Save a board as a template

[rtxm]

Expected behavior

If a custom template directory is configured, we allow users to save the current board as a template. The template becomes available to all users.

On a board, in the board menu, a new entry is available for board owners: Save as template.
When a user clicks on that entry, a pop-up appears asking whether the template is personnal or public.
The new template appears in the list to create boards from on the user's home and, if public, on all users'.

Technical notes

Use a kind of delegation pattern: each level (board, column, card) is responsible for exporting its own JSON fragment.

Use AssetManager to store templates.
Create a new relation in DB between user, board, template asset UUID and a boolean (shared indicator).

[vrialland]

Here is the full list of data stored in boards, columns and cards, those exported are prepended with ✅

Board

• ✅ Title
• ✅ Description
• URI
• Background image
• Background image position
• Title color
• Comments allowed
• Votes allowed
• Visibility (private or public)
• Show archive column
• Weights activated
• Weights list
• ✅ Columns
• ✅ Labels

Label

• ✅ Title
• ✅ Color

Column

• ✅ Title
• Max cards
• ✅ Cards

Card

• ✅ Title
• ✅ Description
• Votes
• ✅ Labels
• ✅ Comments (are attached to the user importing the template)
• Assets
• ✅ Checklists
• Cover image
• ✅ Due date
• Weight

Comment

• ✅ Comment

Checklist

• ✅ Title
• ✅ Items

Checklist item

• ✅ Title
• ✅ Done

[vrialland]

TODO : update to these values

Board

• ✅ Title
• ✅ Description
• URI
• ✅ Background image
• ✅ Background image position
• ✅ Title color
• ✅ Comments allowed
• ✅ Votes allowed
• Visibility (private or public)
• Show archive column
• ✅ Weights activated
• ✅ Weights list
• ✅ Columns
• ✅ Labels

Label

• ✅ Title
• ✅ Color

Column

• ✅ Title
• ✅ Max cards
• ✅ Cards

Card

• ✅ Title
• ✅ Description
• Votes
• ✅ Labels
• Comments
• ✅ Assets
• ✅ Checklists
• ✅ Cover image
• Due date
• ✅ Weight

Comment

• ✅ Comment

Checklist

• ✅ Title
• ✅ Items

Checklist item

• ✅ Title
• Done

Others

• Export overlay:
  • Use radio buttons for export.
  • Put a warning if user exports a board for all users if it is private
  • Add a visual feedback in the export overlay, a waiter then a confirmation message
• Add a title and a description on the export that will appear in the templates list
• A template is stored in database as a board with a flag indicating it is a template, except for its assets

[vrialland]

Replaced by #97