lujanfernaud

inherit_from: ../.rubocop.yml

# Checks if uses of quotes match the configured preference.
Style/StringLiterals:
  Enabled: false
  

lujanfernaud

Testing Image Attachments/Uploads in Rails

Model

We need to use File.open(Rails.root.join("<image_path>")).

File.open(Rails.root.join("test/fixtures/files/sample.jpeg"))

lujanfernaud

Rails and Pundit: Custom Redirection When Not Authorized

To use a custom redirection when a resource is not authorized we only need to add an user_not_authorized method to the controller, and define the redirection.

Example:

class Groups::MembershipRequestsController < ApplicationController
  def new
    @membership_request = MembershipRequest.new

lujanfernaud

Running a Rails 5 App in Production Locally

This is what we need to do:

export RAILS_ENV=production
rake db:reset
rake assets:precompile
RAILS_SERVE_STATIC_FILES=true
SECRET_KEY_BASE=production rails s

lujanfernaud

Ruby and Nokogiri: Removing trailing spaces

sample_input = "<div>Hi&nbsp; &nbsp; &nbsp;</div>"
parsed_input = Nokogiri::HTML.parse(sample_input).text #=> "Hi   "

parsed_input.gsub(/\p{Space}*\z/, "") #=> "Hi"

\p{Space} catches any whitespace character.

lujanfernaud

Rails: Migrations

Add reference:

# add_reference :table, :column_name, foreign_key: boolean
add_reference :bookings, :flight, foreign_key: true

Add index:

lujanfernaud

Rails: Random Date in Period

def random_date_in_period(period)
  rand(period).seconds.ago
end

random_date_in_period 1.year #=> Tue, 22 May 2018 04:55:54 UTC +00:00
random_date_in_period 1.year #=> Mon, 06 Nov 2017 19:50:07 UTC +00:00

lujanfernaud

Rails: Order by Priority and Date with Limit for Category

# group.rb

# When we pass NULL to LIMIT, Postgres treats it as LIMIT ALL (no limit).
# https://www.postgresql.org/docs/current/static/sql-select.html#SQL-LIMIT
def topics_prioritized(normal_topics_limit: nil)
  ids = topic_ids(normal_topics_limit)

lujanfernaud

Rails: Dynamic Path Inside Partial

We have a _user partial that we want to render from two different resources, passing a collection. The only thing that needs to change in the partial is the path inside the link_to helper.

We can use self.send("path", object) inside link_to to achieve this.

groups/_user.html.erb

lujanfernaud

Rails: Update Comments Count for All Topics in a Group

def update_topics_comments_count
  begin
    ActiveRecord::Base.connection.execute <<~SQL
      UPDATE topics
         SET comments_count = (SELECT count(1)
                                 FROM topic_comments
                                WHERE topic_comments.topic_id = topics.id