add nice statistics

app/models/activity.rb

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+class Activity < ApplicationRecord
+  belongs_to :user
+end

app/models/login.rb

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+class Login < ApplicationRecord
+  belongs_to :user
+end

app/models/shakti.rb

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+class Shakti < ApplicationRecord
+end

app/models/statistics.rb

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+class Statistics
+  attr_reader :user
+
+  def initialize(user)
+    @user = user
+  end
+
+  def total_plays
+    Activity.where(user: user).count
+  end
+
+  def activity_by_day
+    start_date = 1.year.ago.to_date
+    end_date = Date.today
+    activities = Activity.where(user: user, created_at: start_date.beginning_of_day..end_date.end_of_day)
+    activities.group("DATE(created_at)").count.transform_keys { |d| d.to_s }
+  end
+
+  def top_artists_all_time
+    Activity.where(user: user)
+      .group(:item_title).order("count_id DESC").limit(5).count(:id)
+  end
+
+  def top_artists_year
+    year_start = Date.today.beginning_of_year
+    Activity.where(user: user, created_at: year_start..Date.today.end_of_day)
+      .group(:item_title).order("count_id DESC").limit(5).count(:id)
+  end
+
+  def top_artists_upcoming
+    upcoming_start = 30.days.ago.to_date
+    upcoming_end = Date.today
+    Activity.where(user: user, started_at: upcoming_start.beginning_of_day..upcoming_end.end_of_day)
+      .group(:item_title).order("count_id DESC").limit(5).count(:id)
+  end
+
+  def since_date
+    Activity.where(user: user).order(:created_at).limit(1).pick(:created_at)
+  end
+end

app/models/user.rb

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+class User < ApplicationRecord
+  # Include default devise modules. Others available are:
+  # :confirmable, :lockable, :timeoutable, :trackable and :omniauthable
+  devise :database_authenticatable, :registerable,
+         :recoverable, :rememberable, :validatable
+end