How do we specify denormalization?

[ujwal-setlur]

Hi,

How do we specify denormalization structure with this package?

Thanks

[ujwal-setlur]

I tried the following, but it didn't work:

type ColorMessage @mongo(name: "colorMessages") 
{
  _id: ID!
  color: Color @link(field: "colorId")
  sender: User @link(field: "senderId")
  date: Date!
  recipients: [User] @link(field: "recipientIds")
}

type Color @mongo(name: "colors")
{
  _id: ID!
  name: String
  description: String
  notes: String
  date: Date @map(to: "createdAt")
  rgb: [Int]
  spectrum: [SpectrumPoint]
  owner: User @link(field: "createdBy")
  messages: [ColorMessage] @link(to: "color", autoremove: true, 
    denormalize: {field: "messagesCache", body: {senderId: 1, date: 1, recipientIds: 1}})
}

[ujwal-setlur]

The autoremove is honored, but denormalize is not. Looking at the code in LinkDirective.js, I believe it should be:

    if (args.to) {
      config = Object.assign({}, args);
      config.inversedBy = args.to;
      delete config.to;
    }

thisCollection.addLinks({
      [field.name]: {
        collection: referencedCollection,
        ...config,
      },
    });

If I use direct addLinks API, it works:

Colors.addLinks({
  "messages": {
    collection: ColorMessages,
    inversedBy: "color",
    autoremove: true,
    denormalize: {
      field: "messagesCache",
      body: {
        senderId: 1,
        date: 1,
        recipientIds: 1
      }
    }
  }
});

[ujwal-setlur]

Well, this explains it :-)

directiveDefinitions.js:

  directive @link(
    field: String
    to: String
    metadata: Boolean
    unique: Boolean
    autoremove: Boolean
  ) on FIELD_DEFINITION

Any chances of adding support for denormalize?

[ujwal-setlur]

Aargh! I just saw this at the bottom of the README:

This is a very quick way to setup your schema, however if you need to use denormalisation abilities, and you don't want to give up the sugary directives above:

import { db } from 'meteor/cultofcoders:grapher';

Meteor.startup(() => {
  const userCommentLinker = db.users.getLinker('comments');
  Object.assign(userCommentLinker.linkConfig, {
    denormalize: {},
  });
  userCommentLinker._initDenormalization();
});

Duh, I will try this...

[ujwal-setlur]

Hmm, when I try this:

Meteor.startup(() => {
  // initialize Apollo server
  initialize({}, {
    gui: Meteor.isDevelopment
  });
  // set up denormalization stuff
  const colorMessagesLinker = db.colors.getLinker("messages");
  Object.assign(colorMessagesLinker.linkConfig, {
    denormalize: {
      field: "messagesCache",
      body: {
        senderId: 1,
        date: 1,
        recipientIds: 1
      }
    }
  });
  colorMessagesLinker._initDenormalization();

});

I get this startup error:

W20180823-13:00:22.405(5.5)? (STDERR) /Users/ujwal/.meteor/packages/meteor-tool/.1.7.0_5.rjf80g.ow62r++os.osx.x86_64+web.browser+web.browser.legacy+web.cordova/mt-os.osx.x86_64/dev_bundle/server-lib/node_modules/fibers/future.js:280
W20180823-13:00:22.405(5.5)? (STDERR) 						throw(ex);
W20180823-13:00:22.406(5.5)? (STDERR) 						^
W20180823-13:00:22.406(5.5)? (STDERR)
W20180823-13:00:22.406(5.5)? (STDERR) TypeError: Cannot read property 'isMeta' of undefined
W20180823-13:00:22.406(5.5)? (STDERR)     at Linker.isMeta (packages/cultofcoders:grapher/lib/links/linker.js:92:50)
W20180823-13:00:22.406(5.5)? (STDERR)     at Linker._initDenormalization (packages/cultofcoders:grapher/lib/links/linker.js:370:18)
W20180823-13:00:22.406(5.5)? (STDERR)     at Meteor.startup (imports/startup/server/index.js:41:23)
W20180823-13:00:22.406(5.5)? (STDERR)     at Function.time (/Users/ujwal/Work/seamlz/seamlz-server/.meteor/local/build/programs/server/profile.js:309:28)
W20180823-13:00:22.406(5.5)? (STDERR)     at /Users/ujwal/Work/seamlz/seamlz-server/.meteor/local/build/programs/server/boot.js:427:13
W20180823-13:00:22.407(5.5)? (STDERR)     at /Users/ujwal/Work/seamlz/seamlz-server/.meteor/local/build/programs/server/boot.js:472:5
W20180823-13:00:22.407(5.5)? (STDERR)     at Function.run (/Users/ujwal/Work/seamlz/seamlz-server/.meteor/local/build/programs/server/profile.js:510:12)
W20180823-13:00:22.407(5.5)? (STDERR)     at /Users/ujwal/Work/seamlz/seamlz-server/.meteor/local/build/programs/server/boot.js:470:11

[ujwal-setlur]

OK, this worked:

Meteor.startup(() => {
  // initialize Apollo server
  initialize({}, {
    gui: Meteor.isDevelopment
  });
  // set up denormalization stuff
  const colorMessagesLinker = db.colorMessages.getLinker("color");
  const colorsInverseLinker = db.colors.getLinker("messages");
  colorsInverseLinker._setupVirtualConfig(colorMessagesLinker);
  Object.assign(colorsInverseLinker.linkConfig, {
    denormalize: {
      field: "messagesCache",
      body: {
        senderId: 1,
        date: 1,
        recipientIds: 1
      }
    }
  });
  colorsInverseLinker._initDenormalization();
});

Had to read through linker.js code to figure it out. For denormalization on an inverse link, the direct link has to be explicitly specified first using:

colorsInverseLinker._setupVirtualConfig(colorMessagesLinker);