Use nested attributes to avoid repeating validation and save

with_nested_attributes.rb

# Using nested attribute
class Tweet < ActiveRecord::Base
  has_one :location, :dependent => :destroy
  accepts_nested_attributes_for :location
end

class TweetsController < ApplicationController   
  def new
    @tweet = current_user.tweets.new(:location => Location.new) # need to instantiate the Location object
  end
        
  def create
    @tweet = current_user.tweets.build(params[:tweet])
    if @tweet.save
      redirect_to @tweet, :notice => 'Successfully created a Tweet'
    else
      render :new
    end
  end
end


# Use in _form.html.erb

# => <%= form_for @user do |f| %>
# => <%= f.email :email %>
# => <%= f.text_field :name %>
# =>    <%= f.fields_for :location do |a| %>
# =>    <%= a.text_field :adresse %>
# =>  <% end %>
# => <% end %>

without_nested_attributes.rb

# Initial
# Instantiating both tweet & tweet's location, then validating/saving separately...
class Tweet < ActiveRecord::Base
  has_one :location, :dependent => :destroy
end

class TweetsController < ApplicationController     
  def new
    @tweet = current_user.tweets.build
    @location = Location.new
  end
        
  def create
    @tweet = current_user.tweets.build(params[:tweet])
    @location = Location.new(params[:location])
        
    if @tweet.save
      @location.save
      @tweet.location = @location  
      redirect_to @tweet, :notice => 'Successfully created a Tweet'
    else
      render :new
    end
  end
end