Collection items is not unique

[Даниил Пронин]

I trying to create a collection, and items data is not unique.

Here is a quick example on how to reproduce this:

/services/get/collection.js

module.exports = {
	path: '/collection',
	collection: true,
	cache: false,
	template: {
		random: Math.random(),
	}
}

package.json

{
  "private": true,
  "scripts": {
    "services": "dyson services"
  },
  "devDependencies": {
    "dyson": "^1.0.2",
  }
}

Run services:

/usr/local/bin/node /usr/local/lib/node_modules/npm/bin/npm-cli.js run services

> project@0.0.0 services /path/to/project
> dyson services

Registering GET service at /collection
Dyson listening at port: 3000
Resolving response for GET /collection

And got this:

[{"random":0.8456052458929002},{"random":0.8456052458929002},{"random":0.8456052458929002},{"random":0.8456052458929002},{"random":0.8456052458929002},{"random":0.8456052458929002},{"random":0.8456052458929002}]

Items is not unique as you can see. All the same.

Something is missing in my code?

[Lars Kappert]

You should make it dynamic, a function (it's evaluated only once now and set as the value).

[Даниил Пронин]

@webpro thank you, now it's unique:

	template: {
		random: ()=> Math.random(),
	}

[{"random":0.44458511570855785},{"random":0.9926197994943111}]

But can I make all items in template to be unique? Like this:

	template: () => {
		return {
			random: Math.random(),
		}
	}

I tried to do this, but it not makes items values unique.

[Lars Kappert]

Are you saying that with the second example, you get the same value for random each time?

[Даниил Пронин]

Yes.

[Lars Kappert]

But it's a fixed value, not a function anymore, as I've explained above. It evaluates the template, and if collection === true it puts this in an array x times. Going to close this for now, feel free to discuss further.

[Даниил Пронин]

Okay I got it. For me, it was unexpected that g.id from get/users.js from dyson-demo return unique value for each collection item, but not Math.random()

[Lars Kappert]

The difference between g.id and Math.random() is that the former is a reference to a function (which dyson will execute), and the latter is a function call which will pre-populate the property with the return value.