Comments (3)
andrewkcarter
commented on September 27, 2024
I ended up copying and modifying shiftr to maintain an input stack instead of only the current input through the recursive apply() calls, and changed the AtPath reference to leverage BasePathAndGroupReference so I could optionally specify a path index value which is used walk up the stack. With these changes I can now use "@2": "&1.[]" to accomplish what I needed. This enables a basic filter/sort capability where you can use drill down matching as criteria to determine which elements to shift.
[
{
"operation": "shift2",
"spec": {
"entities": {
"*": {
"type": {
"*": {
"@2": "&1.[]"
}
}
}
}
}
}
]
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milosimpson
commented on September 27, 2024
Interesting idea. Can please show me what the input and output look like for your new spec?
I think I get it now. The "@2" pulls the entire "{ type:alpha, data:foo }" block, then deposits in to "alpha.[]".
Neat.
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andrewkcarter
commented on September 27, 2024
One example is demonstrated in my original question, and is this:
Input
{
"entities":[
{
"type":"alpha",
"data":"foo"
},
{
"type":"beta",
"data":"bar"
},
{
"type":"alpha",
"data":"baz"
}
]
}
Spec
[
{
"operation": "shift2",
"spec": {
"entities": {
"*": {
"type": {
"*": {
"@2": "&1.[]"
}
}
}
}
}
}
]
Output
{
"alpha":[
{
"type":"alpha",
"data":"foo"
},
{
"type":"alpha",
"data":"baz"
}
],
"beta":[
{
"type":"beta",
"data":"bar"
}
]
}
Another (untested) example might be to filter out all but paperback books:
Input
{
"books": [
{
"title": "foo",
"availability": [
"online"
]
},
{
"title": "bar",
"availability": [
"online",
"paperback"
]
},
{
"title": "baz",
"availability": [
"paperback"
]
}
]
}
Spec
[
{
"operation": "shift2",
"spec": {
"books": {
"*": {
"availability": {
"*": {
"paperback": {
"@3": "PaperBooks[]"
}
}
}
}
}
}
}
]
Output
{
"PaperBooks":[
{
"title":"bar",
"availability":[
"online",
"paperback"
]
},
{
"title":"baz",
"availability":[
"paperback"
]
}
]
}
One behavior that could be better with this example though is if I used { "paperback|online": { "@4": "PaperBooks[] } we end up with four books because the object with both paperback and online is duplicated. This is just an undesirable side effect of how matching is performed in the existing shiftr implementation, but that could probably be addressed.
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