Multi-value attributes in YAML front matter

[macdrifter]

I've tried several options to generate a LIST with Dataview using multi-value attributes in my YAML headers but DV does not seem to recognize them.

User story: I would like to generate a list of all notes that reference a specific person that was in attendance. I use YAML front matter in my meeting notes with a key of "contact" that has a list of all people were present in the meeting.

Here is some example text where I have tried to test every supported YAML list format (and some unsupported). I've tried multiple variations of quotes as well but without ever generating a list with Dataview

---
contact: ["Jim", "Fred", "Betty", "Beth"]
people: [Jim Fred Betty Beth]
person: 
  - Jim
  - Fred
  - Betty
  - Beth
person2:
- Jim
- Fred
- Betty
- Beth
date: 2021-08-07 10:56:59
type: Testing
---

I've tried all of the below queries but they produce no results.

LIST
WHERE contact="Fred"

LIST
WHERE people="Fred"

LIST
WHERE person="Fred"

LIST
WHERE person2="Fred"

[M-bot]

I believe contact, person, and person2 are correct YAML. The = equality operator does not check if a YAML collection (what you called a multi-value attribute) contains a value. To check if a YAML collection contains exactly a value use the dataview function econtains (this used to be called just contains)

```dataview
list
where econtains(contact, "Fred")
```

The docs still call econtains by its old name contains but they still accurately describe the function. (contains in the latest release does something slightly different)

[macdrifter]

Oh, thank you so much for pointing this out. A little disappointing that I'd need to know before doing the search if there are more than one value. But it looks like if I always use the econtains function instead of equality then it doesn't matter if there's a single value or multiple.

Thanks again for responding.