Filter by root key value

[joshbuddy]

Filter by root key value

[Skarlso]

Huh. That is odd. I should think that that should work as well. I'll investigate.

[NDuggan]

@Skarlso can confirm that it now worked using $.[?(@.initial == true)] which is perfect.

Thanks again for your quick response and action! 🥇

[Skarlso]

You're welcome. Thanks for testing and reporting the issue.

[Skarlso]

Could you please try @.initial just simply? I'll investigate soon.

[Skarlso]

For the record, jsonpath the gem is rather using this as a guide: http://jsonpath.com/ for which the above does not work.

[Skarlso]

Hah! Try this: $.[?(@ == true)]. Since it's the first node, that should work.

@NDuggan

[NDuggan]

Thanks for the reply @Skarlso. I did in fact try using @ == true before posting but that didn't work.

Also without referencing the key you could end up filtering by the wrong element, e.g.:

{
  "initial": false,
  "another": true
}

[Skarlso]

I see the dilemma. I'll try and fix it. :)

[Skarlso]

@NDuggan bamm! :)

  def test_another
    json = {
      initial: true,
      not: true
    }.to_json
    p JsonPath.on(json, "$.initial[?(@)]")
    json = {
      initial: false,
      not: true
    }.to_json
    p JsonPath.on(json, "$.initial[?(@)]")
  end

Output:

# Running:

[true]
[]
.

[NDuggan]

@Skarlso awesome, thank you very much.

I can also confirm that your examples work and the following also works.

json = {initial: 'foo'}.to_json
JsonPath.on(json, "$.initial[?(@ == 'foo')]")
=> ["foo"]

Is there any reason though, that you cannot do this:

json = {initial: true}.to_json
JsonPath.on(json, "$.initial[?(@ == true)]")
=> []

[Skarlso]

Sorry, I'm swamped, going to look at it today maybe, but tomorrow latest.

[Skarlso]

Ah, because I strip out @... so the expression becomes "== true" which won't work. That's why you can't do this. I'm gonna fix it.

[Skarlso]

So this is quiet odd.

$.[?(@.initial == true)] should actually work fine. :/

el: true; operator: ==; operand: true
ret = el.send(operator.strip, operand)

Returns false. :O

While irb:

2.3.1 :001 > true.send("==", true)
 => true

I don't get it.

[Skarlso]

It's a string. :/ Argh. Of course. It's the same problem as with the false thing.

[Skarlso]

works now as it does with Jayway's parser:

{
    "initial": true,
    "second": true,
}

Path: $.[?(@.initial == true)]

Result:

[
   {
      "initial" : true,
      "second" : true
   }
]

@NDuggan Is that okay?

[Skarlso]

Also, fixed the parser so that it properly defines true and false now. :)

[NDuggan]

@Skarlso sorry I was away for a few days, I'm going to pull the latest version and give it a go! 👍