activerecord - Rails updating column rows for has_one relationship -

i have added iconfolio character model. each character has_one :iconfolio.

character.rb

has_one :iconfolio, dependent: :destroy accepts_nested_attributes_for :iconfolio before_validation  self.create_iconfolio unless iconfolio end 

here migration file:

class createiconfolios < activerecord::migration   def change     create_table :iconfolios |t|       t.integer :character_id        t.string :icon_url        t.timestamps null: false     end     add_index :iconfolios, :character_id   end end 

the iconfolio class:

iconfolio.rb

class iconfolio < activerecord::base    belongs_to :character    validates :character_id, presence: true    before_create     self.icon_url = '/assets/icon1.png'   end  end 

firstly, how ensure iconfolio has been created each character?

secondly, how update rows in character_id column? character_id value different every iconfolio record. updating icon_url column can done in console:

iconfolio.all.update_all(person_normal_icon_url: '/assets/icon1.png') 

the easiest way create default template iconfolio , update_all character records did iconfolio. if database isn't large can iterate through character.all , assign them iconfolio. advised instantiate object per row , more time consuming update_all. benefit of instantiating them not bypass validations. write block in console iterates through each record , finds or creates iconfolio per character like:

  character.all.find_each |char|      if char.iconfolio.blank?           iconfolio.create(character_id: char.id, whatever_other_params: put_here)      end   end 

then make after_create in character model creates , assigns iconfolio future new characters. like:

after_create :make_an_iconfolio  def make_an_iconfolio    iconfolio.create(character_id: self.id, other params here) end 

as sidenote, rails way add relationship in create_table migration is:

def change     create_table :iconfolios |t|       t.belongs_to :character, index: true 

this makes more clear , others it's relationship , saves line of code indexing.