By looking at your code, I assume that you have these models in your
application. Site, Country,Payment, SiteUserRole and Event. If that's true
then you don't have to worry about that. The migration, that I shared
before, will iterate through all these models and ID in every database
table will be replaced with generated UUID.
On Monday, October 28, 2013 10:58:18 AM UTC+5, kingston.s wrote:
>
> 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
>>>>>
>>>>
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