88 lines
2.7 KiB
ReStructuredText
88 lines
2.7 KiB
ReStructuredText
Graph models
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============
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:synopsis: Renders a graphical overview of your project or specified apps.
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Creates a GraphViz_ dot file for the specified app names based on their models.py.
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You can pass multiple app names and they will all be combined into a single model.
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Output is usually directed to a dot file.
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There several options available like: grouping models, including inheritance,
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excluding models and columns and changing the layout when rendering to an output
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image.
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With the latest revisions it's also possible to specify an output file if
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pygraphviz_ is installed and render directly to an image or other supported
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file-type.
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Selecting a library
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-------------------
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You need to select the library to generate the image, you can do so by passing
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the --pygraphviz or --pydot parameters depending on the library you want to use.
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When neither of the command line parameters are given the default is to try and load
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pygraphviz or pydot (in that order) to generate the image.
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To install pygraphviz you usually need to run this command:
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::
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$ pip install pygraphviz
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It is possible you can't install it because it needs some C extensions to build, you
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can try other methods to install or you can use PyDot.
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To install pydot you need to run this command:
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::
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$ pip install pyparsing==1.5.7
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$ pip install pydot
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Installation should be fast and easy, remember to install this exact version of
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pyparsing, otherwise it's possible you get this error:
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Couldn't import dot_parser, loading of dot files will not be possible.
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Default Settings
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----------------
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The option GRAPH_MODELS = {} can be used in the settings file to specify default options::
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GRAPH_MODELS = {
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'all_applications': True,
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'group_models': True,
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}
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It uses the same names as on the command line only with the leading two dashes removed and
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the other dashes replaced by underscores.
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Example Usage
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-------------
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With *django-extensions* installed you can create a dot-file or an
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image by using the *graph_models* command. Like used in the following examples::
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# Create a dot file
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$ ./manage.py graph_models -a > my_project.dot
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::
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# Create a PNG image file called my_project_visualized.png with application grouping
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$ ./manage.py graph_models -a -g -o my_project_visualized.png
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# Same example but with explicitly selecting pygraphviz or pydot
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$ ./manage.py graph_models --pygraphviz -a -g -o my_project_visualized.png
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$ ./manage.py graph_models --pydot -a -g -o my_project_visualized.png
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::
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# Create a dot file for only the 'foo' and 'bar' applications of your project
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$ ./manage.py graph_models foo bar > my_project.dot
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.. _GraphViz: http://www.graphviz.org/
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.. _pygraphviz: https://networkx.lanl.gov/wiki/pygraphviz
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.. _pydot: https://pypi.python.org/pypi/pydot
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