ruby - Rails class name/type not working for a polymorphic has_many :through -

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I have an invoicing system that manages debits and credits. Invoice amount is originally received from the amount of its debit and the balance takes its credit and deducts it from the total amount.

I am doing it with four models.

  • Line Item
  • Debit
  • Credit

    • By the way It works through an inserted model (line item), which is called a polymorphic association, which is called recordable. At first glance, everything seems to work properly However, inspecting the line object indicates that the recordable_ID looks fine, so the recordable_type is zero.

    There is a section of code here: 

      class invoice & lt; ActiveRecord :: Base is - Medium: Line_Entems, Dependent = & gt; : Has_many deleted: debit, through: = & gt; : Line_tyme, as in: = & gt; : Is recordable_image: credits, through: = & gt; : Line_tyme, as in: = & gt; : Recordable End Class LineItem & lt; ActiveRecord :: Base is_to: Invoice is_to: recordable ,: polymorphic = & gt; The truth is included: credit, class_name = & gt; "Credit",: foreign_key => "Recordable_id" belong_to: debit ,: class_name = & gt; "Debit" ,: foreign_key => "Recordable_head" end class credit & lt; ActiveRecord :: Base has_many: line_items ,: as = & gt; : Recordable ,: Dependent = & gt; : Delete and Debit Debit & lt; ActiveRecord :: Base has_many: line_items ,: as = & gt; : Recordable ,: Dependent = & gt; Has anyone told me in the right direction?   
     
       
     You are unclear on your  LineItem  class The organizations are declaring 
     
     In short,  related_to  does this in your class: 
     
       
    1.   related_to: invoice  a method  Invoice  that searches for  invoice  table for records referenced by  invoice_id  
      2.  
    2.   related_to: recordable, : Polygonity = & gt; Searches the  recordable_type.underscore.pluralize  table for a record referenced by  recordable_id  
      3. , which is a  recordable  Li>  related_to: credit,: class_name = & gt; "Credit",: foreign_key => Creates "Recordable_id"  a method  credit  that searches through the  credit  table for records referenced by  recordable_id . Note that  recordable_type  is ignored here  
    3.  In this order, it applies to  related_to: debit . 
      4.  
     
     Since your line item has only a credit card  or , it does not make any sense to declare these organizations in additional form. You can refer to them by the  recordable  association.

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