dynamic choices based on another field input.

[rajeev yadla]

hi have a form which have two fields. one field has a foreignkey from model A(in image) base field. and another field is a drop down box where the choices should be dynamic based on first field selection. the choices should all the values of field Os from second model B associated with the Base key value i have given in first field. 
example from image. 
field 1= 10
field 2= (A,C) as these two values are associted with 10 in model B.

can someone help me here.

[Derek]

See:

http://django-autocomplete-light.readthedocs.io/en/master/tutorial.html#filtering-results-based-on-the-value-of-other-fields-in-the-form