I have _form.html.erb
<%= f.label :name %>
<%= f.text_field :name %>
<%= f.label :password %>
<%= f.password_field :password %>
Now if I render this form in homepage, HTML code should be:
<label for="session_name">Name</label>
<input id="session_name" name="session[name]" size="30" type="text">
...
If I change my _form.html.erb to:
<%= f.label :name %>
<%= f.text_field :name, disabled: true %>
...
HTML code should be:
...
<input disabled="disabled" id="session_name" name="session[name]" size="30" type="text">
...
But, I don't want to change my _form.html.erb, so how can I pass the disabled: true into my form? I tried to use render partial: but don't know syntax.
I just learn Ruby on Rails for 2 weeks, so please help me.
i donno why u wnt to do so but u can solve the prob by this method. Try doing-
in application helper, add method -
def add_disabled
#i suppose that u want the field to be disabled in the users controller for edit action but not for other controllers or actions
return "disabled='disabled'" if params[:controller] == "users" and params[:action] == "edit"
end
in _form.html.haml
= f.text_field :name, #{add_disabled}
this will call the helper method and return "disabled='disabled'" depending upon the controller and action
Related
I am confused by the addition of [:session] to params. It also seems to break my website. Can someone please explain what this does for me?
class SessionsController < ApplicationController
.
.
.
def create
user = User.find_by_email(params[:session][:email])
if user && user.authenticate(params[:session][:password])
sign_in user
redirect_back_or user
else
flash.now[:error] = 'Invalid email/password combination'
render 'new'
end
end
.
.
.
end
Error message:
1) Authentication signin with invalid information
Failure/Error: before { click_button "Sign in" }
NoMethodError:
undefined method []' for nil:NilClass
# ./app/controllers/sessions_controller.rb:7:increate'
# (eval):2:in click_button'
# ./spec/requests/authentication_pages_spec.rb:18:inblock (4 levels) in '
EDIT 8/2
I believe the problem is related to a switch from form_for to form_tag. I lost the reference to sessions in the switch because I could not figure out how to properly include it. If anyone has any advice on this issue it would be most appreciated. I am wondering if there is a practical reason for wanting it to be params[:session][:email] instead or is it just for organization?
new.html.erb
<% provide(:title, "Sign in") %>
<h1>Sign in</h1>
<div class="row">
<div class="span6 offset3">
<%= form_tag sessions_path do %>
<%= label_tag :email %>
<%= text_field_tag :email %>
<%= label_tag :password %>
<%= password_field_tag :password %>
<%= submit_tag "Sign in", class: "btn btn-large btn-primary" %>
<% end %>
<p>New user? <%= link_to "Sign up now!", signup_path %></p>
</div>
</div>
Try removing the [:session] brackets, that worked for me
It brakes your code 'cos the params[:session] is nil I think and you trying to get [:email] from nil, what ofcourse should cause the exception. There should be some code in tutorial that defines params[:session] hash. Try to look better.
To make your code stable you have to be sure that params[:session] is always defined or try to use ternar function params[:session] ? params[:session][:email] : ''
You can replace this in your view :
<%= form_for :session, :url => sessions_path do %>
<%= label_tag :email %>
<%= text_field_tag :email %>
<%= label_tag :password %>
<%= password_field_tag :password %>
<%= submit_tag "Sign in", class: "btn btn-large btn-primary" %>
<% end %>
form_tag generate just an HTML form tag and form_for is used to describe something. All the inputs for a field of a form create with form_for will have a name like this : user_session[email]. So, when you submit the form, in your controller, you will have this : params[:user_session][:email].
When the view pass the parameters to controller,
controller gets nil for all of the arguements somehow.
