The dumpscript
command generates a standalone Python script that will repopulate the database using objects. The advantage of this approach is that it is easy to understand, and more flexible than directly populating the database, or using XML
Why?
There are a few benefits to this: 1. less drama with model evolution: foreign keys handled naturally without IDs, new and removed columns are ignored 1. edit script to create 1,000s of generated entries using for loops, generated names, python modules etc.
For example, an edited script can populate the database with test data.
for i in xrange(2000):
poll = Poll()
poll.question = "Question #%d" % i
poll.pub_date = date(2001,01,01) + timedelta(days=i)
poll.save()
Real databases will probably be bigger and more complicated, and so it is useful to enter some values using the admin interface and then edit the generated scripts.
Features
ForeignKey
andManyToManyFields
(using python variables, not object IDs)- Self-referencing
ForeignKey
(and M2M) fields - Sub-classed models
ContentType
fields and generic relationships (but see issue 43)- Recursive references
AutoField
s are excluded- Parent models are only included when no other child model links to it
- Individual models can be referenced
What it can't do (yet!)
- Ideal handling of generic relationships (ie no
AutoField
references): issue 43 - Intermediate join tables: issue 48
- GIS fields: issue 72
How?
To dump the data from all the models in a given Django app (appname
):
$ ./manage.py dumpscript appname > scripts/testdata.py
To dump the data from just a single model (appname.ModelName
):
$ ./manage.py dumpscript appname.ModelName > scripts/testdata.py
To reset a given app, and reload with the saved data:
$ ./manage.py reset appname
$ ./manage.py runscript testdata
Note: Runscript needs scripts
to be a module, so create the directory and a __init__.py
file.