akshaymohite

Advanced JavaScript Learning Resources

This is a list of advanced JavaScript learning resources from people who responded to this [Tweet][13] and this [Tweet][20].

• [You Don't Know JS][3]

• [Frontend Masters courses by Kyle Simpson][12]

• [@mpjme][6]'s [YouTube videos][5]

akshaymohite

# Set up a param sanitizer to filter parameters using strong_parameters. See
# lib/devise/parameter_sanitizer.rb for more info. Override this
# method in your application controller to use your own parameter sanitizer.
def devise_parameter_sanitizer
  @devise_parameter_sanitizer ||= Devise::ParameterSanitizer.new(resource_class, resource_name, params)
end

akshaymohite

1) see re: increasing shmmax http://stackoverflow.com/a/10629164/1283020

2) add to postgresql.conf:
shared_preload_libraries = 'pg_stat_statements'   # (change requires restart)
136 pg_stat_statements.max = 1000
137 pg_stat_statements.track = all

3) restart postgres

4) check it out in psql

akshaymohite

user = User.create!(name: 'Akshay')
user.image.attach(io: File.open(Rails.root.join("public", "nature.jpeg")), filename: 'nature.jpg' , content_type: "image/jpg")

#(0.2ms)  BEGIN
#  SQL (0.4ms)  INSERT INTO "active_storage_blobs" ("key", "filename", "content_type", "byte_size", "checksum", "created_at") VALUES ($1, $2, $3, $4, $5, $6) RETURNING "id"  [["key", "jd7L8dydnt11tXpsWWX9AXbw"], ["filename", "nature.jpg"], ["content_type", "image/jpg"], ["byte_size", 10055], ["checksum", "A5p01Zn3Rq3lG1gU8eji0w=="], ["created_at", "12:17:47.164687"]]
#   (1.0ms)  COMMIT
#   (0.1ms)  BEGIN
#  SQL (0.3ms)  INSERT INTO "active_storage_attachments" ("name", "record_gid", "blob_id", "created_at") VALUES ($1, $2, $3, $4) RETURNING "id"  [["name", "image"], ["record_gid", "gid://activestorage-demo/User/1"], ["blob_id", 2], ["created_at", "12:17:47.168074"]]
#   (0.3ms)  COMMIT

akshaymohite

➜  activestorage-demo git:(master) ✗ rails console
(erb):11:in `<main>': Cannot load `Rails.config.active_storage.service`:
undefined method `[]' for nil:NilClass (NoMethodError)
	from /Users/akshay/.rvm/rubies/ruby-2.4.0/lib/ruby/2.4.0/erb.rb:896:in `eval'
	from /Users/akshay/.rvm/rubies/ruby-2.4.0/lib/ruby/2.4.0/erb.rb:896:in `result'
	from /Users/akshay/.rvm/gems/ruby-2.4.0/gems/activestorage-0.1/lib/active_storage/railtie.rb:37:in `block in <class:Engine>'
	from /Users/akshay/.rvm/gems/ruby-2.4.0/gems/activesupport-5.1.2/lib/active_support/lazy_load_hooks.rb:43:in `execute_hook'

akshaymohite

test:
  service: Disk
  root: <%= Rails.root.join("tmp/storage") %>

local:
  service: Disk
  root: <%= Rails.root.join("storage") %>

amazon:
  service: S3

akshaymohite

class ActiveStorage::CreateTables < ActiveRecord::Migration[5.1]
  def change
    create_table :active_storage_blobs do |t|
      t.string  :key
      t.string  :filename
      t.string  :content_type
      t.text    :metadata
      t.integer :byte_size
      t.string  :checksum
      t.time    :created_at

akshaymohite

default: &default
  adapter: postgresql
  pool: <%= ENV.fetch("RAILS_MAX_THREADS") { 5 } %>
  timeout: 5000

development:
  <<: *default
  database: activestorage-demo-development

test:

akshaymohite

class User < ApplicationRecord
  has_one_attached :image
end

akshaymohite

class CreateUsers < ActiveRecord::Migration[5.1]
  def change
    create_table :users do |t|
      t.string :name
      t.file :image
      t.timestamps
    end
  end
end