Watch a live product demo 👀 See how Sanity powers richer commerce experiences

Does Uploading an Identical Image Result in Duplicate Assets?

9 replies
Last updated: Jun 10, 2020
Is it correct that if I upload the exact same image, I won't get duplicate assets? For every upload I do of the same image, it returns a result with the exact same
_id
and
url
, and
count(*[_type == "sanity.imageAsset"])
doesn't change.This is the behavior I want, but I would assume it uploaded a new asset for each attempt, and didn't do a compare or something. So just want to confirm this behavior before I rely upon it.
🙂
Apr 8, 2020, 11:08 AM
Yes, it’s correct and you can expect it to be consistent, reliable behaviour. Just confirmed with
user A
:
If we already have an image with the same hash it’s not stored and we’ll return the asset id of the existing one
Apr 8, 2020, 11:36 AM
Thanks
user M
! Thats very cool! 🙂
Apr 8, 2020, 11:42 AM
user M
How does this know it is the same image? Does it look for the
originalFilename
?
Jun 3, 2020, 4:05 PM
It uses a cryptographic hash function (SHA-1) to calculate a hash value on upload - if hash values are the same, the image is considered identical and not stored but instead linked from the existing one.
Jun 3, 2020, 4:35 PM
user M
So does it still replace the image file with the current one being uploaded, or does it just ignore the request altogether and keep using the "old" file if it matches an existing asset?
Jun 3, 2020, 6:12 PM
It will keep using the existing (old) file, as it’s identical, so no need to replace 🙂
Jun 3, 2020, 6:17 PM
Gotcha. So does that mean there's no way to replace the file for an existing asset? It has to be deleted and then another one created?
Jun 3, 2020, 6:23 PM
And if that's the case, can a custom ID for the asset be specified on upload so that it can match the old asset that was deleted to keep references on documents intact?
Jun 3, 2020, 6:27 PM
user M
Was still wondering if you had an answer here. Is there no way to make an existing asset ID use a new uploaded file?
Jun 10, 2020, 4:14 PM

Sanity– build remarkable experiences at scale

The Sanity Composable Content Cloud is the modern headless CMS that treats content as data to power your digital business. Free to get started, and pay-as-you-go on all plans.

Categorized in

Related answers

Get more help in the community Slack

TopicCategoriesFeaturedRepliesLast Updated
After adding the subtitle and running this code npm run graphql-deploy It does nothingSep 15, 2020
how to limit a reference to just one entry in Studio reference input side versus the default as-many-entries-as-you-fill-in-an-array...Sep 18, 2020
Is it possible to fetch more than one "_type" using GROQ?Nov 2, 2020
I want to add a view with the Structure builder (S.view.component) where I list similar documents based on the title. What...Sep 23, 2020
Is there a structure builder example where the format of each preview for the document list is modified?Feb 3, 2021
I have an array of references to a country schema type but it always just returns NULL values for meJan 30, 2021
Hi, I need help with a query for getting the url of an image asset. Here is what I've been trying, but I only get the _ref...Dec 1, 2020
Sanity UI looks brilliant :smiley: Is something like the current date picker possible at the moment? I’m not sure if anicon...Dec 21, 2020
Hey everyone. I have been coding and may have potentially accidentally deleted something. Does anyone know how to resolve...Dec 26, 2020
Hello everyone and happy new year :raised_hands::skin-tone-2:, I have a problem with outputting Portable Text :disappointed:...Jan 1, 2021

Related contributions

Clean Next.js + Sanity app
- Template

Official(made by Sanity team)

A clean example of Next.js with embedded Sanity ready for recomposition.

Cody Olsen
Go to Clean Next.js + Sanity app

Blog with Built-in Content Editing
- Template

Official(made by Sanity team)

A Sanity-powered blog with built-in content editing and instant previews.

Go to Blog with Built-in Content Editing