Adding validation for featured content and sorting an array by date in Sanity schema.

Hello there, i have a schema in which a field of

boolean

contain named as isFeatured. Now i want to do validation like if isFeatured is true in any doument, i shouldn't be able to make isFeatured true in any other document and it should show which document has already isFeatured true. How to add this kinda validation. Thanks.

Would be better to use a reference to the featured item from the content type on which another appears as featured? For example, if you wanted to feature a blog post on the home page, the home page would have a field for FeaturedItem where the content manager could select the appropriate blog post as a reference.
This is how i approach featured content 95% of the time. It saves on maintenance because you only have to go to one place to select the new featured item and you lose the risk that people will select too many items as featured.

Hi Thanks for your response, another thing i want to ask is that i have an array of object and i want to order by

dateOfPublication

which is a value in objects. I am unable to write query for it.
Here's the structure,

{

"_createdAt":"2021-12-08T09:17:40Z"

"_rev":"XXZQtLc37Lz6XK4fvqH5Wt"

"_type":"newsArticleBlock"

"_updatedAt":"2021-12-09T12:51:56Z"

"newsCardBlock":*[*

{

"_key":"85b48badc2c2"

"_type":"newsArticle"

"articleDescription":*[*...*]*_1 item_

"articleImage":*{*...*}*

"ctaLink":*{*...*}*

"isFeatured":true

"selectedCategory":*{*...*}*_2 items_

"slug":*{*...*}*_2 items_

"subHeadline":"The NRP Group subheading"

}

*{*...*}*

*{*...*}*

*{*...*}*

]

}

Hi Mohammad. You can sort your array using the

order()

function. There are some details here but if you want to post your schema we can probably show you where you’d add it.