#364 Active Record Reputation System

rails g reputation_system
rake db:migrate

gem 'activerecord-reputation-system', require: 'reputation_system'

has_reputation :votes, source: :user, aggregated_by: :sum

has_many :evaluations, class_name: "RSEvaluation", as: :source

has_reputation :votes, source: {reputation: :votes, of: :haikus}, aggregated_by: :sum

def voted_for?(haiku)
  evaluations.where(target_type: haiku.class, target_id: haiku.id).present?
end

resources :haikus do
  member { post :vote }
end

def index
  @haikus = Haiku.find_with_reputation(:votes, :all, order: "votes desc")
end

def vote
  value = params[:type] == "up" ? 1 : -1
  @haiku = Haiku.find(params[:id])
  @haiku.add_or_update_evaluation(:votes, value, current_user)
  redirect_to :back, notice: "Thank you for voting"
end

| <%= pluralize haiku.reputation_value_for(:votes).to_i, "vote" %>
<% if current_user && !current_user.voted_for?(haiku) %>
  | <%= link_to "up", vote_haiku_path(haiku, type: "up"), method: "post" %>
  | <%= link_to "down", vote_haiku_path(haiku, type: "down"), method: "post" %>
<% end %>

<%= current_user.reputation_value_for(:votes).to_i %>

validates_uniqueness_of :haiku_id, scope: :user_id
validates_inclusion_of :value, in: [1, -1]
validate :ensure_not_author

def ensure_not_author
  errors.add :user_id, "is the author of the haiku" if haiku.user_id == user_id
end

def self.by_votes
  select('haikus.*, coalesce(value, 0) as votes').
  joins('left join haiku_votes on haiku_id=haikus.id').
  order('votes desc')
end

def votes
  read_attribute(:votes) || haiku_votes.sum(:value)
end

def total_votes
  HaikuVote.joins(:haiku).where(haikus: {user_id: self.id}).sum('value')
end

def can_vote_for?(haiku)
  haiku_votes.build(value: 1, haiku: haiku).valid?
end

def index
  @haikus = Haiku.by_votes
end

def vote
  vote = current_user.haiku_votes.new(value: params[:value], haiku_id: params[:id])
  if vote.save
    redirect_to :back, notice: "Thank you for voting."
  else
    redirect_to :back, alert: "Unable to vote, perhaps you already did."
  end
end

| <%= pluralize haiku.votes, "vote" %>
<% if current_user && current_user.can_vote_for?(haiku) %>
  | <%= link_to "up", vote_haiku_path(haiku, value: 1), method: "post" %>
  | <%= link_to "down", vote_haiku_path(haiku, value: -1), method: "post" %>
<% end %>

<%= current_user.total_votes %>