Chore: Add default value for label color (#981)

app/models/label.rb

@@ -3,7 +3,7 @@
 # Table name: labels
 #
 #  id              :bigint           not null, primary key
-#  color           :string
+#  color           :string           default("#1f93ff"), not null
 #  description     :text
 #  show_on_sidebar :boolean
 #  title           :string

db/migrate/20200625154254_add_default_value_to_color.rb

@@ -0,0 +1,11 @@
+class AddDefaultValueToColor < ActiveRecord::Migration[6.0]
+  def up
+    Label.where(color: nil).find_each { |u| u.update(color: '#1f93ff') }
+
+    change_column :labels, :color, :string, default: '#1f93ff', null: false
+  end
+
+  def down
+    change_column :labels, :color, :string, default: nil, null: true
+  end
+end

db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 2020_06_25_124400) do
+ActiveRecord::Schema.define(version: 2020_06_25_154254) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "pg_stat_statements"
@@ -274,7 +274,7 @@ ActiveRecord::Schema.define(version: 2020_06_25_124400) do
   create_table "labels", force: :cascade do |t|
     t.string "title"
     t.text "description"
-    t.string "color"
+    t.string "color", default: "#1f93ff", null: false
     t.boolean "show_on_sidebar"
     t.bigint "account_id"
     t.datetime "created_at", precision: 6, null: false