modelviz added

modelviz.py

@@ -0,0 +1,201 @@
+#!/usr/bin/env python
+"""Django model to DOT (Graphviz) converter
+by Antonio Cavedoni <antonio@cavedoni.org>
+
+Make sure your DJANGO_SETTINGS_MODULE is set to your project or
+place this script in the same directory of the project and call
+the script like this:
+
+$ python modelviz.py [-h] [-d] <app_label> ... <app_label> > <filename>.dot
+$ dot <filename>.dot -Tpng -o <filename>.png
+
+options:
+    -h, --help
+    show this help message and exit.
+
+    -d, --disable_fields
+    don't show the class member fields.
+"""
+__version__ = "0.8"
+__svnid__ = "$Id: modelviz.py 78 2007-07-15 19:04:47Z verbosus $"
+__license__ = "Python"
+__author__ = "Antonio Cavedoni <http://cavedoni.com/>"
+__contributors__ = [
+   "Stefano J. Attardi <http://attardi.org/>",
+   "limodou <http://www.donews.net/limodou/>",
+   "Carlo C8E Miron",
+   "Andre Campos <cahenan@gmail.com>",
+   "Justin Findlay <jfindlay@gmail.com>",
+   ]
+
+import getopt, sys
+
+from django.core.management import setup_environ
+
+try:
+    import settings
+except ImportError:
+    pass
+else:
+    setup_environ(settings)
+
+from django.template import Template, Context
+from django.db import models
+from django.db.models import get_models
+from django.db.models.fields.related import \
+    ForeignKey, OneToOneField, ManyToManyField
+
+try:
+    from django.db.models.fields.generic import GenericRelation
+except ImportError:
+    from django.contrib.contenttypes.generic import GenericRelation
+
+head_template = """
+digraph name {
+  fontname = "Helvetica"
+  fontsize = 8
+
+  node [
+    fontname = "Helvetica"
+    fontsize = 8
+    shape = "plaintext"
+  ]
+   edge [
+    fontname = "Helvetica"
+    fontsize = 8
+  ]
+
+"""
+
+body_template = """
+  {% for model in models %}
+    {% for relation in model.relations %}
+    {{ relation.target }} [label=<
+        <TABLE BGCOLOR="palegoldenrod" BORDER="0" CELLBORDER="0" CELLSPACING="0">
+        <TR><TD COLSPAN="2" CELLPADDING="4" ALIGN="CENTER" BGCOLOR="olivedrab4"
+        ><FONT FACE="Helvetica Bold" COLOR="white"
+        >{{ relation.target }}</FONT></TD></TR>
+        </TABLE>
+        >]
+    {{ model.name }} -> {{ relation.target }}
+    [label="{{ relation.name }}"] {{ relation.arrows }};
+    {% endfor %}
+  {% endfor %}
+
+  {% for model in models %}
+    {{ model.name }} [label=<
+    <TABLE BGCOLOR="palegoldenrod" BORDER="0" CELLBORDER="0" CELLSPACING="0">
+     <TR><TD COLSPAN="2" CELLPADDING="4" ALIGN="CENTER" BGCOLOR="olivedrab4"
+     ><FONT FACE="Helvetica Bold" COLOR="white"
+     >{{ model.name }}</FONT></TD></TR>
+
+    {% if not disable_fields %}
+        {% for field in model.fields %}
+        <TR><TD ALIGN="LEFT" BORDER="0"
+        ><FONT {% if field.blank %}COLOR="#7B7B7B" {% endif %}FACE="Helvetica Bold">{{ field.name }}</FONT
+        ></TD>
+        <TD ALIGN="LEFT"
+        ><FONT {% if field.blank %}COLOR="#7B7B7B" {% endif %}FACE="Helvetica Bold">{{ field.type }}</FONT
+        ></TD></TR>
+        {% endfor %}
+    {% endif %}
+    </TABLE>
+    >]
+  {% endfor %}
+"""
+
+tail_template = """
+}
+"""
+
+def generate_dot(app_labels, **kwargs):
+    disable_fields = kwargs.get('disable_fields', False)
+
+    dot = head_template
+
+    for app_label in app_labels:
+        app = models.get_app(app_label)
+        graph = Context({
+            'name': '"%s"' % app.__name__,
+            'disable_fields': disable_fields,
+            'models': []
+            })
+
+        for appmodel in get_models(app):
+            model = {
+                'name': appmodel.__name__,
+                'fields': [],
+                'relations': []
+                }
+
+            # model attributes
+            def add_attributes():
+                model['fields'].append({
+                    'name': field.name,
+                    'type': type(field).__name__,
+                    'blank': field.blank
+                    })
+
+            for field in appmodel._meta.fields:
+                add_attributes()
+
+            if appmodel._meta.many_to_many:
+                for field in appmodel._meta.many_to_many:
+                    add_attributes()
+
+            # relations
+            def add_relation(extras=""):
+                _rel = {
+                    'target': field.rel.to.__name__,
+                    'type': type(field).__name__,
+                    'name': field.name,
+                    'arrows': extras
+                    }
+                if _rel not in model['relations']:
+                    model['relations'].append(_rel)
+
+            for field in appmodel._meta.fields:
+                if isinstance(field, ForeignKey):
+                    add_relation()
+                elif isinstance(field, OneToOneField):
+                    add_relation("[arrowhead=none arrowtail=none]")
+
+            if appmodel._meta.many_to_many:
+                for field in appmodel._meta.many_to_many:
+                    if isinstance(field, ManyToManyField):
+                        add_relation("[arrowhead=normal arrowtail=normal]")
+                    elif isinstance(field, GenericRelation):
+                        add_relation(
+                            '[style="dotted"] [arrowhead=normal arrowtail=normal]')
+            graph['models'].append(model)
+
+        t = Template(body_template)
+        dot += '\n' + t.render(graph)
+
+    dot += '\n' + tail_template
+
+    return dot
+
+def main():
+    try:
+        opts, args = getopt.getopt(sys.argv[1:], "hd",
+                    ["help", "disable_fields"])
+    except getopt.GetoptError, error:
+        print __doc__
+        sys.exit(error)
+    else:
+        if not args:
+            print __doc__
+            sys.exit()
+
+    kwargs = {}
+    for opt, arg in opts:
+        if opt in ("-h", "--help"):
+            print __doc__
+            sys.exit()
+        if opt in ("-d", "--disable_fields"):
+            kwargs['disable_fields'] = True
+    print generate_dot(args, **kwargs)
+
+if __name__ == "__main__":
+    main()