Strapi: Defining relationship

[peeomid]

Node.js version: 9.3.0
npm version: 5.6.0
Strapi version: 3.0.0-alpha.7.2
Operating system: macOS High Sierra 10.13.2

I'm completely new to Strapi and is trying Strapi 3, seems like a great system, but having a bit of issue with defining relationship.

I'm using both the admin and code (follow the docs) to define relationship between 2 models but getting issues with both way, both result in error with strapi and make the server stop running.

Basically I'm having 2 models, Picture and PictureTypes, and want to define many to many relationship between the two.
If I define the relationship through admin, adding a types field like attached pic, it'll add something like this to model settings:

"types": {
      "collection": "pictureTypes",
      "via": "pictures",
      "dominant": true
    }

And so, it results in error in console:

/Applications/MAMP/htdocs/Node/api/dogcatbot/node_modules/mongodb/lib/mongo_client.js:433
          throw err
          ^

TypeError: Cannot read property 'attributes' of undefined
    at Object.getNature (/Applications/MAMP/htdocs/Node/api/dogcatbot/node_modules/strapi-utils/lib/models.js:86:63)
    at _.forEach (/Applications/MAMP/htdocs/Node/api/dogcatbot/node_modules/strapi-mongoose/lib/index.js:219:51)
    at /Applications/MAMP/htdocs/Node/api/dogcatbot/node_modules/lodash/lodash.js:4944:15
    at baseForOwn (/Applications/MAMP/htdocs/Node/api/dogcatbot/node_modules/lodash/lodash.js:3001:24)
    at /Applications/MAMP/htdocs/Node/api/dogcatbot/node_modules/lodash/lodash.js:4913:18
    at Function.forEach (/Applications/MAMP/htdocs/Node/api/dogcatbot/node_modules/lodash/lodash.js:9359:14)
    at _.forEach (/Applications/MAMP/htdocs/Node/api/dogcatbot/node_modules/strapi-mongoose/lib/index.js:218:17)
    at /Applications/MAMP/htdocs/Node/api/dogcatbot/node_modules/lodash/lodash.js:4944:15
    at baseForOwn (/Applications/MAMP/htdocs/Node/api/dogcatbot/node_modules/lodash/lodash.js:3001:24)
    at /Applications/MAMP/htdocs/Node/api/dogcatbot/node_modules/lodash/lodash.js:4913:18
    at Function.forEach (/Applications/MAMP/htdocs/Node/api/dogcatbot/node_modules/lodash/lodash.js:9359:14)
    at mountModels (/Applications/MAMP/htdocs/Node/api/dogcatbot/node_modules/strapi-mongoose/lib/index.js:166:15)
    at NativeConnection.instance.connection.on (/Applications/MAMP/htdocs/Node/api/dogcatbot/node_modules/strapi-mongoose/lib/index.js:307:11)
    at NativeConnection.emit (events.js:159:13)
    at /Applications/MAMP/htdocs/Node/api/dogcatbot/node_modules/mongoose/lib/connection.js:860:13
    at connectCallback (/Applications/MAMP/htdocs/Node/api/dogcatbot/node_modules/mongodb/lib/mongo_client.js:515:5)

And then I add one more attribute to PictureTypes as like in the docs:

"pictures": {
      "collection": "picture",
      "via": "types"
    }

Then try to start the server again, and still get the same error.

Am I doing something wrong here? Or it's a bug? Thanks.

[Aurelsicoko]

@peeomid Can you try to lowercase your collection name?

"types": {
   "collection": "picturetypes",
   "via": "pictures",
   "dominant": true
}

"pictures": {
  "collection": "picture",
  "via": "types"
}

Btw, we are going to merge a new branch that will drastically improve the errors returned by the framework to know exactly what attribute is wrong in your models.

[peeomid]

Hi @Aurelsicoko
Thanks for quick response. I've tried changing it all to lowercase and it works fine now. Seems like that's the issue.

Look forward to merge.

[Aurelsicoko]

Amazing!