Rails getting around the edit method - ruby-on-rails

I have two models: Photo and Product. These are associated via has_many and nested in.
In my 'create' action in my product controller I associate all the photos the user uploaded that have not been linked to a product. (I do it this way because photos are added via ajax).
Now on the edit page. I want to add photos. Which would require me to link photos to a product. Before I did that in the create action. But as you know in Rails there is no real edit action. Because of this there is nowhere in my products controller I join the two.
So, how do I get around this?
P.S. I can't join the two in the photo controller before you ask
product controller
def new
Photo.where(:product_id => nil, :user_id => current_user).delete_all
#product = Product.new
#photo = Photo.new
end
def create
binding.pry
#product = current_user.products.create(params[:product])
if #product.save
Photo.where(:product_id => nil, :user_id => current_user).update_all(:product_id => #product.id)
render "show", notice: "Product created!"
else
render "new", error: "Error submitting product"
end
end
def edit
#product = Product.find(params[:id])
#photo = Photo.new
end
photo controller
def create
#photo = Photo.new(params[:photo])
respond_to do |format|
#photo.user_id = current_user.id
if #photo.save
format.html {
render :json => [#photo.to_jq_image].to_json,
:content_type => 'text/html',
:layout => false
}
format.json { render json: {files: [#photo.to_jq_image]}, status: :created, location: #photo }
else
format.html { render action: "new" }
format.json { render json: #photo.errors, status: :unprocessable_entity }
end
end
end

There is a method for that
def update
end
exists

It may help if you used the scaffolding at least once to observe a typical rails controller. I'd pay attention to the methods generated.

Related

Rails: Understanding Query Model Syntax

I have my Ruby on Rails app up and running with 3 scaffolded models. So far so good. Now I'm coding business logic and get a syntax error and can't quite understand how to code a variable.
Details:
3 models: Document, Employee, and EmpDocument.
Business rule: Each time a new Document is added create an EmployeeDocument for each Employee
1.) Loop through Employees
2.) Cut an EmpDocument.rcd
I get an error on the .Create line, because I don't have my variables coded correctly.
I've looked through documentation without finding any rules/examples.
Document.Model
def create
#document = Document.new(document_params)
respond_to do |format|
if #document.save
format.html { redirect_to #document, notice: 'Document was successfully created.' }
format.json { render :show, status: :created, location: #document }
# create an EmpDocument record for each employee for this new document
##employees = Employee.find(:all)
Employee.all.each do |employee|
Empdocument.Create(:document_id => #document.document_id, :employee_id => employee.employee_id, :viewed => '0001-01-01')
end
else
format.html { render :new }
format.json { render json: #document.errors, status: :unprocessable_entity }
end
end
end
here's the error:
"undefined method `document_id' for #"
##employees = Employee.find(:all)
Employee.all.each do |employee|
Empdocument.Create(:document_id => #document.document_id, :employee_id => employee.employee_id, :viewed => '0001-01-01')
end
For your current requirement, I would encourage you to look into the after_create callback in ActiveModel.
What you can do then in your Document Model is
after_create :create_emp_documents
def create_emp_documents
Employeee.all.each do |employee|
self.empdocuments.create(employee_id: employee.id)
end
end

How do I display error messages in the same URL as the form URL in Rails forms?

