Rails-无法创建具有与该类同名的属性的记录

Question

I'm having troubles trying to create (or even update) a database record, because both the parent class name and the name of an attribute are equal. I'm using a consolidated database, so I can't alter the tables.

I have a class Period with an attribute 'period'. One period has many tax scales.

#period model
has_many :tax_scales, 
    foreign_key: 'period', 
    primary_key: 'period'

#tax_scale model
belongs_to :period, 
    foreign_key: :period,
    primary_key: :period

So, when I use this in my tax_scale view:

#new.html.haml
= f.label :period
= f.number_field :period

I get this error:

Period(#97477176) expected, got String(#8598408)

My controller params are:

params.require(:tax_scale).permit(:minimum, :maximum, ..., :period)

How can I edit (or create) a tax_scale record succesfully?

Answer 1

I found the solution: use methods using self[:attribute], to be sure the attribute is accessed

#tax_scale model
def current_period
  self[:period]
end

def current_period=(p)
  self[:period] = p
end

#new.html.haml
= f.label :current_period
= f.number_field :current_period

Notice I have to use self[:period] and not self.period, because the second one is still accessing the parent record, not the attribute.