DEV Community: disanchez27edu

Creating Records with Associations

disanchez27edu — Mon, 16 Jan 2023 19:35:51 +0000

To create my sample data, I simply created a new set of records for each table. I included logic so that the entities that had any kind of association would be assigned a user through the necessary foreign_key.

 ## SAMPLE PHOTOS ###

  p "Creating sample photos"

  100.times do
    new_photo = Photo.create(
     owner_id: User.all.sample.id,
     caption:  Faker::Hipster.sentence(word_count: 10),
     image:   "http://www.robohash.org/"+Faker::Number.number(digits: 4).to_s
    )
  end

  p "#{Photo.count} photos created."
  p "Here's an example:"
  p Photo.all.order(id: :desc).first

Yet in my database, those associations are not understood. Why is this?

Methods, Symbols, Strings Pt 2

disanchez27edu — Fri, 13 Jan 2023 19:09:01 +0000

In building out a data model for users in a hypothetical "photogram" web app, the syntax is quite tricky!
Why, in the code below, do we use symbols, strings, and methods at different points?

class User < ApplicationRecord
  # Include default devise modules. Others available are:
  # :confirmable, :lockable, :timeoutable, :trackable and :omniauthable
  devise :database_authenticatable, :registerable,
         :recoverable, :rememberable, :validatable

  has_many :own_photos, class_name: "Photo", foreign_key: "owner_id"
  has_many :comments, class_name: "Comment", foreign_key: "author_id"
  has_many :follow_requests_received, class_name: "FollowRequest", foreign_key: "recipient_id"
  has_many :follow_requests_sent, class_name: "FollowRequest", foreign_key: "sender_id"
  has_many :likes, class_name: "Like", foreign_key: "fan_id"
end

Methods, Symbols, and strings

disanchez27edu — Sat, 07 Jan 2023 18:40:34 +0000

What is the difference? How do I know when to call one vs the other? Ex case:

In reformatting:

matching_movies = Movie.all @list_of_movies = matching_movies.order( created_at: desc )

to:

matching_movies = Movie.all.order( created_at: :desc )

what is the class of :desc? Why did we use it?

Refactoring Routes

disanchez27edu — Fri, 06 Jan 2023 22:11:02 +0000

Key learning:

Routes can be refactored quite simply! for example, the route

get ("/", ({ :controller => "controller_name", :action => "action_name"})

can be simplified to

root "controller_name#action_name"

Fundamentally, this works because the entire argument is just the method being applied to the hash relationship between the controller and the action.

Root is a specific method that works for the index file.