FIX: Use a logging table for daily likes given. Use it for badges.

app/controllers/post_actions_controller.rb

@@ -23,15 +23,6 @@ class PostActionsController < ApplicationController
       @post.reload
       render_post_json(@post, _add_raw = false)
     end
-  rescue RateLimiter::LimitExceeded => e
-    # Special case: if we hit the create like rate limit, record it in user history
-    # so we can award a badge
-    if e.type == "create_like"
-      UserHistory.create!(action: UserHistory.actions[:rate_limited_like],
-                          target_user_id: current_user.id,
-                          post_id: @post.id)
-    end
-    render_rate_limit_error(e)
   end
 
   def destroy

app/models/badge.rb

@@ -286,11 +286,11 @@ SQL
 
     def self.like_rate_limit(count)
       <<-SQL
-        SELECT uh.target_user_id AS user_id, MAX(uh.created_at) AS granted_at
-        FROM user_histories AS uh
-        WHERE uh.action = #{UserHistory.actions[:rate_limited_like]}
-          AND (:backfill OR uh.target_user_id IN (:user_ids))
-        GROUP BY uh.target_user_id
+        SELECT gdl.user_id, current_timestamp AS granted_at
+        FROM given_daily_likes AS gdl
+        WHERE gdl.limit_reached
+          AND (:backfill OR gdl.user_id IN (:user_ids))
+        GROUP BY gdl.user_id
         HAVING COUNT(*) >= #{count}
       SQL
     end

app/models/given_daily_like.rb

@@ -0,0 +1,34 @@
+class GivenDailyLike < ActiveRecord::Base
+  belongs_to :user
+
+  def self.find_for(user_id, date)
+    where(user_id: user_id, given_date: date)
+  end
+
+  def self.increment_for(user_id)
+    return unless user_id
+    given_date = Date.today
+
+    # upsert would be nice here
+    rows = find_for(user_id, given_date).update_all('likes_given = likes_given + 1')
+
+    if rows == 0
+      create(user_id: user_id, given_date: given_date, likes_given: 1)
+    else
+      find_for(user_id, given_date)
+              .where('limit_reached = false AND likes_given >= :limit', limit: SiteSetting.max_likes_per_day)
+              .update_all(limit_reached: true)
+    end
+  end
+
+  def self.decrement_for(user_id)
+    return unless user_id
+
+    given_date = Date.today
+
+    find_for(user_id, given_date).update_all('likes_given = likes_given - 1')
+    find_for(user_id, given_date)
+            .where('limit_reached = true AND likes_given < :limit', limit: SiteSetting.max_likes_per_day)
+            .update_all(limit_reached: false)
+  end
+end

app/models/post_action.rb

@@ -286,12 +286,11 @@ SQL
         BadgeGranter.queue_badge_grant(Badge::Trigger::PostAction, post_action: post_action)
       end
     end
+    GivenDailyLike.increment_for(user.id)
 
     # agree with other flags
     if staff_took_action
       PostAction.agree_flags!(post, user)
-
-      # update counters
       post_action.try(:update_counters)
     end
 
@@ -311,6 +310,7 @@ SQL
     if action = finder.first
       action.remove_act!(user)
       action.post.unhide! if action.staff_took_action
+      GivenDailyLike.decrement_for(user.id)
     end
   end
 

app/models/user_history.rb

@@ -52,7 +52,8 @@ class UserHistory < ActiveRecord::Base
                           grant_moderation: 34,
                           revoke_moderation: 35,
                           backup_operation: 36,
-                          rate_limited_like: 37)
+                          rate_limited_like: 37 # not used anymore
+                         )
   end
 
   # Staff actions is a subset of all actions, used to audit actions taken by staff users.

db/migrate/20160317174357_create_given_daily_likes.rb

@@ -0,0 +1,34 @@
+class CreateGivenDailyLikes < ActiveRecord::Migration
+  def up
+    create_table :given_daily_likes, id: false, force: true do |t|
+      t.integer :user_id, null: false
+      t.integer :likes_given, null: false
+      t.date    :given_date, null: false
+      t.boolean :limit_reached, null: false, default: false
+    end
+    add_index :given_daily_likes, [:user_id, :given_date], unique: true
+    add_index :given_daily_likes, [:limit_reached, :user_id]
+
+    max_likes_rows = execute("SELECT value FROM site_settings WHERE name = 'max_likes_per_day'")
+    if max_likes_rows && max_likes_rows.cmd_tuples > 0
+      max_likes = max_likes_rows[0]['value'].to_i
+    end
+    max_likes ||= 50
+
+    execute "INSERT INTO given_daily_likes (user_id, likes_given, limit_reached, given_date)
+             SELECT pa.user_id,
+                    COUNT(*),
+                    CASE WHEN COUNT(*) >= #{max_likes} THEN true
+                    ELSE false
+                    END,
+                    pa.created_at::date
+             FROM post_actions AS pa
+             WHERE pa.post_action_type_id = 2
+               AND pa.deleted_at IS NULL
+             GROUP BY pa.user_id, pa.created_at::date"
+  end
+
+  def down
+    drop_table :given_daily_likes
+  end
+end

spec/controllers/post_actions_controller_spec.rb

@@ -7,20 +7,6 @@ describe PostActionsController do
       expect { xhr :post, :create }.to raise_error(Discourse::NotLoggedIn)
     end
 
