How to detect time-overlapping-records in Postgres + Rails
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```ruby Model .where("TSRANGE(?, ?, '()') && TSRANGE(starts_at, ends_at, '()')", starts_at, ends_at) .where.not(id: record_id) .exists? ``` Bot...

Rails ERD diagram visualisation online
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Manual: 1. Go to https://dbdiagram.io/d 2. Click *import* and choose *Import from Rails (schema.rb)* 3. Paste schema.rb content 4. voilĂ 

https://dbdiagram.io/d

How to deal with RSpec time precision error
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In some cases, Ruby uses higher precision to represent time than the DB. When we compare a timestamp before and after saving to the DB it might not be equal.

Rails migration decimal precision scale
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Rails migration decimal precision scale explained quasi visually ``` 123.45678912345 <- scale -> <- precision -> ```

How to use helper methods in mailer templates
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How to use helper methods in mailer templates? Instead of this "include YourHelper" use this "add_template_helper YourHelper" in YourMailer

Example tmux script for Rails
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Shell script that will start a tmux session with Rails console and server in side panes

Compiling ES6 syntax with Uglifier on
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When you try to compile ES6 syntax with Uglifier gem initialized you get this error: ``` Uglifier::Error: (...) To use ES6 syntax, harmony mode must be e...

Brakeman - An awesome gem that scans your app against vulnerabilities.
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To use Brakeman, the only thing is to install the gem: ``` $ gem install brakeman ``` and then run the single command in Rails application's root dir...

https://github.com/presidentbeef/brakeman

Define routes for external links in rails
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You can define external urls in routes.rb instead of creating helpers manually

https://guides.rubyonrails.org/routing.html#direct-routes

How to drop a production database in Rails 5
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I encountered a problem when dropping a production database. Here's the solution

Make RSpec shared examples easier to understand with this one trick!
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This guy makes his shared examples easier to understand. Overpaid consultants hate him!

When to use let, let! and before in RSpec
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When to use let, let! and before in RSpec.