Ruby on rails method partials?

Question

I was wondering if it is possible to create a method partial in ruby on rails, for example I have this code;-

@cart = Cart.where(:user_id => current_user.id).first if user_signed_in?
@slots = @cart.slots.first
@slot_list = [@slots.slot_one, @slots.slot_two, @slots.slot_three, @slots.slot_four, @slots.slot_five,
              @slots.slot_six, @slots.slot_seven, @slots.slot_eight, @slots.slot_nine, @slots.slot_ten]
@user_products = []
@product = []
@slot_list.each do |item|
  if item.nil?
    p 'Item empty'
  else
    @product << item
  end
end
@product.each do |item|
  items = Product.where(:product_id => item).first
  @user_products << items
end

Written in multiple methods to get the @user_products, I was wondering if there was a way so I don't have to write this all the time and possibly run a method or use a partial?

Would it be worth creating a helper that does this and returns the @user_products variable?

Answer 1

I took my own advice and created two helpers, one to return the @user_products and another to return the @total.

I added the names of the methods to our helper_method

helper_method :user_is_admin?, :authenticate_admin!, :product_available?, :get_user_products!, :get_user_total!

then added these two methods at the bottom of the file;-

get_user_products!

def get_user_products!
      @cart = Cart.where(:user_id => current_user.id).first if user_signed_in?
    @slots = @cart.slots.first
    @slot_list = [@slots.slot_one, @slots.slot_two, @slots.slot_three, @slots.slot_four, @slots.slot_five,
                  @slots.slot_six, @slots.slot_seven, @slots.slot_eight, @slots.slot_nine, @slots.slot_ten]
    @user_products = []
    @product = []
    @slot_list.each do |item|
    if item.nil?
        p 'Item empty'
      else        
        @product << item
    end
    end
      @product.each do |item|
      items = Product.where(:product_id => item).first
      @user_products << items
    end
    return @user_products
end

get_user_total!

def get_user_total!
@total = 0
    @cart = Cart.where(:user_id => current_user.id).first if user_signed_in?
    @slots = @cart.slots.first
    @slot_list = [@slots.slot_one, @slots.slot_two, @slots.slot_three, @slots.slot_four, @slots.slot_five,
                  @slots.slot_six, @slots.slot_seven, @slots.slot_eight, @slots.slot_nine, @slots.slot_ten]

    @user_products = []
    @product = []
    @slot_list.each do |item|
    if item.nil?
        p 'Item empty'
      else        
        @product << item
    end
    end
      @product.each do |item|
      items = Product.where(:product_id => item).first
      @user_products << items
    end
    @user_products.each do |p|
      @total += p.product_price
    end
    return @total
end

To use these methods inside whatever controller you then do the following;-

@user_products = get_user_products!
@total = get_user_total!

Answer 2

I assume this is in a controller?

What you want is to use plain old Ruby objects (POROs). So, you might have something like this:

  class UserProducts
    class << self

      def get(options={})
        @cart = Cart.where(:user_id => current_user.id).first if user_signed_in?
        @slots = @cart.slots.first
        @slot_list = [
          @slots.slot_one, 
          @slots.slot_two, 
          @slots.slot_three, 
          @slots.slot_four, 
          @slots.slot_five,
          @slots.slot_six, 
          @slots.slot_seven, 
          @slots.slot_eight, 
          @slots.slot_nine, 
          @slots.slot_ten
        ]

      @user_products = []
      @product = []
      @slot_list.each do |item|
        if item.nil?
          p 'Item empty'
        else                
          @product << item
        end
      end
      @product.each do |item|
        items = Product.where(:product_id => item).first
        @user_products << items
      end
    end
  end

Then, in your controller, you'd do something like:

class FooController < ApplicationController
  def index
    UserProducts.get(user_id: current_user.id)
  end
end

So, UserProducts is essentially a service object. I think some people call them use cases. I tend to call them 'managers'. I put them in their own directory as app/managers/user_products.rb .