Hey there,
In our project we have really old self implementation from Rails 2.1 for
original record tracking.
Now we were updated to Rails 4.2 and trying to refactor code to use Rails
methods instead of custom.
I encountered a problem that I have no way to get the original attributes
of the object until they were changed. At the moment, it is possible to
view only the original values using changed_attributes method, but a
complete list of attributes are not possible to receive.
I've implemented patch which extends ActiveModel::Dirty module:
module ActiveModel
module Dirty
def attributes_before_changes
attributes.merge(changed_attributes)
end
end
end
How it works:
u = User.last # => #<User:0x007fa7faf593e0, id: 1, user_name: "test",
user_type_id: 1, params: {:key_1=>"value_1",:key_2=>"value_2"}
u.user_name = "changed_name" # => "changed_name"
u.user_type_id = 2 # => 2
u.params.merge!(key_1: "changed_value_1", key_3: "value_3") # =>
{:key_1=>"changed_value_1",:key_2=>"value_2",:key_3=>"value_3"}
u.attributes #
=>{"id"=>1,"user_name"=>"changed_name","user_type_id"=>2,"params"=>{:key_1=>"changed_value_1",:key_2=>"value_2",:key_3=>"value_3"}}
u.attributes_before_changes #
=>{"id"=>1,"user_name"=>"test","user_type_id"=>1,"params"=>{:key_1=>"value_1",:key_2=>"value_2"}}
It's similar to attributes_before_type_cast method, but returns values as
objects (ActiveSupport::TimeWithZone, serialized fields, etc), not like in
DB.
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