README.md

sails-through-error

A repository for issue #3946 in Sails.

This project was set up to expose (what seems to be) an error in SailsJS. Specifically, it exposes a bug when using the through attribute between two models.

The Bug

To reproduce this bug, simply use the sails CLI to generate three models where two are related using the through attribute property, and the third being the model holding the relationship. The best is to reproduce #has-many-through-example. To best experience the bug, make the pet and owner attributes required.

Once the attributes of the model are ready, create the records required to fill all tables. Then update a user record while setting the pets to a value such as 1 or [1]. This can be done by running an HTTP PUT request to the existing user which sails will understand as an update request, then apply the necessary headers. The server will return a 400 error saying there was a missing value for the middle model.

This App

I created this app which you can clone yourself. This app already has the necessary models needed with the attributes ready and a record is automatically inserted into each model's table. Once you clone this application, run node app.js and run an HTTP PUT request with the following properties:

• URL: http://localhost:1337/user/1
• Headers:
  • Body:
    • x-www-form-urlencoded (I got this from Postman)
      • name: John Doe II
      • pets: [1]

The above POST request results in the following error:

invalidAttributes": {
    "owner": [
      {
        "rule": "required",
        "message": "\"required\" validation rule failed for input: null\nSpecifically, it threw an error.  Details:\n undefined"
      }
    ]
  },
  "model": "PetUser",
  ---