转换JavaScript 2D数组

Question

I am creating a dashboard to show data from various stats. I am using Django and Google Charts for creating graphs. It has been good so far but I am stuck at one particular case.

the model class is-

class Registration(models.Model):
    event_type = models.CharField(max_length=80)
    date_time = models.DateField()
    count = models.IntegerField()

my query is-

Registration.objects.filter(event_type__in=['VHRAssmntCompleted', 
    'VNAAssmntCompleted', 
    'NonsmokersDeclrtn',
    'MWBAssmntCompleted',
    'VHCAssmntCompleted',
    'SV Document Uploads',
    'PapSmear',
    'Mammogram',], 
    date_time__range=(d3,d1)).order_by('date_time')

I get the data in following format:

[["VHR", "2019-02-1", 23],
["VNA", "2019-02-1", 34],
["PAP", "2019-02-1", 50],
["VHR", "2019-02-2", 92],
["VNA", "2019-02-2", 13],
["PAP", "2019-02-2", 65],
["VHR", "2019-02-3", 192],
["VNA", "2019-02-3", 43],
["PAP", "2019-02-3", 11]]

To create a Combo Chart in need the data in following format(something like python dataframe):

[["date", "VHR", "VNA", "PAP" ],
["2019-02-1", 23,34,50],
["2019-02-2", 92,13,65],
["2019-02-3", 192,43,11]]

I am unable to find a way to do this, either format it using Django ORM query itself or transform using JS.

I need help with what approach should I go.

Answer 1

you can group them by date, then using Object.entries loop through the grouped result and transform it to [date, "VHR", "VNA", "PAP"]

 const data = [ ["VHR", "2019-02-1", 23], ["VNA", "2019-02-1", 34], ["PAP", "2019-02-1", 50], ["VHR", "2019-02-2", 92], ["VNA", "2019-02-2", 13], ["PAP", "2019-02-2", 65], ["VHR", "2019-02-3", 192], ["VNA", "2019-02-3", 43], ["PAP", "2019-02-3", 11] ]; const grouped = data.reduce((all, [key, date, value]) => { all[date] = { ...all[date], [key]: value }; return all; }, {}); const result = ["date", "VHR", "VNA", "PAP"].concat( Object.entries(grouped).map(([date, obj]) => [date, ...Object.values(obj)]) ); console.log(result); 

Answer 2

You could take an object for the column position of the values and collect the data by date and column.

 var data = [["VHR", "2019-02-1", 23], ["VNA", "2019-02-1", 34], ["PAP", "2019-02-1", 50], ["VHR", "2019-02-2", 92], ["VNA", "2019-02-2", 13], ["PAP", "2019-02-2", 65], ["VHR", "2019-02-3", 192], ["VNA", "2019-02-3", 43], ["PAP", "2019-02-3", 11]], cols = { VHR: 1, VNA: 2, PAP: 3 }, result = data.reduce((r, [key, date, value]) => { var row = r.find(([d]) => d === date); if (!row) { r.push(row = [date, 0, 0, 0]); } row[cols[key]] = value; return r; }, [["date", "VHR", "VNA", "PAP"]]); console.log(result); 

 .as-console-wrapper { max-height: 100% !important; top: 0; }