Rails when creating record, inserting belongs_to association

Question

i have a question about associations in rails. The situation is the following:

Models:

class Character < ActiveRecord::Base has_one :character_stats end class CharacterStats < ActiveRecord::Base belongs_to :character end

Now i need to create stats when a new character is created.

What i doo is this at the moment, i feel like this is a workaround with rails. Is there a more "raily" way to do this?

 after_save :character_init def character_init create_stats end def create_stats stats = CharacterStats.new stats.character_id = self.id // this bothers me! stats.save end

But i feel there should be something like this:

stats.character << self

Thank You in advance :)

EDIT:

here is how my model look in real life:

def create_stats race_stats = Race.find(race_id).race_stats class_stats = RaceClass.find(race_class_id).class_stats stats = CharacterStats.new stats.character_id = self.id stats.health = race_stats.health + class_stats.health stats.mana = race_stats.mana + class_stats.mana stats.intellect = race_stats.intellect + class_stats.intellect stats.armor = race_stats.armor + class_stats.armor stats.magic_resist = race_stats.magic_resist + class_stats.magic_resist stats.attack = race_stats.attack + class_stats.attack stats.defence = race_stats.defence + class_stats.defence stats.save self.character_stats_id = stats.id end

Community · Accepted Answer · 2017-05-23 12:29:26Z

first of all if you want to create CharacterStats after Character is created use after_create callback. About your question you can use ActiveRecord methods which looks like create_character_stats for creating model and build_character_stats for initializing model. So you can change your create_stats method to something like this

def create_stats self.create_character_stats end

or you can change your after callback to this

after_create :create_character_stats

and then you don't need any method for this, but in this case you don't have ability to pass attributes to model creating.

also this question mentioned here Using build with a has_one association in rails

This is quite usefull to know, but i have to pass parameters... i will edit my post for that...

Naren Sisodiya · Accepted Answer · 2014-07-01 07:05:38Z

in rails way you can use the build_association method refer doc. Also the association should be created only when parent object is created so use after_create callback

class Character < ActiveRecord::Base has_one :character_stats after_create :create_stats def create_stats state = self.build_character_stats({}) # empty hash as you are not passing any attributes state.save end end

Also, the model name CharacterStats looks plural and that can violate the naming convention and can cause some issue like resolving association class on run time and so.

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