Springhare JSONP API part

api.py

def get_exportable_objects(objects, field_groups=None):
	return [get_exportable_object(object, field_groups) for object in objects]


def get_exportable_object(object, field_groups=None):
	"""Gathering information about public fields."""

	# Primary model
	data = parse_exportable_fields(object, field_groups)

	# Related models
	for relation in object._meta.get_all_related_objects():
		if hasattr(relation.model, 'exportable'):
			model_name = relation.model._meta.module_name
			if hasattr(object, model_name):
				data.update(parse_exportable_fields(getattr(object, model_name), field_groups, model_name))

	return data


def parse_exportable_fields(model, field_groups=None, prefix=None):
	data = {}
	for field_name in get_exportable_fields(model, field_groups):
		key = '%s_%s' % (prefix, field_name) if prefix else field_name
		data[key] = getattr(model, field_name)
	return data


def get_exportable_fields(model, groups=None):
	if not hasattr(model, 'exportable'): return []

	all_groups = model.exportable
	if not groups:
		return all_groups['default'] if 'default' in all_groups else []

	if isinstance(groups, str): groups = [groups]

	fields = []
	for group in groups:
		if group not in all_groups: continue
		for field in all_groups[group]:
			if field not in fields:
				fields.append(field)

	return fields

models.py

class Gallery(models.Model):
	…
	exportable = {
		'default': ('title', 'status', 'is_system',),
		'short': ('title', 'status', 'is_system',),
		'admin': ('title', 'status', 'is_system', 'language', 'level',),
	}