CODEWITHSUNDEEP
ruby-on-railsactiverecordinstance-variables
shub
shub

Reputation: 1052

Insert additional attributes in instance variable

Can somebody help me to insert in my instance an attribute with always the same value?

Actual:

#<Test surname: "example", givename: "test">

Target:

#<Test surname: "example", givename: "test", newvalue: "text">

How do I have to change this code?

@users.each do |user|
  user
end

Or can I implement this with something like :attr_accessor?

Upvotes: 2

Views: 230

Answers (2)

bor1s
bor1s

Reputation: 4113

If you really need the same value for all instances of your class you can do following:

class Some
  def initialize
    @value = "Some value"
  end

  def newvalue
    @value
  end
end

this will give newvalue with "Some value" text for all instances of class Some or whatever you call it. Hope it will help.

Upvotes: 1

davidb
davidb

Reputation: 8954

You need to add a new column to your Model. For that you can use a migration. First create a migration like this:

rails g migration addNewValueToTests

Then you will find the migration file in db/migrations/ there you add a add_column to the self.up method like this:

def self.up
     add_column :table_name, :column_name, :datatype #datatype like integer, sting, text,....
end

then you migrate the database with the rake db:migrate command and the column + setter/getter methods will be added to the model!

// If you just want an alias you can use alias_attribute in the model like this:

alias_attribute :new_name, :current_name

Upvotes: 0

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