samokoder

# Here's a contrived example of a LEFT JOIN using ARel. This is an example of
# the mechanics, not a real-world use case.

# NOTE: In the gist comments, @ozydingo linked their general-purpose ActiveRecord
# extension that works for any named association. That's what I really wanted!
# Go use that! Go: https://gist.github.com/ozydingo/70de96ad57ab69003446

# == DEFINITIONS
# - A Taxi is a car for hire. A taxi has_many :passengers.
# - A Passenger records one person riding in one taxi one time. It belongs_to :taxi.

samokoder

module ActiveRecordExtension
  extend ActiveSupport::Concern

  module ClassMethods
    # Simple left join taking advantage of existing Rails & Arel code
    def left_joins(*args)
      inner_joins = self.joins(*args).arel.join_sources
      left_joins = inner_joins.map do |join|
        Arel::Nodes::OuterJoin.new(join.left, join.right)
      end

samokoder

// api.js
export const getTasks() {
  return get('/api/tasks')
    .then(resp => new Promise(resolve => {
      const { headers } = resp;
      return resp.json()
        .then(body => resolve({ body, headers }));
    }));
};