I'm using rails 3.1.3
I was trying to make a nested form - I made it work in the end, so I've got all the accepts_nested_attributes_for bits right.
This is the form that worked:
<%= form_for(#article, :as => :article) do |f| %>
......some article fields in here
<%= f.fields_for :article_site_permissions do |builder| %>
<%= builder.label :name %><br />
<%= builder.text_field :name %>
<% end %>
<div class="actions">
<%= f.submit 'Update' %>
</div>
<% end %>
The weird bit is that the line <%= f.fields_for :article_site_permissions do |builder| %> needed <%= not <%. All the examples I've seen (eg http://railscasts.com/episodes/196-nested-model-form-part-1?view=asciicast) can use <% not <%=. Coincidently, later that day the same thing happened on a colleagues project, which prompted this question.
Does anyone know what's going on here?
From rails 3.0 onwards <%= is the right thing to do (see the release notes). The railscast you link to predates rails 3.0.
Related
I keep getting the following syntax error in my index.html.erb file. I'm using Ruby 2.1.2. and Sinatra 1.4.5. Any comments are appreciated.
syntax error, unexpected ')' #_out_buf = ''; #_out_buf.concat(( form_for(#user) do |f| ).to_s)
<%= form_for(#user) do |f| %>
<div class="field">
<%= f.label :email %><br />
<%= f.text_field :email %>
</div>
<div class="actions"><%= f.submit "Sign Up"%></div>
<% end %>
When opening a block in an ERB template like you do with your form_for call, you can't use the <%= tag here. While this is required in Rails, it is only because they patch ERB in a rather horribly way to implement this.
If you do not use Rails, you have to use this:
<% form_for(#user) do |f| %>
<%# ... %>
<% end %>
Finally, unless you use an external library to implement this, note that form_for is not available in standard Sinatra.
pls can someone explain how I can dynamically add another copy of a form in rails?...been working on this for almost 2hrs. I messed around with .clone() and .appendTo in jquery, but it didnt work. Also, most of the materials I found online (like on railscast #196 and stackoverflow) focused heavily on nested forms. My form is nested, but I actually just want to add the parent form again. The photos which are nested use the html multiple attributes so I'm guessing that will handle multiple files upload for each parent form (btw I'm using paperclip).
If I just need to modify the railscast code please let me know.
Thanks.
<%= form_for(#user_book, html: { multipart: true }) do |f| %>
<% if #user_book.errors.any? %>
<div id="error_explanation">
<h2><%= pluralize(#user_book.errors.count, "error") %> prohibited this user_book from been saved:</h2>
<ul>
<% #user_book.errors.full_messages.each do |msg| %>
<li><%= msg %></li>
<p>hello</p>
<% end %>
</ul>
</div>
<% end %>
<%= f.text_field :title, placeholder: "enter title...", id: "book_title" %>
<%= f.text_field :category, placeholder: "enter category..." %>
<%= file_field_tag 'user_book[user_book_photos_attributes][][photo]', :multiple => true do |p| %>
<%= p.file_field :photo %>
<% end %>
<div class="actions">
<%= f.submit %>
</div>
<% end %>
I am just using the standard Facebooker2 setup.
<%= fb_connect_async_js %>
<% if current_facebook_user %>
<%= "Hello #{fb_name(current_facebook_user, :useyou => false)}!" %>
<%= fb_logout_link("Logout", request.url) %><br />
<% else %>
<%= fb_login_and_redirect('/login', :scope => 'user_about_me') %>
<% end %>
What displays on the page is:
Hello <fb:name uid="73648576" useyou="false"></fb:name>
I am sure there's something very basic wrong here, but I've followed the instructions, done tutorials, wetc. and continue to get this result.
Any help most appreciated!
Not sure why fb_name isn't working, but you could use the other method as specified in the readme. In this case, you need to call the fetch method on current_facebook_user first:
<% if current_facebook_user %>
<% current_facebook_user.fetch %>
<%= "Welcome #{current_facebook_user.first_name} #{current_facebook_user.last_name}!" %>
Ref: http://www.engineyard.com/video/21045039 (around 9:36)
I'm following along with the Rails Guides - Getting Started tutorial. It makes a basic Post model, and a Comment model that belongs to Post.
