}
  38 for classname in dir(models_module):
  39         c = getattr(models_module, classname, None)
  40         if type(c)==type(PlCoreBase):
  41                 model_classes.append(c)
  42                 class_names.append(c.__name__)
  43                 lower_class_names[c.__name__.lower()] = c
  44
  45 # django doesn't use the correct case in field.name.title() for objects that
  46 # have CamelCased class names. So, compare everything in lower case.
  47
  48 if (output=='-dot'):
  49         print "digraph plstack {";
  50         for c in model_classes:
  51                 fields = c._meta.fields
  52                 for f in fields:
  53                         if type(f)==ForeignKey and f.name.lower() in lower_class_names:
  54                                 linked_class = lower_class_names[f.name.lower()]
  55                                 print '\t"%s"->"%s";'%(c.__name__,linked_class.__name__)
  56         print "}\n";
  57 elif (output=='-json'):
  58         d = {}
  59         for c in model_classes:
  60                 fields = c._meta.fields
  61                 for f in fields:
  62                         if type(f)==ForeignKey and f.name.lower() in lower_class_names:
  63                                 linked_class = lower_class_names[f.name.lower()]
  64                                 try:
  65                                         d[c.__name__].append(linked_class.__name__)
  66                                 except KeyError:
  67                                         d[c.__name__]=[linked_class.__name__]
  68         print json.dumps(d,indent=4)
  69
  70