set default values for thaali

app/controllers/thaalis_controller.rb

@@ -10,14 +10,10 @@ def show
 
   def new
     @thaali = @sabeel.thaalis.new
-    @thaali.year = CURR_YR
 
     if @sabeel.took_thaali?
       took_thaali = @thaalis.where(year: PREV_YR).first
       @thaali.attributes = took_thaali.slice(:number, :size)
-    else
-      # uncheck the default option
-      @thaali.size = nil
     end
   end
 
@@ -27,7 +23,6 @@ def edit
   def create
     @sabeel = Sabeel.find(params[:sabeel_id])
     @thaali = @sabeel.thaalis.new(create_params)
-    @thaali.year = CURR_YR
 
     if @thaali.save
       Rails.cache.write("sabeel_#{@sabeel.id}_taking_thaali?", true)

app/models/thaali.rb

@@ -4,6 +4,10 @@ class Thaali < ApplicationRecord
 
   attr_readonly :total, :year
 
+  # * Defaults
+  attribute :year, default: CURR_YR
+  attribute :size, default: nil
+
   # * Associtions
   belongs_to :sabeel
   has_many :transactions, dependent: :destroy

spec/models/thaali_spec.rb

@@ -13,6 +13,11 @@
   context "with attributes" do
     it { is_expected.to have_readonly_attribute(:year) }
     it { is_expected.to have_readonly_attribute(:total) }
+
+    describe "set default values of" do
+      it { expect(described_class.new.year).to eq(CURR_YR) }
+      it { expect(described_class.new.size).to be_nil }
+    end
   end
 
   context "when validating" do