I have added a simple validation to the Comment model, and it works, but I can't figure out how to get form errors to display if I fill it out wrong.
Here is my comment.rb model
class Comment < ActiveRecord::Base
validates :body, presence: true
belongs_to :post
end
Here is the original form for adding a comment, it's in posts/show.html.erb
<h2>Add a comment:</h2>
<%= form_for([#post, #post.comments.build]) do |f| %>
<div class="field">
<%= f.label :commenter %><br />
<%= f.text_field :commenter %>
</div>
<div class="field">
<%= f.label :body %><br />
<%= f.text_area :body %>
</div>
<div class="actions">
<%= f.submit %>
</div>
<% end %>
And the original create action in comments_controller.rb
class CommentsController < ApplicationController
def create
#post = Post.find(params[:post_id])
#comment = #post.comments.create(params[:comment])
redirect_to post_path(#post)
end
end
I've tried quite a few things, but it all feels like fumbling around in the dark. Can someone point me in the right direction please?
Take a look at the dynamic_form gem - this used to be part of Rail itself but was extracted a while back. With it, you can display errors inline like this:
<%= f.label :commenter %><br />
<%= f.text_field :commenter %>
<%= f.error_message_on :commenter %>
I'm very new to Rails 3 and I've followed some tutorials and now I'm trying to "play" with the code created. I have followed the tutorial from http://guides.rubyonrails.org/getting_started.html
I'm am trying to render the form for new posts on the homepage with this code:
<%= render :partial => "posts/form" %>
The posts/_form.html.erb looks like this:
<%= form_for(#post) do |f| %>
<% if #post.errors.any? %>
<div id="error_explanation">
<h2><%= pluralize(#post.errors.count, "error") %> prohibited this post from being saved:</h2>
<ul>
<% #post.errors.full_messages.each do |msg| %>
<li><%= msg %></li>
<% end %>
</ul>
</div>
<% end %>
<div class="field">
<%= f.label :name %><br />
<%= f.text_field :name %>
</div>
<div class="field">
<%= f.label :title %><br />
<%= f.text_field :title %>
</div>
<div class="field">
<%= f.label :content %><br />
<%= f.text_area :content %>
</div>
<div class="actions">
<%= f.submit %>
</div>
<% end %>
and this is the error I get:
undefined method `model_name' for NilClass:Class
Extracted source (around line #1):
1: <%= form_for(#post) do |f| %>
2: <% if #post.errors.any? %>
3: <div id="error_explanation">
4: <h2><%= pluralize(#post.errors.count, "error") %> prohibited this post from being saved:</h2>
Trace of template inclusion: app/views/home/index.html.erb
Rails.root: d:/server/cazare
Application Trace | Framework Trace | Full Trace
app/views/posts/_form.html.erb:1:in `_app_views_posts__form_html_erb___794893824_70478136_519766'
app/views/home/index.html.erb:5:in `_app_views_home_index_html_erb__967672939_70487520_0'
I understand that this may seem a piece of cake for some of you but I'm trying to understand how everything works on Rails so I hope you can understand me.
Thanks in advance !
#post variable is not instantiated in the Controller :)
so "#post = Post.new" inside the controller action should do the trick
Rails is attempting to build a form for the object #post. In order to do that, it needs to know what sort of object #post is; that way, it can find any existing data in the object and fill it into the form for you. Rails has a method grafted on to objects called model_name to do the lookup, but it won't be grafted onto NilClass (the class of the nil object).
I suspect that you haven't defined #post anywhere - it's an instance variable of the Controller, so you'd expect the controller to either find #post from the database, or to call #post = Post.new - so it's nil.
In the posts/_form.html.erb,
change
<%= form_for(#post) do |f| %>
to
<%= form_for(Post.new) do |f| %>