3 files changed, 173 insertions, 0 deletions
diff --git a/demo/graphviz/management/__init__.py b/demo/graphviz/management/__init__.py
new file mode 100644
index 00000000..e69de29b
--- /dev/null
+++ b/demo/graphviz/management/__init__.py
diff --git a/demo/graphviz/management/commands/__init__.py b/demo/graphviz/management/commands/__init__.py
new file mode 100644
index 00000000..e69de29b
--- /dev/null
+++ b/demo/graphviz/management/commands/__init__.py
diff --git a/demo/graphviz/management/commands/modelviz.py b/demo/graphviz/management/commands/modelviz.py
new file mode 100644
index 00000000..30d8421d
--- /dev/null
+++ b/demo/graphviz/management/commands/modelviz.py
@@ -0,0 +1,173 @@
+
+# Copyright (c) 2011,  2012 Free Software Foundation
+
+#     This program is free software: you can redistribute it and/or modify
+#     it under the terms of the GNU Affero General Public License as
+#     published by the Free Software Foundation, either version 3 of the
+#     License, or (at your option) any later version.
+
+#     This program is distributed in the hope that it will be useful,
+#     but WITHOUT ANY WARRANTY; without even the implied warranty of
+#     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#     GNU Affero General Public License for more details.
+
+#     You should have received a copy of the GNU Affero General Public License
+#     along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+
+#!/usr/bin/env python
+import getopt, sys
+
+from optparse import make_option
+
+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
+
+from django.core.management.base import AppCommand
+
+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
+
+class Command(AppCommand):
+    option_list = AppCommand.option_list + (
+        make_option('--disable_fields', default=False, dest='disable_fields',
+            help='Hide fields.'),
+    )
+    help = "Prints a Graphviz .dot file from models ."
+    
+    def handle(self, *app_labels, **options):
+        disable_fields = options.get('disable_fields', False)
+        return generate_dot(app_labels, **options)
+
+