Default values

[catadch]

I need a validator that inserts default values in the request body AND honors with discriminators, yours does the latter, but not the former. I have found others that are the other way around.

Am I doing something wrong, or is it a know issue that this package does not insert default values from the schema?

[catadch]

My init is this, btw:

swaggerValidation.init('./api/openapi.yaml', { 
    ajvConfigParams: { useDefaults: true },
    ajvConfigBody: { useDefaults: true } 
  }
);

[kibertoad]

It is supported, but you need custom ajv configuration for that. See https://github.com/Zooz/express-ajv-swagger-validation/blob/master/test/express/test-simple-server-with-coercion.js for an example.

[catadch]

Thanks kibertoad - looks like I'm doing the right thing by passing on useDefaults to ajv, but still no joy. An example of a not used default from my schema is:

        cost:
          type: number
          format: int32
          enum: [ 35 ]
          default: 35

express-openapi-validator also uses ajv and inserts this and other defaults ok, but does not support discriminators.

[catadch]

Ok. Done some testing.

If I modify the schema so the Pet type is this:

  Pet:
    required:
      - id
      - name
      - tag 
    properties:
      id:
        type: integer
        format: int64
      name:
        type: string
      tag:
        type: string
        default: Taggy McTagFace

And create an extra test in test/express/middleware-test.js

        it('request with missing parameter should pass validation thanks to default', function (done) {
            request(app)
                .put('/pets')
                .send([{
                    name: 1,
                    //tag: 'tag',
                }])
                .expect(200, function (err, res) {
                    if (err) {
                        throw err;
                    }
                    expect(res.body.tag).to.equal('Taggy McTagface');
                    done();
                });
        });

The "tag" value shoud be defaulted to 'Taggy McTagface', but it isn't, instead we get:
Uncaught AssertionError: expected undefined to equal 'Taggy McTagface'

As an aside, as 'tag' is now required, this test should fail with a 400.

[kobik]

@catadch thanks for reporting the issue.

First of all this is a bug, as we should pass useDefaults by default to ajv.

We'll need to investigate this further.

[hilleer]

Any news on this topic? 😄