classDiagram cardinality not showing

[ruizmarc]

Hi,

I'm using mermaid 7.0.17 in a classDiagram and I'm trying to show cardinality following the example in the specs. However cardinality is not being showed. I know it is an experimental feature, but I think it is worth to mention the problem to take it into consideration.

This is an example of how I'm using cardinality:

User "1" *-- "many" Session

EDIT: Also tested with 7.1

[Vrixyz]

As main maintainer is not available to fix that for the moment, I suggest delving into details here, so it helps him or whoever has time to fix it.

I'll post my findings in this issue, and eventually I might look into submit a Merge Request.

Technical understanding

Parser

From my understanding of classDiagram parser : the parsing of cardinality looks like it's done within STR, then transformed into properties relationTitle1 and relationTitle2, so my guess is we don't have to improve on classDiagram.jison 🎉

Renderer initialization

For each relations, the whole relation object we saw in the parser is passed to the "edge" within the graphlib graph. So we don't have to worry about how to pass our information to multiple layers of functions 🎉

Renderer last run

Next let's check the drawEdge function

We notice there is a title attached to a relation, its origin is not relevant but here it is

Here begins some maths, somewhere from there there is magical code to put the title at half the length of the edge/path/relation, that will be useful to help us add code for our awaited cardinality to appear! 🎉

I'll continue if/when I have time, maths without comments scared me out 🐇 . At least I think I know exactly where to input code to make cardinality to work!

[stale]

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