grape

https://github.com/intridea/grape

Ruby

An opinionated framework for creating REST-like APIs in Ruby.

Gitlab::Database::MigrationHelpers#add_concurrent_foreign_key

Adds a foreign key with only minimal locking on the tables involved.

This method only requires minimal locking when using PostgreSQL. When
using MySQL this method will use Rails' default `add_foreign_key`.

source - The source table containing the foreign key.
target - The target table the key points to.
column - The name of the column to create the foreign key on.
on_delete - The action to perform when associated data is removed,
            defaults to "CASCADE".

Source | Google | Stack overflow

Edit

git clone [email protected]:intridea/grape.git
cd grape
open

Contribute

# Make a new branch

git checkout -b -your-name--update-docs-Gitlab--Database--MigrationHelpers-add_concurrent_foreign_key-for-pr

# Commit to git

git add git commit -m "better docs for Gitlab::Database::MigrationHelpers#add_concurrent_foreign_key"

# Open pull request

gem install hub # on a mac you can `brew install hub`

hub fork

git push <your name> -your-name--update-docs-Gitlab--Database--MigrationHelpers-add_concurrent_foreign_key-for-pr

hub pull-request

# Celebrate!