The latest articles on DEV Community by Khalil Gharbaoui (@khalilgharbaoui). https://dev.to/khalilgharbaoui https://media2.dev.to/dynamic/image/width=90,height=90,fit=cover,gravity=auto,format=auto/https:%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Fuser%2Fprofile_image%2F109665%2F14964ebd-d1b8-406a-8e0a-0607822a4787.jpeg https://dev.to/khalilgharbaoui en Khalil Gharbaoui Wed, 04 Dec 2019 09:03:09 +0000 https://dev.to/khalilgharbaoui/answer-a-migration-to-add-unique-constraint-to-a-combination-of-columns-5h62 https://dev.to/khalilgharbaoui/answer-a-migration-to-add-unique-constraint-to-a-combination-of-columns-5h62 <div class="ltag__stackexchange--container"> <div class="ltag__stackexchange--title-container"> <div class="ltag__stackexchange--title"> <h1> <img src="https://res.cloudinary.com/practicaldev/image/fetch/s--pTF_nE4a--/c_limit%2Cf_auto%2Cfl_progressive%2Cq_auto%2Cw_880/https://practicaldev-herokuapp-com.freetls.fastly.net/assets/stackoverflow-logo-b42691ae545e4810b105ee957979a853a696085e67e43ee14c5699cf3e890fb4.svg" alt=""> <a href="https://stackoverflow.com/questions/3370271/a-migration-to-add-unique-constraint-to-a-combination-of-columns/59153244#59153244" rel="noopener noreferrer"> <span class="title-flare">answer</span> re: A migration to add unique constraint to a combination of columns </a> </h1> <div class="ltag__stackexchange--post-metadata"> <span>Dec 3 '19</span> </div> </div> <a class="ltag__stackexchange--score-container" href="https://stackoverflow.com/questions/3370271/a-migration-to-add-unique-constraint-to-a-combination-of-columns/59153244#59153244" rel="noopener noreferrer"> <img src="https://res.cloudinary.com/practicaldev/image/fetch/s--5MiFESHx--/c_limit%2Cf_auto%2Cfl_progressive%2Cq_auto%2Cw_880/https://practicaldev-herokuapp-com.freetls.fastly.net/assets/stackexchange-arrow-up-eff2e2849e67d156181d258e38802c0b57fa011f74164a7f97675ca3b6ab756b.svg" alt=""> <div class="ltag__stackexchange--score-number"> 4 </div> <img src="https://res.cloudinary.com/practicaldev/image/fetch/s--Rk_a5QFN--/c_limit%2Cf_auto%2Cfl_progressive%2Cq_auto%2Cw_880/https://practicaldev-herokuapp-com.freetls.fastly.net/assets/stackexchange-arrow-down-4349fac0dd932d284fab7e4dd9846f19a3710558efde0d2dfd05897f3eeb9aba.svg" alt=""> </a> </div> <div class="ltag__stackexchange--body"> <p>For completeness sake, and to avoid confusion here are 3 ways of doing the same thing:<br> <strong>Adding a named unique constraint to a combination of columns in Rails 5.2+</strong></p> <p>Let's say we have Locations table that belongs to an advertiser and has column reference_code and you only want 1 reference…</p> </div> <div class="ltag__stackexchange--btn--container"> <a href="https://stackoverflow.com/questions/3370271/a-migration-to-add-unique-constraint-to-a-combination-of-columns/59153244#59153244" rel="noopener noreferrer">Open Full Answer</a> </div> </div> Khalil Gharbaoui Wed, 02 Oct 2019 17:06:38 +0000 https://dev.to/khalilgharbaoui/answer-how-do-i-generate-a-random-10-digit-number-in-ruby-5ej https://dev.to/khalilgharbaoui/answer-how-do-i-generate-a-random-10-digit-number-in-ruby-5ej <div class="ltag__stackexchange--container"> <div class="ltag__stackexchange--title-container"> <div class="ltag__stackexchange--title"> <div class="ltag__stackexchange--header"> <img src="https://media.dev.to/dynamic/image/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto/https%3A%2F%2Fdev.to%2Fassets%2Fstackoverflow-logo-b42691ae545e4810b105ee957979a853a696085e67e43ee14c5699cf3e890fb4.svg" alt=""> <a href="https://stackoverflow.com/questions/34565/how-do-i-generate-a-random-10-digit-number-in-ruby/55379711#55379711" rel="noopener noreferrer"> <span class="title-flare">answer</span> re: How do I generate a random 10 digit number in ruby? </a> </div> <div class="ltag__stackexchange--post-metadata"> <span>Mar 27 '19</span> </div> </div> <a class="ltag__stackexchange--score-container" href="https://stackoverflow.com/questions/34565/how-do-i-generate-a-random-10-digit-number-in-ruby/55379711#55379711" rel="noopener noreferrer"> <img src="https://media.dev.to/dynamic/image/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto/https%3A%2F%2Fdev.to%2Fassets%2Fstackexchange-arrow-up-eff2e2849e67d156181d258e38802c0b57fa011f74164a7f97675ca3b6ab756b.svg" alt=""> <div class="ltag__stackexchange--score-number"> 4 </div> <img src="https://media.dev.to/dynamic/image/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto/https%3A%2F%2Fdev.to%2Fassets%2Fstackexchange-arrow-down-4349fac0dd932d284fab7e4dd9846f19a3710558efde0d2dfd05897f3eeb9aba.svg" alt=""> </a> </div> <div class="ltag__stackexchange--body"> <p><code>('%010d' % rand(0..9999999999)).to_s</code></p> <p>or</p> <p><code>"#{'%010d' % rand(0..9999999999)}"</code></p> </div> <div class="ltag__stackexchange--btn--container"> <a href="https://stackoverflow.com/questions/34565/how-do-i-generate-a-random-10-digit-number-in-ruby/55379711#55379711" class="ltag__stackexchange--btn" rel="noopener noreferrer">Open Full Answer</a> </div> </div>