Can anyone how to fix this?? Thanks!
and I have no model called "Message"
controllers/messages_controller.rb
def deliver
recipient = User.find_by_username(params[:recipient])
subject = params[:subject]
body = params[:body]
current_user.send_message(recipient, body, subject)
redirect_to :controller => 'messages', :action => 'received'
flash[:notice] = "message sent!"
end
views/messages/new.html.erb
<%=form_for :messages, url: url_for( :controller => :messages, :action => :deliver ) do |f| %>
<div class="field">
<%= f.label :subject %><br />
<%= f.text_field :subject %>
</div>
<div class="field">
<%= f.label :body %><br />
<%= f.text_field :body %>
</div>
<div class="actions">
<%= f.submit %>
<% end %>
Check your source HTML to better understand what FormHelpers do.
With the form_for f.text_field will generate names attributes in the format:
messages[subject]
Consequently, your params will be in the format:
params[:messages][:subject]
You can also use <%= debug params %> to inspect what's in params, it's very helpful.
You can get parameter value using datas = params[:messages]
These values are in array form. So you can fetch array datas If you want to individual data then usesubject = datas[:subject]
body = datas[:body]
To check run following code in view
<%= subject %>
this gives the value of subject.
I don't understand how access data from my View in other table.
I have few models. First is User, second is UsersPreferences. So i have settings page for users and code looks like this:
<%= render 'shared/error_messages', :object => f.object %>
<div class="field">
<%= f.label :name %><br />
<%= f.text_field :name %>
</div>
...
<div class="checkbox">
<%= f.check_box :notification_about_new_followers %>
<%= f.label 'Notify via email about new followers' %><br />
</div>
This code works (User has row notification_about_new_followers) but i want to change it. I decided that better way is keep preferences in other table. So i created model UsersPreferences which has user_id and flag 'notify_about_new_followers'. I tried to rewrite my view like that:
<%= render 'shared/error_messages', :object => f.object %>
<div class="field">
<%= f.label :name %><br />
<%= f.text_field :name %>
</div>
...
<div class="checkbox">
<%= f.check_box UsersPreferences.find_by_user_id(#user.id).notify_about_new_followers %>
<%= f.label 'Notify via email about new followers' %><br />
</div>
But when i visit page with code i get such error
undefined method `true' for #<User:0x007f8ac180dee8>
How can i solve this error?
User model:
class User < ActiveRecord::Base
attr_accessible :name, ... , :notification_about_new_followers
...
has_one :users_preferences
end
UsersPreferences model:
class UsersPreferences < ActiveRecord::Base
belongs_to :user, :class_name => "User"
attr_accessible :notify_about_new_followers
end
This line:
<%= f.check_box UsersPreferences.find_by_user_id(#user.id).notify_about_new_followers %>
is causing the error. UsersPreferences.find_by_user_id(#user.id).notify_about_new_followers is true, so essentially that line reads:
<%= f.check_box true %>
And like the error says, there is no 'true' attribute for your UserPreferences model.
To fix this you'll need to first read up on MVC (Model-View-Controller). Without knowing how MVC works, you'll never be able to move forward with Rails. There are a lot of great resources out there, just google "Model View Controller for rails". Here is a good one. A little goofy, though... if that's not your style, try another link.
After you have learned that, look up the rails helper fields_for, and there you will find your answer.
I am trying to use form_tag to pass the params captured by the form to my users controller. I am attempting to communicate with a Sinatra server, and so I do not have a database on the client. My view is as follows:
<% form_tag(#user) do %>
<div class="field">
<%= label_tag :first_mame %><br />
<%= text_field_tag :first_name %>
</div>
<div class="field">
<%= label_tag :last_name %><br />
<%= text_field_tag :last_name %>
</div>
<div class="field">
<%= label_tag :email %><br />
<%= text_field_tag "user[email]" %>
</div>
<div class="field">
<%= label_tag :device_id %><br />
<%= text_field_tag "user[device_id]" %>
</div>
<div class="field">
<%= label_tag :type %><br />
<%= text_field_tag "user[device_type]" %>
</div>
<div class="actions">
<%= submit_tag %>
</div>
<% end %>
The create action on my controller is simply:
def create
#user = User.new(params[#user])
#user.save
respond_to do |format|
if #user.save
format.html { redirect_to(#user, :notice => 'User was successfully created.') }
format.json {render :json => #user }
format.xml { render :xml => #user, :status => :created, :location => #user }
else
format.html { render :action => "new" }
format.xml { render :xml => #user.errors, :status => :unprocessable_entity }
end
end
end
Here's what I get as a result => expected an attributes Hash, got nil
Anybody know why? Thanks for the help.