(I've broken out the 2nd question that originally was part of this post into a separate post)
I am creating a product landing page with Rails in which users can enter their email address to be notified when the product launches. (Yes, there are services/gems etc that could do this for me, but I am new to programming and want to build it myself to learn rails.)
On submit of the form, if there are errors, the app currently redirects to '/invites' I would like to instead display error messages on the same page/URL as the original form? (In my case, the form is located at root while the error messages are displaying at '/invites')
I have read the Rails Guide on Routes and numerous stackoverflow posts on handling form errors nothing I've found seems to answer the question I have.
Update: Based on the reply from #rovermicrover I would like to clarify that, while I'm open to an Ajax solution, I'm fine with a page refresh that displays the error message. (I was not able to get the recommendation by #rovermicrover to function as desired - see my response to that solution below for more details.)
What I did:
Invite model:
class Invite < ActiveRecord::Base
attr_accessible :email
validates :email, :presence => {:message => "Please enter an email address."}
end
My routes file:
SuggestionBoxApp::Application.routes.draw do
root to: 'invites#new'
resources :invites
end
This is what I have in the Invites controller (I've only included the actions I'm referencing: new, create, show - it's basically the default of what Rails might generate):
class InvitesController < ApplicationController
def show
#invite = Invite.find(params[:id])
respond_to do |format|
format.html # show.html.erb
format.json { render json: #invite }
end
end
def new
#invite = Invite.new
respond_to do |format|
format.html # new.html.erb
format.json { render json: #invite }
end
end
def create
#invite = Invite.new(params[:invite])
respond_to do |format|
if #invite.save
format.html { redirect_to #invite }
format.json { render json: #invite, status: :created, location: #invite }
else
format.html { render action: "new" }
format.json { render json: #invite.errors, status: :unprocessable_entity }
end
end
end
end
Please let me know if there is any additional info I can provide in helping to answer this question. Thanks!
Make the form 'remote'
form_for #invite, :remote => true
....
Then in the controller
def create
#invite = Invite.new(params[:invite])
respond_to do |format|
if #invite.save
format.html { redirect_to #invite }
format.js { render :action => 'create_suc'}
else
format.html { render action: "new" }
format.js { render :action => 'create_fail' }
end
end
end
/invites/create_suc.js.erb
$('#errors').remove()
$('#new_invite').prepend("<div class='Thanks'>Thanks for signing up</div>")
$('#new_invite').hide("")
/invites/create_fail.js.erb
$('#new_invite').html('<%= escape_javascript render("form", :invite => #invite) %>');
Forms is a partial with your.... form in it, and also the handling of all errors on #invite.
There is a way to do this without resorting the making the form submit "remote", from a pure Ruby on Rails perspective. However, you can do this only if the browser has enabled cookies.
The idea is to save the form data in the session information in case of an error.
Just remember to delete the session data in case of success.
def new
#invite = Invite.new(session[:invite])
respond_to do |format|
format.html # new.html.erb
format.json { render json: #invite }
end
end
def create
#invite = Invite.new(params[:invite])
respond_to do |format|
if #invite.save
session.delete(:invite)
format.html { redirect_to #invite }
format.json { render json: #invite, status: :created, location: #invite }
else
session[:invite] = params[:invite]
format.html { render action: "new" }
format.json { render json: #invite.errors, status: :unprocessable_entity }
end
end
end

How to get name of model linked from another model in Rails?

I have set up 2 models in Rails:
class Category < ActiveRecord::Base
attr_accessible :name
has_many :platforms
end
and
class Platform < ActiveRecord::Base
attr_accessible :name, :url, :country
validates :name, :presence => true, :length => { :minimum => 5 }
validates :url, :presence => true, :length => { :minimum => 5 }
belongs_to :categories
end
This is my platform controller :
class PlatformsController < ApplicationController
# GET /platforms
# GET /platforms.json
def index
#platforms = Platform.all
#categories = Category.all
respond_to do |format|
format.html # index.html.erb
format.json { render json: #platforms }
end
end
# GET /platforms/1
# GET /platforms/1.json
def show
#platform = Platform.find(params[:id])
#categories = Platform.categories
respond_to do |format|
format.html # show.html.erb
format.json { render json: #platform }
end
end
# GET /platforms/new
# GET /platforms/new.json
def new
#platform = Platform.new
#categories = Category.all
respond_to do |format|
format.html # new.html.erb
format.json { render json: #platform }
end
end
# GET /platforms/1/edit
def edit
