nicedjango

Nice django tools

ModelGraph

Selective dumping and loading of only the needed model data for all objects and their related objects of one or more querysets.

This is done by

• getting a graph of all relations between models,
• getting all pks first in chunks,
• dump them in an order that enables correct loading.

Examples

# show model graph parts that would be dumped and those which not:
# example for query model a1.A with relation to child a1.B(A)
./manage.py dump_graph -p -q a -r a.b
    a1-a:
               a1-a.b          to child            a1-b.pk
       excludes:
               a1-a.f          to foreign          a1-f.a
     a1-b:
               a1-b.pk         to parent           a1-a.pk
       excludes:
               a1-b.c          to child            a1-c.pk
               a1-b.e          to child            a1-e.pk

# dump all objects from a1.models.A.objects.filter() with relation a.b as compact yaml:
./manage.py dump_graph -f dump.yaml -s compact_yaml -q a.filter(pk__in=(1,2)) -r a.b
    - a1-a: [pk]
     - [1]
     - [2]
     - a1-b: [pk]
     - [2]

# load back the dumped dump.yaml
./manage.py load_graph -f dump.yaml -s compact_yaml

# by default serializing into compact csv files is enabled:
mkdir dump_folder
./manage.py dump_graph -f dump_folder -q a.filter(pk__in=(1,2)) -r a.b
#results in two files under dump_folder:
# a1-a.csv:
 a1-a:pk
 1
 2
# and a1-b.csv:
 a1-b:pk
 2