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resource :report do
  resources :subjects, only: :index
end

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def authenticate
  if params[:username].present? && params[:password].present?
    inn = Inn.find_by(username: params[:username])
    
    if inn
      authenticated = inn.authenticate(params[:password])
      
      if authenticated
        redirect_to inns_url, notice: 'You are now logged in.'
        return

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# app/drops/invoice_drop.rb

class InvoiceDrop < Liquid::Drop
  delegate :days_late, :priceinbtw, :print_date, :id, :late, :unpayed, to: :invoice

  attr_reader :invoice

  def initialize(invoice)
    @invoice = invoice
  end

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class State < ActiveRecord::Base
  def self.default
    find_by(default: true)
  end

  def make_default!
    PgLock.new(name: 'set_state_default').lock do
      State.update_all(default: false)
      update(default: true)
    end

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class ApplicationController < ActionController::Base
  ...
  ...
  include DeviseCustomParams
end

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Started PATCH "/users/28/edit" for 192.168.0.100 at 2016-09-23 22:40:26 +0200
Processing by UsersController#edit as HTML
  Parameters: {"utf8"=>"✓", "authenticity_token"=>"BILLq+y8oXYL6aECCZCPONCAalsaKMYfZWFB50J3kNRQCSdt1Fy+X17fExIXML0bi5p00mH07lXXJNKOecytjA==", "user"=>{"name"=>"Name Update", "email"=>"[email protected]", "password"=>"[FILTERED]", "password_confirmation"=>"[FILTERED]"}, "button"=>"", "id"=>"28"}
  User Load (0.2ms)  SELECT  "users".* FROM "users" WHERE "users"."id" = $1 LIMIT $2  [["id", 28], ["LIMIT", 1]]
  Rendering users/edit.html.erb within layouts/application
  Rendered shared/_errors.html.erb (0.4ms)
  Rendered users/edit.html.erb within layouts/application (3.6ms)
  Rendered application/_favicon.html.erb (8.4ms)
  User Load (0.4ms)  SELECT  "users".* FROM "users" WHERE "users"."id" = $1 ORDER BY "users"."id" ASC LIMIT $2  [["id", 28], ["LIMIT", 1]]
  Rendered layouts/_header.html.erb (3.6ms)

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validate :relation_with_same_tenant

.......

private

def relation_with_same_tenant
  if self.shop_id!=ui_listable.shop_id
    self.errors.add(:ui_listable,"ERROR MESSAGE")

tbuehlmann

class CreateReleaseSteps < ActiveRecord::Migration[5.0]
  def change
    create_table :release_steps do |t|
      t.belongs_to :release, index: true
      t.string :name
      t.string :loadbalancer
      t.string :comment
      t.integer :release_id
    end
  end

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class AddPriceToLineItem < ActiveRecord::Migration[5.0]
  def change
    add_column :line_items, :price, :decimal
    
    LineItem.includes(:product).find_each do |li|
      li.update(price: li.product.price)
    end
  end
end

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class BooksController < ApplicationController
  def index
    @books = Book.all
  end

  def search
    @books = Book.all
    
    if params[:price].present?
      @books = @books.where('price <= ?', params[:price])