Tag: ruby-on-rails,ruby,regex,validation
How can I validate :title in my model so that only the letters a-z, A-z, and 0-9 are accepted?
validates :title, :format => { with: REGULAR EXPRESSION , :message => 'no special characters, only letters and numbers' }
What should the regular expression be?
The regular expression would be /^[a-zA-Z0-9]*$/
You basically define three ranges of symbols that are allowed, first a-z, then A-Z and finally 0-9.
The asterisk in the end then defines that zero or more of the previously stated characters need to be matched, that means that an empty title would be allowed. If you want at least one character, use a + instead of the *. Or if you want more than three characters, use {3,} instead of the asterisk.
jquery,ruby-on-rails,search,if-statement
The standard way to use a search would be to include a parameter in the URL. That way you can have a similar to if user_signed_in? check for the parameter: if params[:search].present?.
ruby-on-rails,ruby,rest,activerecord,one-to-many
Take a look at merit gem. Even if you want to develop your own badge system from scratch this gem contains plenty of nice solutions you can use. https://github.com/merit-gem/merit
ruby-on-rails,ruby,ruby-on-rails-4,model-view-controller
You can use content_for and yields to create a default in your layout which views can override. # layouts/application.html.erb: <% if content_for?(:banner) %> <%= yield(:banner) %> <% else %> <div id="banner"> <h1>This is the default...</h1> </div> <% end %> /users/signup.html.erb: <%- content_for :banner, flush: true do -%> <!-- move along,...
ruby-on-rails,arrays,ruby,multidimensional-array
dup does not create a deep copy, it copies only the outermost object. From that docs: Produces a shallow copy of obj—the instance variables of obj are copied, but not the objects they reference. dup copies the tainted state of obj. If you are not sure how deep your object...
Your column should be permission_id, not permissions_id. That is why AR doesn't find the related model.
Because there is no need for other ways. Under the hood it's all the same: when you define a UNIQUE constraint, a UNIQUE index is created on that table to enforce it. Question from DBA.SE: When should I use a unique constraint instead of a unique index? So for a...
ruby-on-rails,ruby,ruby-on-rails-4,twitter
If you express the relation properly, ActiveRecord will do it for you class Tweet belongs_to :original_tweet, class_name: Tweet has_many :retweets, class_name: Tweet, dependent: :destroy, inverse_of :original_tweet end Tweet.last.destroy # will now destroy dependents ...
Since you need to support both (POST /milestones and POST /projects/:project_id/milestones) the project_id to the form: <%= form_for [@project,Milestone.new] do |f| %> ... <%= f.hidden_field(:project_id, value: @project_id) %> ... <%- end -%> Or if your resource is always nested than project_id available in the params in your controller so you...
ruby-on-rails,ruby-on-rails-4,mongoid,embedded-documents
The reason you are getting the error is because of the logic below. If you are going to need to represent many-to-many relations, do not use a document model to store your state. Use a relational one === You can't represent a many to many relation without an association/reference table/object....
ruby-on-rails,ruby,ruby-on-rails-4
You should pass actions to the included block and perform_search_on to the class_methods block. module Searchable extend ActiveSupport::Concern class_methods do def perform_search_on(klass, associations = {}) ............. end end included do def filter respond_to do |format| format.json { render 'api/search/filters.json' } end end end end When your Searchable module include a...
As I said, you need to tweak your create action like this in order to save group_id. def create @group = Group.find(params[:group_id]) @discussion = current_user.discussions.build(discussion_params) @discussion.group_id = @group.id if @discussion.save flash[:success] = "Discussion started." redirect_to root_url end end OR You can add a hidden_field in your form_for to save group_id...
Add the following to your Polls Controller- def new @poll = Poll.new 4.times do @poll.answers.build end end ...
ruby-on-rails,ruby,authentication
@user.keys.each do |key| username == key.api_id && password == key.api_key end This piece of code returns a value of .each, which is the collection it's called on (@user.keys in this case). As it is a truthy value, the check will pass always, regardless of what are the results of evaluating...
ruby-on-rails,ruby,ruby-on-rails-4,activerecord
It's not "through Hash", it's "array access" operator. To implement it, you need to define methods: def [](*keys) # Define here end def []=(*keys, value) # Define here end Of course, if you won't be using multiple keys to access an element, you're fine with using just key instead of...
collection_select internally relies on options_from_collection_for_select helper. Rather than using the collection_select directly, you can use select and pass the result of a options_from_collection_for_select call. The reason you may want to call options_from_collection_for_select directly, is because this method also accepts an optional selected parameter that could be used to pass a...
Your migration file named should correspond to AddWeightToExercises. It should be accordingly xxxxxxxx_add_weight_to_exercises, where xxxxxxx corresponds to a particular timestamp.
ruby-on-rails,activerecord,callback
It'll work without any issue, as Active Record wraps-up these callback methods in a single transaction. Since the object is destroyed in first yield, it seems the later is not feasible (assuming everything is running in one thread). How Rails handles this? No, object isn't destroyed in first yield. Object...
