schematic(table): Cannot read property 'data' of undefined

[b-mi]

What is the expected behavior?

Do not work, ends with error "Cannot read property 'data' of undefined"

What is the current behavior?

Without error

What are the steps to reproduce?

Providing a StackBlitz reproduction is the best way to share your issue.

StackBlitz starter: https://goo.gl/wwnhMV

Bad generated code:

  ngAfterViewInit() {
    this.dataSource = new InfoOProgDataSource(this.paginator, this.sort);
  }

Correct code:
  ngOnInit() {
    this.dataSource = new InfoOProgDataSource(this.paginator, this.sort);
  }

Which versions of Angular, Material, OS, TypeScript, browsers are affected?

Updated angular, material 7.3.7

Is there anything else we should know?

Better testing?

[Splaktar]

Do you have a full stack trace to share?

[Splaktar]

OK, I was able to reproduce this:

ERROR TypeError: Cannot read property 'data' of undefined
    at TableComponent_Template (template.html:20)
    at checkView (core.js:8963)
    at componentRefresh (core.js:8772)
    at refreshChildComponents (core.js:7896)
    at refreshDescendantViews (core.js:7836)
    at checkView (core.js:8964)
    at componentRefresh (core.js:8772)
    at refreshChildComponents (core.js:7896)
    at refreshDescendantViews (core.js:7836)
    at renderComponentOrTemplate (core.js:8099)

[devversion]

Issue can be fixed by using Angular's safe navigation operator when accessing the dataSource property.

https://github.com/angular/material2/blob/309d5644aa610ee083c56a823ce7c422988730e8/src/lib/schematics/ng-generate/table/files/__path__/__name%40dasherize%40if-flat__/__name%40dasherize__.component.html#L19-L24

Right now the [length] binding fails because dataSource is undefined until the view is initialized completely.

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