How to retrieve data from two objects in json file? - angularjs

Question

If I have records for users and also records for orders, it is proper to save them like that:
{
"users": [
{"id": "1", "name": "Allan", "age": "40"},
{"id": "2", "name": "Jack", "age": "50"}
],
"orders": [
{ "id": "1", "item": "item 1", "userId": "1"},
{ "id": "2", "item": "item 3", "userId": "1"},
{ "id": "1", "item": "item 4", "userId": "1"},
{ "id": "1", "item": "item 51", "userId": "1"},
{ "id": "2", "item": "item 4", "userId": "1"}
]
}
as you can see I'm coming from the SQL world so I'm saving the 'orders' data with foreign key, is that the right way to save this data as json and if so how can I get all the users with there orders?
Thanks!

Answer 1

If your json object is in the above mentioned structure you can use this code to filter the orders
var oJson = {
"users": [
{"id": "1", "name": "Allan", "age": "40"},
{"id": "2", "name": "Jack", "age": "50"}
],
"orders": [
{ "id": "1", "item": "item 1", "userId": "1"},
{ "id": "2", "item": "item 3", "userId": "1"},
{ "id": "1", "item": "item 4", "userId": "1"},
{ "id": "1", "i`enter code here`tem": "item 51", "userId": "1"},
{ "id": "2", "item": "item 4", "userId": "1"}
]}
for(var i=0; i<oJson.users.length;i++){
for(var j=0; j<oJson.orders.length;j++){
if (oJson.users[i].id == oJson.orders[j].userId) {
console.log( oJson.orders[j].item, oJson.orders[j].userId)
//your logic here
}
}
}
But it is better to use sql joints to merge the orders and return the objects like this
{
"users": [
{"id": "1", "name": "Allan", "age": "40","orders": [{ "id": "1", "item": "item 1", "userId": "1"},{ "id": "2","item": "item 3", "userId": "1"},{ "id": "1", "item": "item 4", "userId": "1"},{ "id": "1", "item": "item 51", "userId": "1"},{ "id": "2", "item": "item 4", "userId": "1"}
]},
{"id": "2", "name": "Jack", "age": "50","orders":[]}
]}

Answer 2

Fetch the objects for json file into two varible
var a=value.users;
var b=value.orders;
value is nothing but the whole json file
then you can match them against each other like
a[0].id==b.[0].id