Rails 4: How to put loop logic inside the controller - ruby-on-rails

Question

I have four loops in my haml document for testing purposes with the only difference being the order of the elements.
Am I somehow able to put the logic in my controller and list the whole 'insidyness' of the loop only once in my haml document?
Currently I have everything duplicated 4 times and ya know, that feels bad. :)
For instance:
- #loop.where(featured: true).order("RANDOM()").limit(4).each do |item|
%li
%h1 This is an example
- #loop.order(:cached_votes_up => :desc).limit(4).each do |item|
%li
%h1 This is an example
- #loop.order(:impressions_count => :desc).limit(4).each do |item|
%li
%h1 This is an example
- #loop.order("created_at DESC").limit(4).each do |item|
%li
%h1 This is an example
Controller:
def index
#loop = Item.all
end
I would like to reduce my Haml Code to something like this and move the rest in the Controller:
- #loop.each do |item|
%li
%h1 This is an example
Thanks in advance for each answer!

Answer 1

You can't render the view multiple times but you could do something like this.
def index
#loops = [
Item.where(featured: true).order("RANDOM()"),
Item.order(:cached_votes_up => :desc),
Item.order(:impressions_count => :desc),
Item.order("created_at DESC")
]
end
And then in the template
- #loops.each do |loop|
- loop.limit(4).each do |item|
%li
%h1 This is an example

Answer 2

in Item model class:
scope :featured_with_random_order_desc, ->(limit_value) { where(featured: true).order("RANDOM()").limit(limit_value) }
scope :by_cached_votes_order_desc, ->(limit_value) { order(:cached_votes_up => :desc).limit(limit_value) }
scope :by_impression_count_order_desc, ->(limit_value) { order(:impressions_count => :desc).limit(limit_value) }
scope :by_created_at_desc, ->(limit_value) { order("created_at DESC").limit(limit_value) }
In your views:
- #loop.featured_with_random_order_desc(4).each do |item|
%li
%h1 This is an example
- #loop.by_cached_votes_order_desc(4).each do |item|
%li
%h1 This is an example
- #loop.by_impression_count_order_desclimit(4).each do |item|
%li
%h1 This is an example
- #loop.by_created_at_desc.limit(4).each do |item|
%li
%h1 This is an example
You can go one more step further and create variable for each loop in your controller:
def index
#loop_featured = Item.featured_with_random_order_desc(4)
#loop_cached_votes = Item.by_cached_votes_order_desc(4)
#loop_impression_counts = Item.by_impression_count_order_desclimit(4)
#loop_by_created = Item.by_created_at_desc(4)
end
and use them in view:
- #loop_featured.each do |item|
%li
%h1 This is an example
- #loop_cached_votes.each do |item|
%li
%h1 This is an example
- #loop_impression_counts.each do |item|
%li
%h1 This is an example
- #loop_by_created.each do |item|
%li
%h1 This is an example

Answer 3

You can use union_scope from ActiveRecord
#item.rb
include ActiveRecord::UnionScope
scope :by_random, -> { where(featured: true).order("RANDOM()").limit(4) }
scope :by_cached_votes, ->{ order(:cached_votes_up => :desc).limit(4) }
scope :by_impression_count, ->{ order(:impressions_count => :desc).limit(4) }
scope :by_created_at, ->{ order("created_at DESC").limit(4) }
scope: all_conditions, -> { union_scope(by_random, by_cached_votes,by_impression_count,by_created_at}
your controller
#item = Item.all_conditions
your view:
- #loop.all_conditions.each do |item|