-    describe 'logged in as regular user' do
-      before do
-        @user = log_in(:user)
-        @post = Fabricate(:post, user: Fabricate(:coding_horror))
-      end
-
-      it 'creates user history if the rate limit for a like is hit' do
-        PostAction.expects(:act).once.raises(RateLimiter::LimitExceeded.new(60, 'create_like'))
-        expect(-> {
-          xhr :post, :create, id: @post.id, post_action_type_id: PostActionType.types[:like]
-        }).to change(UserHistory, :count).by(1)
-      end
-    end
-
     describe 'logged in as moderator' do
       before do
         @user = log_in(:moderator)

spec/models/given_daily_like_spec.rb

@@ -0,0 +1,50 @@
+require 'rails_helper'
+
+describe GivenDailyLike do
+
+  it 'no errors without a user' do
+    expect(-> { GivenDailyLike.increment_for(nil) }).not_to raise_error
+    expect(-> { GivenDailyLike.decrement_for(nil) }).not_to raise_error
+  end
+
+  context 'with a user' do
+    let(:user) { Fabricate(:user) }
+
+    def value_for(user_id, date)
+      GivenDailyLike.find_for(user_id, date).pluck(:likes_given)[0] || 0
+    end
+
+    def limit_reached_for(user_id, date)
+      GivenDailyLike.find_for(user_id, date).pluck(:limit_reached)[0] || false
+    end
+
+    it 'can be incremented and decremented' do
+      SiteSetting.max_likes_per_day = 2
+
+      Timecop.freeze(Date.today) do
+        dt = Date.today
+
+        expect(value_for(user.id, dt)).to eq(0)
+        expect(limit_reached_for(user.id, dt)).to eq(false)
+
+        GivenDailyLike.increment_for(user.id)
+        expect(value_for(user.id, dt)).to eq(1)
+        expect(limit_reached_for(user.id, dt)).to eq(false)
+
+        GivenDailyLike.increment_for(user.id)
+        expect(value_for(user.id, dt)).to eq(2)
+        expect(limit_reached_for(user.id, dt)).to eq(true)
+
+        GivenDailyLike.decrement_for(user.id)
+        expect(value_for(user.id, dt)).to eq(1)
+        expect(limit_reached_for(user.id, dt)).to eq(false)
+
+        GivenDailyLike.decrement_for(user.id)
+        expect(value_for(user.id, dt)).to eq(0)
+        expect(limit_reached_for(user.id, dt)).to eq(false)
+      end
+    end
+
+  end
+
+end

spec/models/post_action_spec.rb

@@ -168,19 +168,24 @@ describe PostAction do
   describe "update_counters" do
 
     it "properly updates topic counters" do
-      # we need this to test it
-      TopicUser.change(codinghorror, post.topic, posted: true)
+      Timecop.freeze(Date.today) do
+        # we need this to test it
+        TopicUser.change(codinghorror, post.topic, posted: true)
 
-      PostAction.act(moderator, post, PostActionType.types[:like])
-      PostAction.act(codinghorror, second_post, PostActionType.types[:like])
+        expect(GivenDailyLike.value_for(moderator.id, Date.today)).to eq(0)
 
-      post.topic.reload
-      expect(post.topic.like_count).to eq(2)
+        PostAction.act(moderator, post, PostActionType.types[:like])
+        PostAction.act(codinghorror, second_post, PostActionType.types[:like])
 
-      tu = TopicUser.get(post.topic, codinghorror)
-      expect(tu.liked).to be true
-      expect(tu.bookmarked).to be false
+        post.topic.reload
+        expect(post.topic.like_count).to eq(2)
 
+        expect(GivenDailyLike.value_for(moderator.id, Date.today)).to eq(1)
+
+        tu = TopicUser.get(post.topic, codinghorror)
+        expect(tu.liked).to be true
+        expect(tu.bookmarked).to be false
+      end
     end
 
   end
@@ -239,29 +244,33 @@ describe PostAction do
     end
 
     it 'should increase the `like_count` and `like_score` when a user likes something' do
-      PostAction.act(codinghorror, post, PostActionType.types[:like])
-      post.reload
-      expect(post.like_count).to eq(1)
-      expect(post.like_score).to eq(1)
-      post.topic.reload
-      expect(post.topic.like_count).to eq(1)
+      Timecop.freeze(Date.today) do
+        PostAction.act(codinghorror, post, PostActionType.types[:like])
+        post.reload
+        expect(post.like_count).to eq(1)
+        expect(post.like_score).to eq(1)
+        post.topic.reload
+        expect(post.topic.like_count).to eq(1)
+        expect(GivenDailyLike.value_for(codinghorror.id, Date.today)).to eq(1)
 
-      # When a staff member likes it
-      PostAction.act(moderator, post, PostActionType.types[:like])
-      post.reload
-      expect(post.like_count).to eq(2)
-      expect(post.like_score).to eq(4)
+        # When a staff member likes it
+        PostAction.act(moderator, post, PostActionType.types[:like])
+        post.reload
+        expect(post.like_count).to eq(2)
+        expect(post.like_score).to eq(4)
 
-      # Removing likes
-      PostAction.remove_act(codinghorror, post, PostActionType.types[:like])
-      post.reload
-      expect(post.like_count).to eq(1)
-      expect(post.like_score).to eq(3)
+        # Removing likes
+        PostAction.remove_act(codinghorror, post, PostActionType.types[:like])
+        post.reload
+        expect(post.like_count).to eq(1)
+        expect(post.like_score).to eq(3)
+        expect(GivenDailyLike.value_for(codinghorror.id, Date.today)).to eq(0)
 
-      PostAction.remove_act(moderator, post, PostActionType.types[:like])
-      post.reload
-      expect(post.like_count).to eq(0)
-      expect(post.like_score).to eq(0)
+        PostAction.remove_act(moderator, post, PostActionType.types[:like])
+        post.reload
+        expect(post.like_count).to eq(0)
+        expect(post.like_score).to eq(0)
+      end
     end
   end