cozy-doctypes

1.91.1 • Public • Published

Doctypes

This repository is meant to bring together methods and functions for doctypes that are shared across several applications.

Document

The Document API is useful when you need to have global models, available across files.

It can be used as a base for other document types (see BankTransaction for example).

How to use it

In the following section, we will see how to deal with a fictitious io.cozy.simpsons doctype (we are developing a konnector to retrieve al the Simpson characters). First, let's create a class Simpson that inherits from Document :

const { Document } = require('cozy-doctypes')

class Simpson extends Document {}

Second, let's specify the doctype:

const { Document } = require('cozy-doctypes')

class Simpson extends Document {}
Simpson.doctype = 'io.cozy.simpsons'

Then we provide a cozy-client-js instance to our class. We are going to use cozy-konnector-libs to get this instance. Take a look at the konnectors documentation to learn more about that.

const { Document } = require('cozy-doctypes')
const { cozyClient } = require('cozy-konnector-libs')

class Simpson extends Document {}
Simpson.doctype = 'io.cozy.simpsons'

Simpson.registerClient(cozyClient)

With this, the class is already usable. For example, we can create a new document:

Simpson.create({
  name: 'Homer'
})

Or get some documents given their ids:

const documents = await Simpson.getAll(['id1', 'id2', 'id3']

Take a look at the Document class to see all the methods it implements.

Special class properties

There are some properties that can be given to Document that have a special meaning.

idAttributes

idAttributes is an array of attributes that are seen as ids. When Document knows that, it becomes able to determine if a given document must be created or updated. This is used in the createOrUpdate method. Let's say that we want the name of our Simpsons to be an id:

Simpson.idAttributes = ['name']

Now, if we do the following:

Simpson.createOrUpdate({ name: 'Homer', description: 'Likes donuts' })

Since we said that name is an id attribute, the document we previously created with the name « Homer » will be updated. But if we do:

Simpson.createOrUpdate({ name: 'Marge', description: "Homer's wife" })

This document will be created, because no document exists with this name.

checkedAttributes

checkedAttributes is an array of attributes. But it is used to determine if a document should be updated or not. Let's say that we want a document to be updated only if its description changed:

Simpson.checkedAttributes = ['description']

Now, if we try to update a document, without changing its description:

Simpson.createOrUpdate({ name: 'Marge', children: ['Bart', 'Lisa', 'Maggie'] })

Then it will not be updated, even if we specified a new children attribute.

createdByApp

createdByApp is the slug of an application / konnector that creates the document. This information is used for cozy metadatas (see the metadatas documentation to learn more). If we provide this, the metadata is automatically added to any created or updated document:

Simpson.createdByApp = 'my-awesome-simpsons-konnector'

Simpson.createOrUpdate({ name: 'Bart' })

The created document will have a cozyMetadata property like this:

{
  "_id": "the_id_generated_by_couchdb",
  "name": "Bart",
  "cozyMetadata": {
    "createdByApp": "my-awesome-simpsons-konnector"
  }
}

Environments

The package.json has both main and browser fields. This allows

  • a nodeJS runtime to run the non transpiled code (async/await are for example supported in nodeJS) which allows for easier to read stacktraces.

  • browser runtimes to use transpiled code

The only caveat here is that we must pay attention to features that we use that are not supported yet in nodeJS, for example

  • the lack of ES6 module support in nodeJS, we have to use module.exports
  • class properties: must bind the methods in the constructor

webpack doc for browser field: https://webpack.js.org/configuration/resolve/#resolvealiasfields

package.json doc for browser field: https://docs.npmjs.com/files/package.json#browser

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