#platform = Platform.find(params[:id])
#categories = Category.find(:all)
end
# POST /platforms
# POST /platforms.json
def create
#platform = Platform.new(params[:platform])
##categories = Category.new(params[:name])
#categories = #platform.categories.create(params[:categories])
respond_to do |format|
if #platform.save
format.html { redirect_to #platform, notice: 'Platform was successfully created.' }
format.json { render json: #platform, status: :created, location: #platform }
else
format.html { render action: "new" }
format.json { render json: #platform.errors, status: :unprocessable_entity }
end
end
end
# PUT /platforms/1
# PUT /platforms/1.json
def update
#platform = Platform.find(params[:id])
#categories = Category.find(:all)
respond_to do |format|
if #platform.update_attributes(params[:platform])
format.html { redirect_to #platform, notice: 'Platform was successfully updated.' }
format.json { head :no_content }
else
format.html { render action: "edit" }
format.json { render json: #platform.errors, status: :unprocessable_entity }
end
end
end
# DELETE /platforms/1
# DELETE /platforms/1.json
def destroy
#platform = Platform.find(params[:id])
#platform.destroy
respond_to do |format|
format.html { redirect_to platforms_url }
format.json { head :no_content }
end
end
end
I do not understand what I do wrong, but it doesnt correctly assign categories to platforms, and also in the platforms index view, when I try to use :
<%= platform.categories %>
it gives me error cannot find Category with id= "and here the respective id"
I am really confused since I followed tutorial for this one.
I use Rails 3.2.8
Without your view, I can't say for sure what it is you're trying to do exactly. Most importantly, what is in your params[:categories] hash? Given the name, it sounds like you intended for it to be multiple categories. However, your code is written as if you intended it to be a single set of attributes which describe one Category.
Since I can't say for sure what you want to do, I'll answer your question by explaining what you are doing. Maybe that will help you figure out how to fix it.
Your create code currently looks like this:
# POST /platforms
# POST /platforms.json
def create
#platform = Platform.new(params[:platform])
##categories = Category.new(params[:name])
#categories = #platform.categories.create(params[:categories])
The first line creates the new Platform and is easy. Skipping over the comment to the third line. This is probably what's tripping you up.
You are selecting the associations for your newly created Platform and trying to create a new category with attributes as stored in the params[:categories] hash. I'm afraid this is not allowed. (I think it throws an ActiveRecord::RecordNotSaved exception, but I could be wrong.) You can not create on a #platform which hasn't been persisted yet. Instead, I think you want build.
Here is the relevant documentation:
http://api.rubyonrails.org/classes/ActiveRecord/Associations/ClassMethods.html
The difference between create and build is that build just sets up the association without actually saving it to the database yet. create saves it immediately. The nice thing about build is that you don't actually have to save it yourself. It tags along for free when you call #platform.save or #platform.update_attributes. Also, save is automatically wrapped in a transaction, so it won't create the new Category if it fails to create the new Platform for whatever reason.
The next interesting thing is that you are assigning the result of your create to #categories. I don't think this is what you want either. You don't need to save the new Category because it tags along with your #platform. However, if the save of the platform fails, then you are going to re-render your new view with this value of #categories whereas in new you set #categories = Category.all. This could certainly cause some confusion on the new view after a failed create.
In summary, I think your create code should look something like the following.
# POST /platforms
# POST /platforms.json
def create
#platform = Platform.new(params[:platform])
#platform.categories.build(params[:categories])
respond_to do |format|
if #platform.save
format.html { redirect_to #platform, notice: 'Platform was successfully created.' }
format.json { render json: #platform, status: :created, location: #platform }
else
#categories = Category.all
format.html { render action: "new" }
format.json { render json: #platform.errors, status: :unprocessable_entity }
end
end
end
If you're params[:categories] is not a hash of category attributes and is actually a comma delimited string of category names, then you would want to do something like the following instead of my second line above:
params[:categories].split(",").each do |category|
#project.categories.build(name: category)
end
You may also want to check out accepts_nested_attributes_for which can DRY out your controller even more.
http://api.rubyonrails.org/classes/ActiveRecord/NestedAttributes/ClassMethods.html
I hope that helps.

