Comment on Complex Rails Forms with Nested Attributes by Brad

Try Ryan’s updated RailsCast on NestedAttributes, which does exactly that (create a multiple choice quiz): http://railscasts.com/episodes/196-neste d-model-form-revised (highly worth paying the $9), or if you want to watch the older one, which should mostly work on Rails 3.x, you can try: http://railscasts.com/episodes/196-neste d-model-fo...

Rails 3.2 has_many through form submission

I have a has_many :through form where I can't get an extra attribute to post to the database. I'm fouling up the parameter name somewhere. I can get the foreign keys to post but I have another attribute that I'm trying to track in the join table. Keep in mind this is a 100% ajax based form. Here's what I know Edit: After researching simil...

How to validate existing invalid model via nested attributes?

It seems Rails will only validate an existing invalid nested model if the nested model's attributes have changed. With the following models: class Person < ActiveRecord::Base has_many :addresses accepts_nested_attributes_for :addresses class Address < ActiveRecord::Base belongs_to :person validates_presence_of :street The fo...

Filter a map with complex nested structure

What would be a best way to impose a condition on the nested fields of complex nested structure like... :aa {:a "a_val",:b "b_val"}, :qq {:abc { :x1 {:x "abc",:u "ee"}, :x2 {:y "abc",:i "ee"}, :x3 {:x "abc",:i "ee"} } }, :ww {:xyz { :y1 {:x "abc",:u "ee"}, :y2 {:y "abc",:i "0"}, :y3 {:x "abc",:i "ee"} } } I want to check wh...

Getting "complex-functions.cpp:57:25: error: expected initializer before ‘add’" What does it mean?

I have a class declared like this in a header file : class COMPLEX{ private: typedef struct{ double real; double imaginary; }complex; Now when I call this from the function driver I get that error "expected initalizer before add right here in this section of code, and as you can see I have it just li...

Rails 3 complex form with nested attributes

I have single form where i have vehicle details, complaint details and user details .Where vehicle has_many complaints and user has_many complaints .Its a nested_attribute form but for some reason i feel the association is wrong and im little confused how the form should be Or It should be complaint has_one vehicle and complaint has_one u...

Mass Assignment in nested form

I am following railscasts 196 episode and i try exactly what he has, but i am having the following error ActiveModel::MassAssignmentSecurity::Err or in SurveysController#create Can't mass-assign protected attributes: questions_attributes Rails.root: /home/jean/rail/surveysays Here my code so far Survey Form <%= form_for(@survey) do |f|...

Rails 3 level deep nested resources

I know many rails developers say that nesting your resources more then 2 levels deep is wrongdoing. I also agree because it gets messy when your urls looks like mysite.com/account/1/people/1/notes/1. I am trying to find a way to use nested resources but without nesting them 3 levels deep. This is the wrong way of doing it since rails deve...

Rails assign two attributes with one form item

I have an object with attributes first_team_name and second_team_name , and a list that has pairs of [team1, team2] values. I would like to be able to have it so when I select an object in the form, it assigns team1 to first_team_name and team2 to second_team_name , but I have no idea how to split those values accordingly. Is there a...

Rails - How Do I Nest Comments - Polymorphism

For my application, I have Projects. I have used Polymorphism to build a model called "Newcomment" for comments made on these Projects. I followed this railscast . This works great. But now, I want to build comments on top of comments. I tried following this tutorial ( http://kconrails.com/2010/10/23/nested-c omments-in-ruby-on-rails-1-mod...

PHP Regex to remove nested form elements but not input elements

I'm modifying a PHP script that I have and it is currently outputting a nested form. Something like: <form name="input" action="html_form_action.asp" method="get"> <p>stuff here here, this may or may not be in a div, script, etc..</p> <form name="input" action="html_form_action.asp" method="get"> <div>stuff...

Custom HTML attribute requires a custom helper?

I'm trying to create a form with some custom data attributes on the inputs: This seemed like a nice clean way to have easy front-end access (haha!) with jquery: $("[data-family='Dinosaurs']").doSomethi ng() The problem is I can't get Rails (3.0.3) to render the attribute. <%= f.text_field :question, :id=>"poll_question", :class=>"BigInput"...

Ruby on Rails 2.3 populating and validating non-AR models from form params

I have a ActiveRecord model which contains a serialized field which consists of an Array of a custom non ActiveRecord model (a simple class, with a couple of attributes). I'm trying to figure out a way to integrate population and validation for each of the serialized items together with the parent model but can't find a elegant way for do...

