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# 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)
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