def get_echarts_instance(self, *args, **kwargs):
device_data = models.Device.objects.values('device_type').annotate(
count=Count('device_type'))
device_types, counters = fetch(device_data, 'device_type', 'count')
pie = Pie("设备分类", page_title='设备分类', width='100%')
pie.add("设备分类", device_types, counters, is_label_show=True)
battery_lifes = models.Device.objects.values('name', 'battery_life')
names, lifes = fetch(battery_lifes, 'name', 'battery_life')
bar = Bar('设备电量', page_title='设备电量', width='100%')
bar.add("设备电量", names, lifes)
page = Page.from_charts(pie, bar)
return page
def test_fetch(self):
names = fetch(DICT_LIST_DATA, 'name')
self.assertListEqual(names, ['Alice', 'Bob', 'Charlie'])
sexs = fetch(DICT_LIST_DATA, 'sex', default='male')
self.assertListEqual(sexs, ['female', 'male', 'male'])
names, ages = fetch(DICT_LIST_DATA, 'name', 'age')
self.assertListEqual(names, ['Alice', 'Bob', 'Charlie'])
self.assertListEqual(ages, [30, 56, 56])
names, ages, sexs = fetch(DICT_LIST_DATA, 'name', 'age', 'sex', defaults={'sex': 'male'})
self.assertListEqual(names, ['Alice', 'Bob', 'Charlie'])
self.assertListEqual(ages, [30, 56, 56])
self.assertListEqual(sexs, ['female', 'male', 'male'])
def test_with_dict(self):
"""
Use dict.get(key) to pick item.
"""
names, ages = fetch(DICT_LIST_DATA, 'name', 'age', getter=lambda item, key: item.get(key))
self.assertListEqual(names, ['Alice', 'Bob', 'Charlie'])
self.assertListEqual(ages, [30, 56, 56])
def test_custom_getter(self):
my_getter = lambda item, key: item.get(key)
data_list = [MockItem(1, 2, 3), MockItem(4, 5, 6), MockItem(7, 8, 9)]
xs, ys, zs = fetch(data_list, 'x', 'y', 'z', getter=my_getter)
self.assertListEqual([1, 4, 7], xs)