Re: get_FOO_display() for generic/variable choice fields

My Python-expert partner suggested a clever workaround as follows:

As I'm already running through the model._meta.fields beforehand to
create header row for my .csv file, I can build a dictionary of the
choices to refer to later.

choices_lookup_dict = {}
header_row = []

for field in model._meta.fields:
# create header row for csv file
header_row.append(field.name)
# Add lookup dictionary of choices to dictionary of fields
# i.e. creating a dictionary of dictionaries for each choice field
if field.choices:
choices_lookup_dict[field.name] = dict(field.choices)

This could be quite expensive for large choice tuples such as country
lists, but at least we're only calling it once.

So now in my main loop I can use the following code to lookup my
verbose choice value:

for field in model._meta.fields:
val = getattr(obj, field.name)
if field.choices:
val = choices_lookup_dict[field.name][val]
row.append(val)

We assume that get_FOO_display() must be doing something like this
anyway!

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