Rails has_many checkboxes with extra attribtues

We have the following code working for a complex rails form with checkboxes. I'm not really happy with the solution we have in place and I was wondering if anyone knows of a more proper way to do this in rails. All the code below is working I just want to know if there is a cleaner approach. In my Admins controller I want to remove the ne...

Nested HTML Tags in Rails

I had a question, re: creating nested html tags in Rails, since I am just learning rails. Basically, I am trying to refactor some code that looks like this: <a id="myid" href="/mylink">MainLinkText<span&g t;Subtext</span></a> However, when I use the contact_tag inside a link_to, I can't get it to display the MainLinkTe...

Symfony2 forward with route parameters

When I do a forward() in a controller, I lose my route and route_parameters. Is there a way to pass them to the forwarded action? EDIT: Found something very strange. When I have ParentAction, that does a forward to ChildAction. In Childaction I do return $this->render('myTemplate.html.twig', array()); then the request attributes get nest...

another mass assignment error for nested form

I've done this 10 times and every time I seem to run into some issue with nested forms. Here's what I have: client controller: def new @client = Client.new @contact = @client.contacts.new @header = "New Client" respond_to do |format| format.html # new.html.erb format.json { render json: @client } end end client class: class Clien...

Ruby on Rails/Haml issues with partials and nested forms

I am creating a nested form and using Ryan Bates Railscast. I am creating a typical form that uses a partial. = form_for(@project, :html => { :class => 'addProjectForm' }) do |f| ... = f.fields_for :crew_members do |crew| #fields = render 'crew_member_fields', :m => crew = link_to_add_fields "Add Crew Members", f, :crew_memb...

Rails shows "WARNING: Can't verify CSRF token authenticity" from a RestKit POST

When I try to POST from RestKit , there is a warning in Rails console: Started POST "/friends" for 127.0.0.1 at 2012-04-16 09:58:10 +0800 Processing by FriendsController#create as */* Parameters: {"friend"=>{"myself_id"=>"m001", "friend_id"=>"f001"}} WARNING: Can't verify CSRF token authenticity (0.1ms) BEGIN SQL (1.7ms) INSERT I...

ostream << overloading crush in class

when i declare ostream << overloading method in my complex number's class ,it crushes suddenly here it is #include<math.h> #include<ostream> #include<iostream> class complex public: double getRe(); double gerIm(); void setRe(double value); void setIm(double value); explicit complex(double=0.0,double=0.0); sta...

Rebind js to dynamically inserted :remote forms in rails

I'm using the standard jquery-rails unobtrusive approach in rails 3.2. It works great if you have a form on the page with :remote => true . But what if you have an ajax action insert a new form on the page. The ajax binding doesn't seem to get reattached. Is there some way to tell rails UJS to "rebind" to all the remote forms on the...

Rails Nested Associations and Scopes

I'm trying to learn arel/scopes in Rails.. I have the following models.. Class Physician has_many :appointments Class Appointment belongs_to :Physician has_many :patients Class Patient belongs_to :appointment # attributes: name I'm trying to find physicians that have patients with the name, say "ron". For this I was thinking of addin...

How to create a nested form for a has_many through association using simple_form and nested form?

I have a rails app that has an album and song model with a has many through relationship. I'm trying to add songs to albums using the simple_form and nested_form gems. If I use simple_form, it's easy to create the association, but I'm having trouble getting it to work with nested_form. It seems that this should work: <%= f.fields_for :s...

Rails: Ajax calls with nested resource form

I have gone the through the JQuery & Ajax Railscast , the only difference in what I am trying to do is that I am using a nested resource. However, the javascript is not working in create.js.erb. I have a link on the 'show' post page to add a new comment, and using ajax render the form partial which resides in my comments views folder: <%=...

Sixth form Help with complex numbers FP2

I have no idea where to start. It states the transformation T from the complex z-plane to the complex w-plane is given by w= (z+1)/(z+i) Show that T maps points on the half line arg(z) = Pi/4 in the z-plane into points on the circle where mod(w) = 1 in teh w-plane. Someone please help...

Undergraduate complex numbers?

can someone please help me with these 3 questions on complex numbers? 1)simplify (express in form a+jb) cos3x+jsin3x/cosx +jsinx 2) if z=2+j/1-j find the real and imaginary parts of the complex number z+1/z 3)if x +y are real solve the equation jx/1+jy = 3x +j4/x +3y any advice would be much appreciated.

Rails: MassAssignmentSecurity::Error

Following the ruby on rails guide developer can't mass-assign protected fields but don't get exception trying to do it, right? But in my case mass-assignment different params through method in rails application: @edition = Edition.new params[:edition] raise following exception: ActiveModel::MassAssignmentSecurity::Err or: Can't mass-ass...

