Added support for additional labels (multi-tenancy via labels)

[cmartin81]

I've implemented ability to add additional labels inside the schema for objects. The implementation is inspired by issue #237 (Auth support for multi-tenant graphs implemented via node labels)

Example of usage:
Use directive @additionalLabels which has 1 parameter 'labels' .
Labels is an array of strings. It also supports string interpolation (See example under) using lodash.template lib. The varible $cypherPrams is also accessible within the string

type Movie @additionalLabels(labels: ["u_<%= $cypherParams.userId %>", "newMovieLabel"])  {
    id: String
    name: String
    ...
    ...
    ...

When creating, updating or deleting it will add 2 new labels to the query. For this case it will be u_123 and newMovieLabel given that $cypherParams.userId = 123. This way it should be possible to add multi-tenant graph via labels.)
Labels are only applied on node (not edges)

Tests have been changed and all 110 are passing

[cmartin81]

I fixed the CI script myself since it was inside the source code :)

[cmartin81]

I'm using this for the last week and it looks like everything works great.
Are there anything I can do to get this PR accepted?

[johnymontana]

Hey @cmartin81 - thanks for the PR.

This is really neat when combined with cypherParams. I left just a minor request for changes in the test-all npm script, but otherwise, I think this is good to go.

We may want to rethink how this is handled when Neo4j v4.0 is released, which will include new access control features, but since this is useful for your use case I think it will be useful for others as well.

Would you mind adding another PR to the docs showing how to use this? Probably as an additional item in this file. Thanks!

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@a3376c4). Click here to learn what that means.
The diff coverage is 100%.

@@            Coverage Diff            @@
##             master     #282   +/-   ##
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  Coverage          ?   86.45%           
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  Files             ?       10           
  Lines             ?     2348           
  Branches          ?        0           
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  Hits              ?     2030           
  Misses            ?      318           
  Partials          ?        0

Impacted Files	Coverage Δ
src/selections.js	87.35% <ø> (ø)
src/utils.js	93.17% <100%> (ø)
src/translate.js	98.64% <100%> (ø)

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[cmartin81]

Here you can see. The failing tests have nothing to do with my work.

[johnymontana]

Sorry about that, that was my fault :-\

I've fixed the integration tests and merged this in. Thanks for adding this feature!

[cmartin81]

Great! Thanks!
Remember that I have updated the docs and made an PR.
grand-stack/grandstack.io#3