[Bug Report] NavMenu broken in 1.4.0-beta.1

[smares]

Element UI version

1.4.0-beta.1

OS/Browsers version

Chrome Version 59.0.3071.115 (Official Build) (64-bit)

Vue version

2.4.1

Reproduction Link

https://jsfiddle.net/2fwn5qq1/

Steps to reproduce

Add a NavMenu element and open the page

What is Expected?

The NavMenu should appear

What is actually happening?

Errors "Avoid using non-primitive value as key, use string/number value instead." and "Error in created hook: "TypeError: Cannot read property 'addItem' of undefined"" displayed in the console and the NavMenu does not appear

[Leopoldthecoder]

Thanks for your quick feedback.

In 1.4.0 we added a key, which is a Boolean, to Menu. That's why the warning comes out. It seems next Vue version will support Boolean typed keys: vuejs/vue#6127 , but still we'll convert it to a string/number.

[Leopoldthecoder]

Oh, also this bug is related to vuejs/vue#6093

[Leopoldthecoder]

Fixed in #5970