gatsby-theme-blog generate invalid URL for post slug

[malcolm-kee]

Description

The slug for post in gatsby-theme-blog are invalid URL when using windows.

This is due to the code that use path.join to create slug at https://github.com/gatsbyjs/gatsby/blob/master/themes/gatsby-theme-blog/gatsby-node.js#L171, which is fine in unix but problematic in windows because path.join returns backslash in windows.

Steps to reproduce

In windows machine, run:

gatsby new my-blog https://github.com/gatsbyjs/gatsby-starter-blog-theme

Then

npm start

Then you should be able to see the links on the home page is incorrect.

Expected result

The slug for post should be valid URL.

Actual result

Environment

System:
OS: Windows 10
CPU: (4) x64 Intel(R) Core(TM) i5-6500 CPU @ 3.20GHz
Binaries:
Yarn: 1.16.0 - C:\Program Files (x86)\Yarn\bin\yarn.CMD
npm: 6.9.0 - C:\Program Files\nodejs\npm.CMD
Browsers:
Edge: 44.17763.1.0
npmPackages:
gatsby: ^2.13.6 => 2.13.6
gatsby-theme-blog: ^1.0.0 => 1.0.0

[malcolm-kee]

I can work on the fix once someone can confirm this is valid bug (not due to my misunderstanding 😅)

[LekoArts]

Ward is working on a fix 👍🏻
#15370

[LekoArts]

Should be fixed now with #15370

[bravo-kernel]

I just created a fresh gatsby-starter-blog-theme on Windows but am having the same problem. Should I do something to pull in the changes?