I have model called user.
user.rb
class User < ActiveRecord::Base
has_many :sites,:through=>:site_user_roles
belongs_to :country
has_many :payments
has_and_belongs_to_many :events
end
like above i am having lots of association,now i want to migrate all the
relation to uuid.
On Monday, October 28, 2013 10:59:04 AM UTC+5:30, Kashif Umair Liaqat wrote:
>
> I could not understand that what do you mean by single instance migration
> with relation. Can you please elaborate more?
>
> On Monday, October 28, 2013 9:36:41 AM UTC+5, kingston.s wrote:
>>
>> For single instance migration we could do like this,what to be done if i
>> want to migrate single instance with the relation?
>>
>>
>> On Sunday, October 27, 2013 9:57:57 AM UTC+5:30, Kashif Umair Liaqat
>> wrote:
>>>
>>> You might need to write a migration or rake task for this purpose.
>>>
>>> Migration may look like this.
>>>
>>> class MigrateData < ActiveRecord::Migration
>>> def change
>>> get_all_models.each do |model|
>>> model.where('').find_each do |model_instance|
>>> model_instance.update_attributes id:
>>> UUIDTools::UUID.random_create.to_s
>>> end
>>> end
>>> end
>>>
>>> def get_all_models
>>> Module.constants.select do |constant_name|
>>> constant = eval constant_name
>>> if not constant.nil? and constant.is_a? Class and constant.superclass
>>> == ActiveRecord::Base
>>> constant
>>> end
>>> end
>>> endend
>>>
>>> This migration will iterate over all the models in your app and generate
>>> UUID for each single instance.
>>>
>>> On Friday, October 25, 2013 6:17:55 PM UTC+5, kingston.s wrote:
>>>>
>>>> Hi all,
>>>>
>>>> I am using rails 3.1 and ruby 1.9.3,Now i want to use uuid concept in
>>>> rails 3 for existing data
>>>>
>>>> so i did like :-
>>>>
>>>> create_table :posts, :id => false do |t|
>>>> t.string :uuid, :limit => 36, :primary => true
>>>> end
>>>>
>>>> ActiveRecord::Base.class_eval do
>>>>
>>>> # old rails versions
>>>> set_primary_key 'uuid'
>>>>
>>>> before_create :generate_uuid
>>>> def generate_uuid
>>>> self.id = UUIDTools::UUID.random_create.to_s
>>>> end
>>>> end
>>>>
>>>>
>>>> This is working for new data,now i want to migrate existing data with
>>>> relation.for uuid they are using datatype as string,in postgresql the
>>>> data type used for primary_key and foreign key is integer ,so if i am
>>>> trying to change foreign key integer to string it is throwing error.
>>>>
>>>> Could you please tell me some example,how to do this.
>>>>
>>>> kingston.s
>>>>
>>>
--
You received this message because you are subscribed to the Google Groups "Ruby
on Rails: Talk" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
To post to this group, send email to [email protected].
To view this discussion on the web visit
https://groups.google.com/d/msgid/rubyonrails-talk/2fd2c01d-138b-4140-9971-f100d26c0179%40googlegroups.com.
For more options, visit https://groups.google.com/groups/opt_out.
