The reserved Ruby key word yield is for processing closures (like a Proc or lamda). That said it is some kind of placeholder for processing some logic. In Ruby on Rails view templating it is used for merging in partials. In the case of a layout file like the application.html.erb it merges in controller response … Read more
I figured out the reason for ArgumentError: uncaught throw “Error in record 314675: undefined method ‘[]’ for nil:NilClass’ was primarily from an incomplete set of input variables that is required by the def init method. Because this was an ArgumentError that was thrown from the function1 method, I was only invested in debugging function1. The … Read more
Add uniqueness validation on Cart.product_id, scoping by Cart.id: class Cart < ApplicationRecord validates :product_id, uniqueness: {scope: :id} end But beware of race conditions. UPDATE: If no actual Cart model add validation to LineItem: class LineItem < ApplicationRecord validates :product_id, uniqueness: {scope: :order_id} end UPDATE 2: refactor add method with find_or_initialize_by: def add @cart.save if @cart.new_record? … Read more
One example would be errors when they are encountered. e.g. in validation errors[:base] << “Value must be an integer.” solved When should you use an empty array in a web application? [closed]
I have a feeling you are looping in the view with something like <%= posts.each do |post| %> if you remove the = such as <% posts.each do |post| %> the data will no longer be displayed. In very simplified terms: <%= means display this data. each will return the original object so you are … Read more
What do you think of the above expression for email validation. For one, it doesn’t accept my address. So, there’s obviously a bug in there somewhere. I suggest you read RfC5322 carefully, it describes the valid syntax for addresses quite clearly, although unfortunately it hasn’t yet been updated for IDN. solved Email Regex. Is this … Read more
You could write a custom validator function: For example(assumption, you have a followed_users method which returns all the users that the current user is following, and a follow method, taking a user id and “following this user.): class User < ActiveRecord::Base has_many :users, inverse_of :user, as: followed_users validates :verify_no_circular_followers def followed followed_users end def follow(user_id) … Read more
Each time you add an object to s3, a single individual object like one file that counts as a single request So if you drag and drop 100 files it is 100 requests If runs a loop and individually sends 100 files it is 100 requests All this activity will be shown in the billing … Read more
Use the rest-client gem.You can make HTTP request from your controller using this. Their github page has examples explaining how to make reuqest along with paramters. A simple get request may look like this: RestClient.get ‘”https://graph.facebook.com’, {params: {‘scrape’=> true, ‘access_token’ => ‘your_access_token’}} solved Convert or Execute an CURL Request for Rails Application
Add //= require_self to application.js this includes its own file contents too. This has to be done explicitly. also keep the application.js formatted //= require jquery //= require jquery_ujs //= require bootstrap //= require bootstrap-datepicker //= require picker //= require_tree . //= require_self $(function() { $(‘#dp5’).datepicker() }); // Do not keep bank spaces between included … Read more
What you need is hash and not string. You can use it like this, hash = {id: 2} User.where(hash) And if you really want to use string you can do it like this, string = “id = 2” User.where(string) If you want to execute the string you can use eval. In that case it will … Read more
Probably libmysqlclient is not installed in your system. Install it by using this command: sudo apt-get install libmysqlclient-dev Cheers! solved Getting errors when running Rails server with MySQL
class User belongs_to :lives, class_name: ‘Loca’, foreign_key: ‘lives_location’ belongs_to :works, class_name: ‘Loca’, foreign_key: ‘works_location’ … end class Loca has_many :users … end 1 solved Ruby on Rails having more than 1 different column foreign keyed to same table
Python: print (“{0:5s} {1:7s} {2:9s} {3:6s} {4:25s} {5:s}”.format(‘Rank’, ‘Points’, ‘Comments’, ‘Hours’, ‘Sub’, ‘Link’)) Ruby: puts “%-5s %-7s %-9s %-6s %-25s %-5s” % [‘Rank’, ‘Points’, ‘Comments’, ‘Hours’, ‘Sub’, ‘Link’] Alternatively: puts sprintf(“%-5s %-7s %-9s %-6s %-25s %-5s”, *[‘Rank’, ‘Points’, ‘Comments’, ‘Hours’, ‘Sub’, ‘Link’]) 1 solved What would the ruby equivalent be to this python script?
edit_user_registration_path is not for forgot password path See Devise shared link You could include this link into your login form <%= link_to “Forgot your password?”, new_password_path(resource_name) %> 5 solved Send Password for devise in Ruby on Rails