Gemini API [400 Bad Request] - Array fields breaks function calling

[ppm]

Using the node.js SDK: @Google/generative-ai@0.14.0

This function declaration worked well one day or two days ago, but now it's broken.

```

{

  name: "cancelReminders",

  description: "Cancel some reminders.",

  parameters: {

    type: FunctionDeclarationSchemaType.OBJECT,

    properties: {

      ids: {

        type: FunctionDeclarationSchemaType.ARRAY,

        description: "An array of string IDs of the reminders that the user wants to cancel.",

        nullable: false,

        properties: {}

      },

    },

    required: ["ids"],

  },

}

```

Error message:

[GoogleGenerativeAI Error]: Error fetching from https://generativelanguage.googleapis.com/v1beta/models/gemini-1.5-pro-latest:generateContent: [400 Bad Request] Request contains an invalid argument.

How can I correctly set up array fields?

[abhinavMaple]

were you able to solve it, im getting the same error

[abhinavMaple]

were you able to solve it???

[AFirstenberg · Accepted solution]

Although you have `ids` set to be an array, you don't specify what type of array it should contain.

You can specify the type using the `items` attribute of the definition.

See https://ai.google.dev/api/rest/v1beta/cachedContents#schema

So that part might look something like:

      ids: {
        type: FunctionDeclarationSchemaType.ARRAY,
        description: "An array of string IDs of the reminders that the user wants to cancel.",
        nullable: false,
        properties: {},
        items: {
          type: "STRING",
          description: "The ID of the reminder the user wants to cancel",
          nullable: false
        }
      },

[ppm]

Thanks! This solves my problem.