--- title: Foolproof uniqueness validations in Phoenix with Ecto description: Learn how to validate uniqueness in Phoenix with Ecto using the unique_constraint/3 function and handle race conditions gracefully. canonical: https://daily.dev/posts/foolproof-uniqueness-validations-in-phoenix-with-ecto-yjxbu29dj twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Foolproof uniqueness validations in Phoenix with Ecto | daily.dev og:description: Learn how to validate uniqueness in Phoenix with Ecto using the unique_constraint/3 function and handle race conditions gracefully. og:url: https://daily.dev/posts/foolproof-uniqueness-validations-in-phoenix-with-ecto-yjxbu29dj og:image: https://api.daily.dev/og/posts/YjxBu29dJ.png og:image:alt: Foolproof uniqueness validations in Phoenix with Ecto og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Foolproof uniqueness validations in Phoenix with Ecto **[Community Picks](https://daily.dev/sources/community)** · 9 min read · 3 upvotes · 0 comments ## Summary Learn how to validate uniqueness in Phoenix with Ecto using the unique_constraint/3 function and handle race conditions gracefully. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: --- Tags: [#database](https://daily.dev/tags/database), [#elixir](https://daily.dev/tags/elixir), [#ecto](https://daily.dev/tags/ecto) [View this post on daily.dev](https://daily.dev/posts/foolproof-uniqueness-validations-in-phoenix-with-ecto-yjxbu29dj) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Foolproof uniqueness validations in Phoenix with Ecto","url":"https://daily.dev/posts/foolproof-uniqueness-validations-in-phoenix-with-ecto-yjxbu29dj","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/foolproof-uniqueness-validations-in-phoenix-with-ecto-yjxbu29dj"},"datePublished":"2024-03-21T10:08:08.577Z","dateModified":"2024-05-09T09:06:08.895Z","description":"Learn how to validate uniqueness in Phoenix with Ecto using the unique_constraint/3 function and handle race conditions gracefully.","image":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/dc85766fed1db8fdf6842f08de0de48c?_a=AQAEufR","thumbnailUrl":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/dc85766fed1db8fdf6842f08de0de48c?_a=AQAEufR","isAccessibleForFree":true,"articleSection":"Community Picks","inLanguage":"en","publisher":{"@type":"Organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180}},"author":{"@type":"Organization","name":"Community Picks","logo":"https://media.daily.dev/image/upload/t_logo,f_auto/v1655817725/logos/community","url":"https://daily.dev/sources/community"},"commentCount":0,"discussionUrl":"https://daily.dev/posts/foolproof-uniqueness-validations-in-phoenix-with-ecto-yjxbu29dj","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":3},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"database,elixir,ecto","timeRequired":"PT9M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"Community Picks","item":"https://daily.dev/sources/community"},{"@type":"ListItem","position":3,"name":"Foolproof uniqueness validations in Phoenix with Ecto"}]} ```