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Understanding Groq queries in Sanity.io Slack thread

14 replies
Last updated: Feb 26, 2021
hey guys! i have a groq question... is this possible? `
*[_type == 'collection' && *[items && slug.current == 'look-1']]

items
is an array of objects under a 
collection
.. i want to get the collection that has that 
item
of a particular slug 🙏
Feb 25, 2021, 5:57 PM
*[_type == 'collection' && 'look-1' in items[].slug.current]
I think that does what you're looking for, assuming that 
slug
is a property of each 
item
in 
items
Feb 25, 2021, 6:18 PM
That query is essentially doing an array map on 
items
to make an array of all the slugs, and then checking if any of them match 'look-1'
Feb 25, 2021, 6:19 PM
will the 
^
operator also work? context:
[...*[_type == 'collection'].items] {
        'collectionSlug': ^.slug.current,
        'itemSlug': slug.current,
      },
in getStaticPaths for /[collection]/[item]
Feb 25, 2021, 6:20 PM
nope 🤔 i need to read up more on this 😄
Feb 25, 2021, 6:22 PM
... 
[...*[_type == 'collection'].items]
doesnt work... how do i flatten all items of all collections ?
Feb 25, 2021, 6:38 PM
Feb 25, 2021, 7:21 PM
If you want to get all collections which have a property 
items
which contains a slug, then I'm pretty sure I was on the right track. It sounds like you want to do something different though?
Feb 25, 2021, 8:36 PM
If you are trying to bring back a particular 
item
in the 
items
array within your 
collection
results, based on a slug you provide, then you could actually do that within the projection:
*[_type == 'collection']{
   ...,
   "targetItem": items[slug.current == $slug]
}
Would that not work for you? I'm not 100% sure what you are trying to do, so I'm kind of taking a shot and seeing if I get it right here
😄
Feb 25, 2021, 8:40 PM
omg!
Feb 25, 2021, 8:42 PM
i think that's it! didn't know the syntax 
items[conditional here]
!
Feb 25, 2021, 8:43 PM
will give it a go, thank you djeglin
Feb 25, 2021, 8:43 PM
Yeah... So, because projections are just groq statements in and of themselves, you can use the filter (like you do to start your query) inside it. You're replacing the 
*
(which is the array to filter) with 
items
here, so the filter operates against that child array of the item being projected. I'm using it in a couple of places in the project I'm working on at the moment
Feb 25, 2021, 8:45 PM
thank you so much
user M
! very greatful for spending the time to explain it to me too 🙂 i learned something new!
Feb 26, 2021, 8:02 AM
No problem! I ask questions all the time... The least I can do is try to help others where I can in return 😃
Feb 26, 2021, 12:09 PM

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