Yes, this bookkeeping with i is usually a sign there should be something better. I came up with: ar =[ { name: "foo1", location: "new york" }, { name: "foo2", location: "new york" }, { name: "foo3", location: "new york" }, { name: "bar1", location: "new york" }, { name:...
ruby-on-rails,ruby,ruby-on-rails-4,ruby-on-rails-3.2
So, the complex part of your situation is that you have one thing (Surgery) that can be of many different types, and the different types have different fields. There are a number of different approaches to this problem, and I don't believe there's wide consensus on the 'best way'. The...
Here is a way using an intermediate hash-of-hash The h ends up looking like this {"Alaska"=>{"Rain"=>"3", "Snow"=>"4"}, "Alabama"=>{"Snow"=>"2", "Hail"=>"1"}} myArray = [["Alaska","Rain","3"],["Alaska","Snow","4"],["Alabama","Snow","2"],["Alabama","Hail","1"]] myFields = ["Snow","Rain","Hail"] h = Hash.new{|h, k| h[k] = {}} myArray.each{|i, j, k| h[i][j] = k } p [["State"] + myFields] + h.map{|k, v| [k] + v.values_at(*myFields)} output...
Maybe it makes extract the planet as another model? def Planet enum type: %w(earth mars jupiter) end class PlanetEdge < ActiveRecord::Base belongs_to :first_planet, class_name: 'Planet' belongs_to :second_planet, class_name: 'Planet' end You can create a PlanetEdge by using accepts_nested_attributes_for: class PlanetEdge < ActiveRecord::Base belongs_to :first_planet, class_name: 'Planet' belongs_to :second_planet, class_name: 'Planet'...
javascript,jquery,ruby-on-rails
This is a result of Turbolinks. You can get around this with the following: $(document).on 'click', '.my-btn', (event) -> ... This is happening because Turbolinks is loading the page, and there isn't a document ready event being fired. You want to wait until Turbolinks fires the page:load event. You do...
[a, b, c].count(true) < 2 ........................
Change if to while: while ["user_4", "user_5"].include?(@randUser = @redis.spop("users")) do @redis.sadd("users", @randUser) end $user_username = @redis.hget(@randUser, "username") $user_password = @redis.hget(@randUser, "password") Please note, that you actually mixed up receiver and parameters on Array#include?...
You need to change the delivery_method from :smtp to :sendmail config.action_mailer.delivery_method = :sendmail ...
Normally we'd use a loop do with a guard clause: x = 1 loop do break if x >= y x += 1 ... end Make sure y is larger than x or it'll never do anything. y can change if necessary and as long as it's greater than x...
ruby-on-rails,ruby,rack,multipart
Telling it short, this value limits the amount of simultaneously opened files for multipart requests. To understand better what is multipart, you can see this question. The reason for this limitation is an ability to better adjust your app for your server. If you have too many files opened at...
I would do: def get_days(wkn, *desired_days) get_week = Model.week(2) get_days_of_week = get_week.select { |x| desired_days.include? x.strftime("%A") } end ...
According to the docs https://github.com/rails/strong_parameters#permitted-scalar-values: The permitted scalar types are String, Symbol, NilClass, Numeric, TrueClass, FalseClass, Date, Time, DateTime, StringIO, IO, ActionDispatch::Http::UploadedFile and Rack::Test::UploadedFile. To declare that the value in params must be an array of permitted scalar values map the key to an empty array: params.permit(:id => []) If...
As you can see from logs, you got error page because of line 78 of app/views/shared/_header.html.erb file. In this piece of code, where you creating link <%= link_to "My Account", edit_company_path(current_user.company_id) %> Check if company_id is not nil for that particular user. I'm pretty sure it's nil in your case....
ruby-on-rails,railstutorial.org,minitest,guard
2 tests, 2 assumptions, 0 failures, 0 errors, 0 skips means guard successfully ran 2 tests containing two assumptions (assertions). The messages in the debug log are telling you of missing dependencies. You could save yourself a big headache and use the free cloud 9 and heroku setup Hartl suggests,...
Try to use css instead of xpath, this will work for you, doc = Nokogiri::XML(response.body) values = doc.css('Name').select{|name| name.text}.join',' puts values => Ram,Sam ...
What you are doing will access the fourth character of String s. Split the string to an array and then access the fourth element as follows. puts s.split[3] Note: Calling split without parameters separates the string by whitespace. Edit: Fixing indexes. The index starts from 0. That means s.split[3] will...
Short answer: no, you cant. 2.1.5 :001 > 0001 => 1 0001 doesn't make sense at all as Integer. In the Integer world, 0001 is exactly as 1. Moreover, the number of leading integer is generally irrelevant, unless you need to pad some integer for displaying, but in this case...
ruby-on-rails,ruby,ruby-on-rails-3,memory,heroku
That log excert is from a one off dyno, a la heroku run console - this is entirely seperate to your web dynos which you may be runnning 2x dyno's for. You need to specifiy --size=2x in your heroku run command to have the one off process use 2x dynos.
ruby,page-object-gem,rspec3,rspec-expectations
The Page-Object gem's attribute method does not do any formatting of the attribute value. It simply returns what is returned from Selenium-WebDriver (or Watir-Webdriver). In the case of boolean attributes, this means that true or false will be returned. From the Selenium-WebDriver#attribute documentation: The following are deemed to be “boolean”...
If you're using Rails 4 you can do: @user = User.find_by(first_name: "John", last_name: "Doe") If rails 3: @user = User.find_by_first_name_and_last_name("John", "Doe")...