CODEWITHSUNDEEP
ruby-on-railsrubyruby-on-rails-4.2
user4965201
user4965201

Reputation: 973

Ruby on Rails detect changes in attributes in update

Hi I have a Rails app in which i wanted to know if an attribute is changed which occurs within the hash let me explain i have params for @user

"foo"=> {"name"=> "name1", "age"=> "15", "height"=> "120"}

now when i change only attribute age i want to know if the age is changed

what i tried is @user.foo_changed? but it will give true whenever anything changes in the foo hash but i want it to be true only when the age is changed . How can i achieve this ?

Upvotes: 1

Views: 4077

Answers (2)

Gagan Gami
Gagan Gami

Reputation: 10251

try :

if @user.foo.age == params[:user][:foo][:age]
     # not changed
else
    # changed
end

OR

@user.foo.age_changed?  # this will work in case foo is associated(nested) model with user and foo table has "age" field

Upvotes: 1

Bartłomiej Gładys
Bartłomiej Gładys

Reputation: 4615

Ruby on Rails provide something methods to do this:

object.attribute_changed?

for example:

User.first.name_changed?

Did you tried this?

@user.age_changed?

You can find more here

Upvotes: 0

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