No numbering when using parts

Describe the bug

context When I do split my TOC into parts, the previously working numbering is gone.

expectation I expected numbering to continue to exist after splitting TOC into parts.

bug But instead all numbering is gone, despite still having the numbering setting set.

Reproduce the bug

TOC that works for numbering:

format: jb-book
root: intro
options:
  numbered: true
chapters:
  - file: 01_uvis_on_pds
  - file: 02_pds_data_structure
  - file: 03_calibration
  - file: bibliography
  - file: Appendix1_Flatfielding
  - file: Appendix2

TOC that doesn’t work:

format: jb-book
root: intro
options:
  numbered: true
parts:
  - caption: Part 1
    chapters:
      - file: 01_uvis_on_pds
      - file: 02_pds_data_structure
      - file: 03_calibration
      - file: bibliography
  - caption: Part 2
    chapters:
      - file: Appendix1_Flatfielding
      - file: Appendix2

List your environment

GH workflow install via requirements

jupyter-book --version Jupyter Book : 0.12.1 External ToC : 0.2.3 MyST-Parser : 0.15.2 MyST-NB : 0.13.1 Sphinx Book Theme : 0.1.10 Jupyter-Cache : 0.4.3 NbClient : 0.5.10

• Python 3.8
• OS:
  • Ubuntu
  • 20.04.3
  • LTS

GH workflow:

jobs:
  build-and-deploy-book:
    runs-on: ${{ matrix.os }}
    strategy:
      matrix:
        os: [ubuntu-latest]
        python-version: [3.8]
    steps:
    - uses: actions/checkout@v2

    # Install dependencies
    - name: Set up Python ${{ matrix.python-version }}
      uses: actions/setup-python@v1
      with:
        python-version: ${{ matrix.python-version }}
    - name: Install dependencies
      run: |
        pip install -r requirements.txt
        jupyter-book --version

    # Build the book
    - name: Build the book
      run: |
        jupyter-book build .

    # Deploy the book's HTML to gh-pages branch
    - name: GitHub Pages action
      uses: peaceiris/actions-gh-pages@v3
      with:
        github_token: ${{ secrets.GITHUB_TOKEN }}
        publish_dir: _build/html

[choldgraf]

@michaelaye I don’t believe it’s currently possible, there’s an issue about this over in the Sphinx repo here: https://github.com/sphinx-doc/sphinx/issues/6614

[choldgraf]

Hmm - I was able to reproduce the same error as well. However, manually putting numbered: true underneath each caption entry works, so try that as a stopgap fix:

format: jb-book
root: intro
parts:
  - caption: Part 1
    numbered: true
    chapters:
      - file: 01_uvis_on_pds
      - file: 02_pds_data_structure
      - file: 03_calibration
      - file: bibliography
  - caption: Part 2
    numbered: true
    chapters:
      - file: Appendix1_Flatfielding
      - file: Appendix2