Conditionally requiring fields using oneOf

[abbasegbeyemi]

Thank you so much for this library. It is absolutely amazing.

I have a schema where at least one field is required. The JSON schema looks like this as an example.

 type: "object",
      $schema: "http://json-schema.org/draft-07/schema#",
      $id: "testform",
      properties: {
        favouriteColour: {
          default: "",
          type: "string",
        },
        favouriteFruit: {
          default: "",
          type: "string",
        },
      },
      required: ["name", "age"],
      oneOf: [
        {
          required: ["favouriteColour"],
        },
        {
          required: ["favouriteFruit"],
        },
      ],
    };

The rules are not getting applied in Yup. I know the examples show oneOf being used to conditionally type a property, but I was wondering if there was a way to use it like this.

Another question I have is - when I define a schema like below:

 const testSchema = {
      type: "object",
      $schema: "http://json-schema.org/draft-07/schema#",
      $id: "testform",
      properties: {
        likes: {
          type: "array",
          default: [],
          minItems: 2
          maxItems: 4,
        },
      },

When I don't include the likes field in the validation data, a validation error is raised that the array field has to have the minimum elements. I have not included the property name in the array of required elements, so I would expect that the validation should only fail if the element is not an empty list? Can you please explain what I am doing wrong in this case? Thanks.

[ritchieanesco]

@abbasegbeyemi thanks for raising this issue. A fix has been made and published (json-schema-yup-transformer@1.6.6-beta.2). Validation only executes when field and field value are present.

Based on your schema these are valid.

    valid = yupschema.isValidSync({});
    expect(valid).toBeTruthy();

    valid = yupschema.isValidSync({likes: undefined});
    expect(valid).toBeTruthy();

   valid = yupschema.isValidSync({ likes: [1,2,3] });
   expect(valid).toBeTruthy();

Based on your schema these are NOT valid.

    valid = yupschema.isValidSync({ likes: [] });
    expect(valid).toBeFalsy();

    valid = yupschema.isValidSync({likes:[ 1 ]});
    expect(valid).toBeFalsy();

    valid = yupschema.isValidSync({likes:[ 1, 2, 3, 4, 5 ]});
    expect(valid).toBeFalsy();