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referencing foreign key attributes rails


referencing foreign key attributes rails

By : Steven Davis
Date : November 20 2020, 03:01 PM
seems to work fine I think you should use belongs_to instead of has_one as your association. That will cause ActiveRecord to look for the buyer_id foreign key in the virtual_transactions table:
code :
class VirtualTransaction < ApplicationRecord
  belongs_to :buyer, :class_name => 'User', :foreign_key => 'buyer_id'
  belongs_to :seller, :class_name => 'User', :foreign_key => 'seller_id'
end


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How to pass foreign key attributes down through a nested form in Rails 3

How to pass foreign key attributes down through a nested form in Rails 3


By : Ronny
Date : March 29 2020, 07:55 AM
Any of those help This might be a total hack for all I know, but all I know is very limited. What I ended up doing here was user jQuery to take the id from the balancesheet and force it into a hidden field for investment_asset. jQuery:
code :
// get the value from the balancesheet hidden field that contains the user_id value
var balsheetclientid = jQuery('#hiddenid').attr('value'); 
// insert it into the value attribute in the hidden field with class name .iaclientid
jQuery('.iaclientid').val(balsheetclientid) 
<%= f.hidden_field :client_id, :class => 'iaclientid', :value => '' %> 
Differences between *, self.* and @* when referencing associations/attributes in Ruby/Rails Models/Controllers

Differences between *, self.* and @* when referencing associations/attributes in Ruby/Rails Models/Controllers


By : user3226252
Date : March 29 2020, 07:55 AM
wish of those help self.x/self.x=y are always method calls.
(self.x is just sugar for self.__send__(:x) and self.x = y is really just sugar for self.__send__(:x=, y))
code :
def x; @x; end
def x= (y); @x = y; end
Referencing an associated ActiveRecord model's attributes efficiently (Rails 4)

Referencing an associated ActiveRecord model's attributes efficiently (Rails 4)


By : Juan Salvador Pérez
Date : March 29 2020, 07:55 AM
wish helps you Say I have a Post and User model where the User has_many posts. The User model has a name property. , You could try:
code :
Post.includes(:user)
Referencing attributes across multiple tables in Rails

Referencing attributes across multiple tables in Rails


By : EmbeddedG
Date : March 29 2020, 07:55 AM
I hope this helps you . I'm not entirely sure if this is the same as what you're asking, but using has_many and belongs_to may be a better solution. Using these associations would allow an employee to have many employers and then simply get the most recent one.
Please feel free to correct me if this isn't what you are asking.
Creating a Rails 5 migration for foreign key(s) referencing their own table

Creating a Rails 5 migration for foreign key(s) referencing their own table


By : Miguel M. Anastacio
Date : March 29 2020, 07:55 AM
will be helpful for those in need I disagree with neongrau. You don't need a second table to achieve this. It can be done by making a dynamic self join in your dogs table. You would first declare all the relationships in a single model, and their foreign keys respectively:
models/dog.rb:
code :
class Dog < ActiveRecord::Base
  belongs_to :mom, class_name: "Dog", foreign_key: "mom_id"
  belongs_to :dad, class_name: "Dog", foreign_key: "dad_id"
  has_many :kids, class_name: "Dog"
end
class CreateDogs < ActiveRecord::Migration
  def change
    create_table :dogs do |t|
      t.string :name
      t.integer :age
      t.references :mom
      t.references :dad
      t.integer :dog_id

      t.timestamps null: false
    end
end
   kid = Dog.create(name: "Rover")
    => #<Dog id: 8, name: "Rover"..>

   ma = Dog.create(name: "Susie")
   => #<Dog id: 2, name: "Susie"..>

   pa = Dog.create(name: "Doug")
   => #<Dog id: 8, name: "Doug"..>

kid.mom_id = 2
kid.save

kid.mom
 => #<Dog id: 2, name: "Susie"...>

kid.dad_id = 3
kid.save

kid.dad
 => #<Dog id: 3, name: "Doug"...>


ma.kids << kid
ma.save

ma.kids
 => #<Dog id: 1, name: "Rover"...>

pa.kids << kid 
pa.save

pa.kids
 => #<Dog id: 1, name: "Rover"...>
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