How to use feeder Array in check jsonPath

Gatling (Open-Source)
1

So, I have created a feeder.

val trackFeeder = Array(
Map(“trackid” → s"V1"),
Map(“trackid” → s"V2"),
Map(“trackid” → s"A1-A2"),
Map(“trackid” → s"A3-A4"),
Map(“trackid” → s"A5-A6"),
Map(“trackid” → s"A7-A8"),
Map(“trackid” → s"A9-A10"),
Map(“trackid” → s"A11-A12"),
Map(“trackid” → s"A13-A14"),
Map(“trackid” → s"A15-A16"),
Map(“trackid” → s"A17-A18"),
Map(“trackid” → s"A19-A20"),
Map(“trackid” → s"A21-A22"),
Map(“trackid” → s"A23-A24"),
Map(“trackid” → s"A25-A26"),
Map(“trackid” → s"A27-A28"),
Map(“trackid” → s"A29-A30"),
Map(“trackid” → s"A31-A32"),
).circular

And I wanted to check jsonPath by using the feeder.
jsonPath(session=>"$.tracks.${trackid}.representations…bandwidth").findAll.optional.saveAs(“bitrates”)
jsonPath(session=>"$.tracks.${trackid}.segments[-1:].out").find.optional.saveAs(“lastout”)
jsonPath(session=>"$.tracks.${trackid}.segments[-1:].step").find.optional.saveAs(“laststep”)

As I wanted to replace the ${trackid} with V1 in the feeder and so on. I’ve look the documentation. But still lack of info.
Could someone help me with this. Much thanks…

2

The documentation explicitly states you cannot use Expression Language inside functions: https://gatling.io/docs/gatling/reference/current/session/expression_el/

Moreover, you don’t even need it here.
jsonPath("$.tracks.${trackid}.representations…bandwidth").findAll.optional.saveAs(“bitrates”)

3

Thank you very much for the reply, apparently you are right about the bitrates part. But how to I retrieve the lastout and laststep from each track with different trackid.
The manifest looks like this. And I wish to get the lastout and laststep of each segment of each trackid.

{
“duration”: 10048,
“growing”: false,
“frameRate”: [
25,
1
],
“sampleRate”: [
48000,
1
],
“resolution”: [
640,
360
],
“pixelAspect”: [
1,
1
],
“tracks”: {
“A1-A2”: {
“channels”: 2,
“timescale”: [
1024,
48000
],
“segments”: [
{
“in”: 0,
“out”: 18750,
“step”: 375,
“stepStructure”: [
{
“in”: 0,
“out”: 46,
“step”: 46
},
{
“in”: 46,
“out”: 375,
“step”: 47
}
]
},
{
“in”: 18750,
“out”: 18842,
“step”: 46
}
],
“representations”: {
“128000”: {
“codec”: “mp4a.40.2”,
“bandwidth”: 128000,
“keyOffset”: 0
}
}
},
“A3-A4”: {
“channels”: 2,
“timescale”: [
1024,
48000
],
“segments”: [
{
“in”: 0,
“out”: 18750,
“step”: 375,
“stepStructure”: [
{
“in”: 0,
“out”: 46,
“step”: 46
},
{
“in”: 46,
“out”: 375,
“step”: 47
}
]
},
{
“in”: 18750,
“out”: 18842,
“step”: 46
}
],
“representations”: {
“128000”: {
“codec”: “mp4a.40.2”,
“bandwidth”: 128000,
“keyOffset”: 0
}
}
},
“A5-A6”: {
“channels”: 2,
“timescale”: [
1024,
48000
],
“segments”: [
{
“in”: 0,
“out”: 18750,
“step”: 375,
“stepStructure”: [
{
“in”: 0,
“out”: 46,
“step”: 46
},
{
“in”: 46,
“out”: 375,
“step”: 47
}
]
},
{
“in”: 18750,
“out”: 18842,
“step”: 46
}
],
“representations”: {
“128000”: {
“codec”: “mp4a.40.2”,
“bandwidth”: 128000,
“keyOffset”: 0
}
}
},
“A7-A8”: {
“channels”: 2,
“timescale”: [
1024,
48000
],
“segments”: [
{
“in”: 0,
“out”: 18750,
“step”: 375,
“stepStructure”: [
{
“in”: 0,
“out”: 46,
“step”: 46
},
{
“in”: 46,
“out”: 375,
“step”: 47
}
]
},
{
“in”: 18750,
“out”: 18842,
“step”: 46
}
],
“representations”: {
“128000”: {
“codec”: “mp4a.40.2”,
“bandwidth”: 128000,
“keyOffset”: 0
}
}
},
“V1”: {
“channels”: 0,
“timescale”: [
1,
25
],
“segments”: [
{
“in”: 0,
“out”: 10025,
“step”: 25
},
{
“in”: 10025,
“out”: 10048,
“step”: 23
}
],
“representations”: {
“2500000”: {
“codec”: “avc1.4D401E”,
“bandwidth”: 2500000,
“keyOffset”: 0
}
}
}
}
}