parent_child_index
Provide subarrays with consistent indexing
Definition
array[object] parent_child_index(array[object] $array, expression->[number|string|boolean|datetime] $childArraySelector)
For an array $array
of objects that share an array property with the same name $childArraySelector
, introduces indexing of the $childArraySelector
arrays that continues through the entire array
.
Parameters
array[object] $array
Array of objects that have a key with the same name that has an array value.
expression->array[any] $childArraySelector
An expression that returns an array, most commonly the array identifier.
Returns
The input array, where the objects that are elements of the $childArraySelector
arrays have an extra property _calculatedIndex
added. The value of _calculatedIndex
is equal to the ordinal number of the object when considered across all $childArraySelector
arrays from the top down.
Example
{
"employees":[
{
"department": "sales",
"members":[{"name": "Anna"}]
},
{
"department": "legal",
"members":[{"name": "Bob"}, {"name": "Clara"}]
},
{
"department":"engineering",
"members":[{"name": "David"}}]
}
{
employeesIndexed: parent_child_index(employees, members)
}
{
"employeesIndexed":[
{
"department": "sales",
"members":[{"name": "Anna","_calculatedIndex": 1}]
},
{
"department": "legal",
"members":[
{"name": "Bob","_calculatedIndex": 2},
{"name": "Clara","_calculatedIndex": 3}]
},
{
"department": "engineering",
"members":[{"name": "David","_calculatedIndex": 4}]
}]
}
Updated 12 months ago