How to automaticly assigned a entry a unique id for use in a relationship?

A basic overview of my app. There is currently two models. A jobs model and a clients model. Both models have a has_and_belongs_to_many relationship as I intended to allow the user to create a client entry and then assign them one or many jobs.
Here are both of my models.
Clients -
class Client < ActiveRecord::Base
has_and_belongs_to_many :job
end
Jobs -
class Job < ActiveRecord::Base
has_and_belongs_to_many :client
end
I have been doing some research and I think im right in thinking that the relationship needs a foreign key to function so have added a client_id column & a job_id column to my database.
The clients page is currently working and here is my controller for that.
class ClientsController < ApplicationController
def index
#clients = Client.all
respond_to do |format|
format.html # index.html.erb
format.json { render json: #clients }
end
end
# GET /Clients/1
# GET /Clients/1.json
def show
#clients = Client.find(params[:id])
respond_to do |format|
format.html # show.html.erb
format.json { render json: #clients }
end
end
# GET /Clients/new
# GET /Clients/new.json
def new
#clients = Client.new
respond_to do |format|
format.html # new.html.erb
format.json { render json: #clients }
end
end
# GET /Clients/1/edit
def edit
#clients = Client.find(params[:id])
end
def create
#clients = Client.new(params[:client])
respond_to do |format|
if #clients.save
format.html { redirect_to #clients, notice: 'Client was successfully created.' }
format.json { render json: #clients, status: :created, location: #clients }
else
format.html { render action: "new" }
format.json { render json: #clients.errors, status: :unprocessable_entity }
end
end
end
# PUT /Clients/1
# PUT /Clients/1.json
def update
#clients = Client.find(params[:id])
respond_to do |format|
if #clients.update_attributes(params[:client])
format.html { redirect_to #clients, notice: 'Client was successfully updated.' }
format.json { head :no_content }
else
format.html { render action: "edit" }
format.json { render json: #clients.errors, status: :unprocessable_entity }
end
end
end
# DELETE /Clients/1
# DELETE /Clients/1.json
def destroy
#clients = Client.find(params[:id])
#clients.destroy
respond_to do |format|
format.html { redirect_to :clients , notice: 'Client was successfully removed.'}
format.json { head :no_content }
end
end
def details
#clients = Client.find_by_id(params[:id])
#jobs = Client.job
end
end
And here's what I currently have for my jobs controller.
class JobsController < ApplicationController
def index
#jobs = Job.find(:all)
respond_to do |format|
format.html # index.html.erb
format.xml { render :xml => #job }
end
end
def new
#jobs = Job.new
respond_to do |format|
format.html # index.html.erb
format.xml { render :xml => #job }
end
end
def create
#jobs = Job.new(params[:job])
#cients = Client.find = Client.find(params[:id])
respond_to do |format|
if #jobs.save
format.html { redirect_to(#jobs,
:notice => 'Job was successfully created.') }
format.xml { render :xml => #jobs,
:status => :created, :location => #Job }
else
format.html { render :action => "new" }
format.xml { render :xml => #jobs.errors,
:status => :unprocessable_entity }
end
end
end
end
In my jobs form I was given thr following code which added a drop down with all the created clients.
<%= select("job", "client_id", Client.all.collect {|c| [ c.name, c.id ] }, {:include_blank => 'None'})%>
When I press save though. I recieve the following error.
unknown attribute: client_id
Application Trace | Framework Trace | Full Trace
app/controllers/jobs_controller.rb:22:in `new'
app/controllers/jobs_controller.rb:22:in `create'
I assume this is because I need to define a way of finding the client_id in my job creation as well as specifying one in my client creation.
This is my first rails app though so im not quite sure how.
Any help would be greatly appreciated.
Your jobs table doesn't have a client_id, nor should it. You need to create a junction table to facilitate a many-to-many relationship. It should be called clients_jobs and contain an integer client_id and job_id.
There is a lot more wrong here. Here are just the things I caught at a casual glance:
This line:
#cients = Client.find = Client.find(params[:id])
should be:
#cients = Client.find(params[:id])
Pluralization is important in Rails. A client doesn't have many "job". It has many jobs. Your models should reflect this:
class Client < ActiveRecord::Base
has_and_belongs_to_many :jobs
end
class Job < ActiveRecord::Base
has_and_belongs_to_many :clients
end
You'll need to create a junction table via a migration, which is where your foreign keys will exist:
$ rails g migration AddClientsJobsTable
In index and new, you first create #jobs = Job.new and then you render it via :xml => #job. Again, pluralization is important. You need #job = Job.new. You have the same problem in create, except you've dropped the 's' and capitalized the 'J': :location => #Job } You can't do that in programming. Case and spelling both matter.
Job.find(:all) or Client.all: Pick one. Don't mix find :all and .all.
#clients = Client.find(params[:id]). You're finding a single specific Client, not a collection of clients. Your variable should be called #client. This is not an error, but it is seriously ugly.
pluralize your jobs and clients in your associations. I.E
has_many_and_belongs_to :jobs
has_many_and_belongs_to :clients
And if you do not use the alternative to this many-to-many associations with the ActiveRecord :through method (the alternative to HMABT) You must create the join table yourself which is a table of job_id's and client_id's.

Nice way of doing dual column validation

I'm using Rails 3 for this one. I've got a collections model, a user model and an intermediate subscription model. This way a user can subscribe to multiple collections, with a particular role. However, I don't want a user to be able to subscribe to the same collection twice.
So in my Subscription model I've got something like:
validate :subscription_duplicates
def subscription_duplicates
self.errors.add_to_base "This user is already subscribed" if Subscription.where(:user_id => self.user.id, :collection_id => self.collection.id)
end
However this seems ugly. Also, it breaks when I want to do something like the following in my collection controller:
def create
#collection = Collection.new(params[:collection])
#collection.subscriptions.build(:user => current_user, :role => Subscription::ROLES['owner'])
#collection.save
respond_with(#collection)
end
When I do the build the subscription does not have an id so I get a "Called id for nil" error.
Thanks for any guidance!
use validates_uniqueness_of
validates_uniqueness_of :user_id, :scope => :collection_id
First of all, your create action should always test if the object was saved, and if not then handle that (usually by re-rendering the new/edit page and showing the errors to the user).
A standard sort of create action would look like this (for a #post in this case):
def create
#post = Post.new(params[:post])
#created = #post.save
respond_to do |format|
if #created
flash[:notice] = 'Post was successfully created.'
format.html { redirect_to #post }
format.xml { render :xml => #post, :status => :created, :location => #post }
format.js
else
format.html { render :action => :new } #or edit or wherever you got here from
format.xml { render :xml => #post.errors, :status => :unprocessable_entity }
format.js
end
end
end
Shingara's approach to avoiding duplicates should work fine for you.

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