Race conditions in Rails first_or_create

I'm trying to enforce uniqueness of values in one of my table fields. Changing the table isn't an option. I need to use ActiveRecord to conditionally insert a row into the table but I'm concerned about synchronization. Does first_or_create in Rails ActiveRecord prevent race conditions? This is the source code for first_or_create from GitH...

$.each Not Working other than fire fox 3.6

I have a json as below {"DataList": {"Data":[ {"@attributes":{"description":"FGFGFGH", "code":"FGFGFGH"}}, {"@attributes":{"description":"UIS default relying party","code":"UIS"}}, {"@attributes":{"description":"MDEx Healthcare Portal","code":"MDE"}}, {"@attributes":{"description":"VBK","cod e":"VBK"}}, {"@attributes"...

Rails 3: Uniqueness validation for nested fields_for - Part2

I am new to coding - and have not enough reputation to comment this answer: Rails 3: Uniqueness validation for nested fields_for So i am creating this question as "Part 2" :) hey guys pls help me - i am a web designer but curious to learn coding, held with this from my days. # app/validators/nested_attributes_uniquen ess_validator.rb clas...

Using a ViewModel to Expose a Nested Model

I'm looking for a little guidance with a WPF/MVVM app I'm putting together. Google has not helped me today. So I've got an application with some models(domain objects) which have other models as properties. Right now, I just flatten out the nested object, and expose the properties in the containing object's ViewModel. As my models get mor...

Why does Rails validate unchanged attributes?

It seems that validates_uniqueness_of :some_field will run on a "save" even if the some_field attribute has not changed (if other fields have changed). This seems wasteful, since each validates_uniqueness_of will require a database call. I know I can pass a Proc to validates_uniqueness_of to check whether some_field has changed, and I am...

Rails 'uninitialized constant' error for has_many through relationship

I created a has_many :through relationship for a rails app I am creating. However, I am unable have nested attributes for the many to many relationship. My models are as follows: article.rb class Article < ActiveRecord::Base attr_accessible :body, :title has_many :article_tags has_many :tags, :through => :article_tags, :foreign_key =>...

Is it possible to place Rails controller files in app/controllers sub directories?

I'm using Rails 3 and I'd like to move some controller files from app/controllers app/controllers/a-subdirectory . I don't want to namespace those controllers and they don't correspond to nested resources. It is only to have a more organized file structure. When I try to articles_controller app/controllers/a-subdirectory and call a relat...

how do i set Indeterminate state of a checkbox if i have a multiple files that have different attributes values?

I'm trying to create a Properties form for selected items from my small file explorer[ListView] [like in Windows when you right click on some selected files/folders and choose Properties.] the form shows Name,Location,Type,Size and Attributes It's a [WCF service] server client application, so i get the attributes from the server from a me...

rails 3.1 complex find_by_sql query on nested has_many through models

My simplified rails app looks like this # chapter.rb has_many :sections has_many :videos, through: :sections # section.rb belongs_to :chapter has_many :videos # video.rb belongs_to :section has_many :votes # vote.rb belongs_to :video What I want to do is find the top 5 currently popular videos for a given chapter , which would mean orderi...

Rails: form_for routes won't display a good form

i'm new to Rails 3 and am stuck with something i think is simple to solve. I was following the examples from Head First: Rails but came to the conclusion that they are using rails 2. I made an html.erb file like this: <h1>New user</h1> <% form_for(@user, :url=>{:action=>'create'}) do |f| %> <p>Fullname: <...

Sixth form P3 Complex number loci.

Hello,:) Please solve the following... u = (6-3i)/(1+2i) For complex number z satisfying arg(z-u) = pi/4. , find the least value of |z|. ii. For complex numbers satisfying |z-(1+u)| = 1, find the greatest possible value of |z|. Thanks. ...

Symfony2 forms ignores attributes in custom fields when same defined in buidler

When I define attributes in form builder and same attributes as default in custom field the other are ignored. In form builder I have: $builder ->add('validityOfADecisionOnDisabilit y', new JQDateType(), array( 'attr' => array( 'rel' => 'permanent', ) )) and custom field class JQDateType extends AbstractType { public functio...

C#.NET Мнимые и реальные комплексные числа - C# Windows Forms

Здравствуйте! Я извиняюсь, если есть подобная тема, но нужно очень срочно. Комплексное число можно представить через реальную (Re) и мнимую (Im) часть. Разработать функции сложения и вычитания комплексных чисел. Пусть Z1=(Re1, Im1), Z2=(Re2, Im2), тогда: 1) сумма: Z = (Re1+Re2, Im1+Im2); 2) разность: Z = ( Re1-Re2, Im1-Im2).На консоли раб...