You need to use form_for and not form_tag. form_for(#user) do
In your model you need to create a schema. Without it Rails doesn't know what do with the data you enter into the form.
When you pass the object into the parameter hash use :user and not #user. #user = User.new(params[:user])
For your form you need to do
<%= form_for #user do |f| %>
<div class="field">
<%= f.label :first_name %>
<%= f.text_field :first_name %>
</div>
# more fields
<% end %>
Note the:
<% %> --> <%= %>
form_tag(#user) do --> form_for(#user) do |f|
label_tag --> f.label
text_field_tag --> f.text_field
In you controller:
#user = User.new(params[:user])
Update:
<% %> --> <%= %>: This is just the convention in rails3, when ever you want to write something in the response you should use later(with = sign). Earlier still works but is deprecated.
form_tag(#user) do --> form_for(#user) do |f|
form_tag(#user) do: form_tag is used to for simple forms which are not tied with any model. You can have the tags inside form_tag named so that they resemble form for, but then why wouldn't you use form_for directly. Apparently the first parameter to the helper is target url, and in this particular case rails magically identifies the url from #user and you didn't notice any bug
form_for(#user) do |f|: form_for is used to create a form for a model, and ties up the form with the instance of the model passed to it. The block for form_for receives a form_builder object, which has equivalents of text_field_tag, label_tag etc. as text_field, label
label_tag --> f.label: first is the common tag which just creates a label tag with no magic attached to it.The later is related with the model object and follows different naming and id conventions, than former. It also ties up with the value of the field, i.e. if the field has an error(failed validation), your label will be surrounded by a div tag with class fields_with_error or something, I can't remember the class name.
text_field_tag --> f.text_field: Former will create a field with name first_name with no magic attached. The later follows a naming convention, the input field will be named user[first_name], so that when you do params[:user] you get a first_name parameter there. It also ties up with the value of the field with the html input, i.e. you get the same error functionality as label and you also get the input automatically prefilled with whatever the value field has in the model instance.
I have a two models, Group and User
User belongs_to Group and
Group has_many Users
In my groups/show.html.erb I have the user sign-up form
<h1>Create user</h1>
<%= form_for #user do |f| %>
<%= render 'shared/error_messages', :object => f.object %>
<div class="field">
<%= f.label :name %><br />
<%= f.text_field :name %>
</div>
<div class="field">
<%= f.label :email %><br />
<%= f.text_field :email %>
</div>
<div class="field">
<%= f.label :password %><br />
<%= f.password_field :password %>
</div>
<div class="field">
<%= f.label :password_confirmation, "Confirmation" %><br />
<%= f.password_field :password_confirmation %>
</div>
<div class="actions">
<%= f.submit "Sign up" %>
</div>
<% end %>
To get a relation between the Group and the User I have a create method in my Users controller as follows
def create
#group = Group.find(params[:group][:id])
#user = #group.users.build(params[:user])
if #user.save
flash[:success] = "You have created a new user"
redirect_to group_path
else
#title = "Create user"
render 'new'
end
end
I have also tried:
#group = Group.find(params[:id])
and
#group = Group.find(params[:group_id])
But I still get an error
Essentially I want to create new users in the group/show.html.erb and associate that user with the group where the user was created. If the user is created in groups/3 for example, how do I set my create method in the Users controller to make sure this relation holds?
In general I've been following the Hartl Rails tutorial book at http://ruby.railstutorial.org/chapters/user-microposts#sec:creating_microposts and following the approach for forms and create methods. However I am not sure how to get the params for groups/3 into the find method like #group = Group.find(?????)
Can someone please enlighten me, this issue has been bothering me for a few days now.
Thanks in advance
After the form is submitted, it takes you to the users#create. This route doesn't have a group_id segment.
To pass group_id there, you need to store it in a hidden field in your form.