Undefined method `build_for` for class in Rails - ruby-on-rails

Question

I have a simple app in which I want to allow the admin to create a new company. My create method in the controller is as follows:
def create
#company = Company.find_by({ name: company_create_params[:company_name] })
if #company.nil?
#company = Company.build_for(company_create_params)
else
return render :status => 200, :json => {
:error => true,
:reason => 'This company already exists in the database!'
}
end
if #company.save
return render :status => 200, :json => {
:success => true
}
else
return render :status => 500, :json => {
:error => true,
:reason => 'There was a problem adding the company'
}
end
end
private
def company_create_params
params.require(:company).permit( :company_name, :company_total_credits )
end
And my company model is:
class Company < ActiveRecord::Base
has_many :role
end
But every time I make an API post it gives me an error Undefined methodbuild_forfor class #<....>
Is it because of the has_many relationship? I don't want to add any value for the roles, rather I want them to be able to do it later on. Is there no way to fix this?

Answer 1

ActiveRecord doesn't provide a build_for method, hence the error.
You probably meant build, which is a method defined on collection associations. In this case, you probably want new or create since Company is a model, not an association.
Your whole action could be reduced significantly by following some conventions, by the way:
class Company < ActiveRecord::Base
has_many :roles
validates :company_name, uniqueness: true
end
# controller
def create
#company = Company.new(company_create_params)
if #company.save
render json: { success: true }
else
render status: 500, json: {
error: true,
reason: #company.errors.full_messages.to_sentence
}
end
end