Accepts_nested_attributes_for how, example

Rails
1

I have following tables with following models:
users(id, role_id) has_many :entries
categories(id, category_name) has_many :entries
entries(id, category_id, user_id) belongs_to :user, belongs_to
:category, has_one :storage
storages(id, title, content, entry_id)* belongs_to :entry*,
has_one
:vote
votes(id, count, storage_id) belongs_to :storage

Now, when user create new entry(through form) few things must happen:
- New row in entry table will be created(with already
existinguser_id and category_id)
- New row in storages table will be created(title and content of
the
post with above entry_id)
- New row in votes table(with above storage_id, count is default
0)

Form for creating new entry have, combo box for selecting category(like:
“Pictures”, “Movies”, etc), text box for title and text-area for
content.

I followed many tutorials and documentation like:
#196 Nested Model Form Part 1 - RailsCasts and
ActiveRecord::NestedAttributes::ClassMethods
but can’t get it how to work.

2

On 10 November 2013 23:24, Srdjan C. [email protected] wrote:

  - New row in entry table will be created(with already existing user_id

but can’t get it how to work.

First, I presume you have worked right through a good tutorial such as
railstutorial.org. If not then go and do that first, then you may be
able to answer the questions yourself.

If you have already done that then there is no point describing the
whole problem area with a long list of things you need to happen and
then just say you can’t get it to work. Start with just one of the
things you want to do and get that working, then add the next
requirement. If you get stuck then come back with a description of
just the bit you can’t get working, show us your code (for the bit
that does not work) and someone will surely help.

Colin

3

Thanks Colin on reply. I tried with following code, which work good but
i
don’t know how to create row in votes table.

// routes.rb
resources :entries, :only =>[:new, :create]

//* entries_controller.rb*
class EntriesController < ApplicationController
def new
@entry = Entry.new(:user_id => 1)
@entry.build_storage
end

def create
Entry.create!(params[:entry].permit(:user_id, :category_id,
:storage_attributes => [:title, :content]))
redirect_to root_url
end
end

// entry.rb
class Entry < ActiveRecord::Base
belongs_to :user
belongs_to :category
has_one :storage

*accepts_nested_attributes_for :storage*

end

// new.html.erb
<%= form_for @entry do |f| %>
<%= f.select :category_id, options_for_select([[“Pictures”, “1”],
[“Status”, “2”]]) %>
<%= f.hidden_field :user_id, :value => @entry.user_id %>

<%= f.fields_for :storage do |storage| %>
    <p>
        <%= storage.label :title %><br>
        <%= storage.text_field :title %>
    </p>
    <p>
        <%= storage.label :content %><br>
        <%= storage.text_area :content %>
    </p>
<% end %>

<%= f.submit "Submit" %>

<% end %>

So now i want to add new row in votes also(votes(id, count, storage_id),
count default = 0).
I assume here i dont need *accepts_nested_attributes_for *because i dont
need to enter anything from form for votes.

4

Thanks Colin on reply. I tried with following code, which work good so
just
wanted to ask is this correct solution, for some reason i think this
code
“smell”.

// routes.rb
resources :entries, :only =>[:new, :create]

// user.rb
class User < ActiveRecord::Base
has_many :entries
end

// category.rb
class Category < ActiveRecord::Base
has_many :entries
end

// entry.rb
class Entry < ActiveRecord::Base
belongs_to :user
belongs_to :category
has_one :storage

accepts_nested_attributes_for :storage

end

// storage.rb
class Storage < ActiveRecord::Base
belongs_to :entry
has_one :vote
end

// vote.rb
class Vote < ActiveRecord::Base
belongs_to :storage
end

// entries_controller.rb
class EntriesController < ApplicationController
def new
@entry = Entry.new(:user_id => current_user.id) * #Pass this to
new.html.erb to use it like hidden field*
@entry.build_storage
end

def create
new_entry = Entry.new(params[:entry].permit(:user_id, :category_id,
:storage_attributes => [:title, :content]))
new_entry.storage.build_vote # Create new row in votes table
new_entry.save

redirect_to root_url

end
end

// views/entries/new.html.erb
<%= form_for @entry do | f | %>
<%= f.select :category_id, options_for_select([[“slike”, “1”],
[“statusi”, “2”]]) %>
<%= f.hidden_field :user_id, :value => @entry.user_id %> #Now
pass
this to create action

<%= f.fields_for :storage do |storage| %>
    <p>
        <%= storage.label :title %><br>
        <%= storage.text_field :title %>
    </p>
    <p>
        <%= storage.label :content %><br>
        <%= storage.text_area :content %>
    </p>
<% end %>

<%= f.submit "Submit" %>

<% end %>