How can firebase 3 query or angularfire2 filter pipe used to display snapshot data in tabular format with sum/total - firebase

Question

My firebase schema is as below:
{
"orders" : {
“-Shjy4X7atpPy12345Qum" : {
"qty" : 1,
"amount" : 10000,
"payment_type” : "Cash”,
"productId" : “-ShWSex7Hjit_mYrwuBA”,
"productPrice" : 13000,
"u_id" : “aABCW88eNIge4ysb9TDeTHESK4"
},
“-Ahjy6X9atpBy3435Hki” : {
"qty" : 1,
"amount" : 20000,
"payment_type” : "Card”,
"productId" : “-AhWFet9Hjit_mGrwuPA”,
"productPrice" : 13000,
"u_id" : “aABCW88eNIge4ysb9TDeTHESK4"
}
}
}
Desired output:
Orders
Product--------------------Quantity---------------Price
-ShWSex7Hjit_mYrwuBA------- 1 ---------------10000
-AhWFet9Hjit_mGrwuPA------- 1 ---------------10000
Grand Total : 20000
Can this be achieved in Firebase query:
{ query: {orderByChild: 'productId', equalTo: 'productId'}
or by using angular pipes ?
Solution is appreciated.

Answer 1

I can suggest one improvement in your DB schema to make it easier. Since a order can contain multiple products, maybe you can create a node under orders called "cart" which will have Key-Value pairs of productId (as key) and quantity (as value).
{
orders:
cart:
productId_1 : quantity_1,
productId_2 : quantity_2,
}
Now you can just read the "cart" node & each object of that node will have $key as productId - use that to retrieve price of the product. and $value is the quantity. Now you have all values you need.