Martian Mod

[Michel Fortes]

Claro! Aqui está a tradução para o inglês em um tom técnico e cordial:

---

Hello everyone,

I'd just like to double-check something: in the "Martian Modifier", it's not possible to use the same package more than once since it's a map, right?

In the example below, the second "header.Modifier" will overwrite the first one, correct?

"modifier/martian": {
    "header.Modifier": {
        "scope": ["response"],
        "name": "XPTO",
        "value": "some value"
    },
    "header.Modifier": {
        "scope": ["response"],
        "name": "ABC",
        "value": "another value"
    }
}

Best! 

[Albert Garcia]

Hi Michel,

You are right that in the Martian modifier configuration, a map cannot have duplicate keys, so multiple "header.Modifier" entries will overwrite each other and only the last one takes effect. To apply multiple header modifications or other modifiers, you should use a group modifier such as fifo.Group or priority.Group: https://www.krakend.io/docs/backends/martian/#groups-apply-multiple-modifiers

This will allow you to list several modifiers in order under a modifiers array, each with their own configuration, avoiding key overwrite issues. For example: 

"modifier/martian": {
  "fifo.Group": {
    "scope": ["response"],
    "modifiers": [
      {
        "header.Modifier": {

          "name": "XPTO",
          "value": "some value",

          "scope": ["response"]
        }
      },
      {
        "header.Modifier": {
          "name": "ABC",
          "value": "another value",
          "scope": ["response"]
        }
      }
    ]
  }
}

 

Hope it works!

[Michel Fortes]

Hello, Albert.

Thank you very much for the clarification.
I completely forgot to check the next section of the documentation — precisely the one that would help me with the issue.

Thank you so much for shedding light on this point.

Best!