I'm struggling here with the db migration for the acts_as_commentable_with_threading.
After generating the migration rails generate acts_as_commentable_with_threading_migration I proceeded to add the comment table rake db:migrate. Nothing happened, no error message, just returned to the regular prompt.
Looking at other response to this problem I tried rake db:migrate VERSION= # version number.
Yet here I get an Error response ActiveRecord::UnknownMigrationVersionError:
I must be doing something extremely wrong here since the computer doesn't validate the existence of my comment migration...
UPDATE from #Tiago answer
Ran rails generate migration acts_as_commentable_with_threading_migration
I had to manually create the migration by adding this code to the migration file. Then, thedb:migration worked perfectly.
Why wasn't it working in the first place? The Documentation clearly indicate to run rails generate acts_as_commentable_with_threading_migration.
Just create a migration for yourself as indicated in the gem's page:
rails g migration acts_as_commentable_with_threading_migration
And paste that to the file:
class ActsAsCommentableWithThreadingMigration < ActiveRecord::Migration
def self.up
create_table :comments, :force => true do |t|
t.integer :commentable_id, :default => 0
t.string :commentable_type
t.string :title
t.text :body
t.string :subject
t.integer :user_id, :default => 0, :null => false
t.integer :parent_id, :lft, :rgt
t.timestamps
end
add_index :comments, :user_id
add_index :comments, [:commentable_id, :commentable_type]
end
def self.down
drop_table :comments
end
end
Related
For example, I have a migration file for posts:
class CreatePosts < ActiveRecord::Migration
def change
create_table :posts do |t|
t.text :text
t.integer :ip
t.timestamps
end
end
end
And want to change it to:
class CreatePosts < ActiveRecord::Migration
def change
create_table :posts do |t|
t.text :text
t.integer :ip, :limit => 8
t.timestamps
end
end
end
Would I add a line:
change_column :posts, :ip, :limit => 8
Below so that the file is:
class CreatePosts < ActiveRecord::Migration
def change
create_table :posts do |t|
t.text :text
t.integer :ip, :limit => 8
t.timestamps
change_column :posts, :ip, :limit => 8
end
end
end
And then run heroku run rake --trace db:migrate
I'm having trouble understanding how migrations work, and especially to production, so any help would be greatly appreciated.
There is http://guides.rubyonrails.org/active_record_migrations.html#changing-columns a section 3.5 on column modifiers but it doesn't specify how to pass them.
Thanks!
You should create a separate migration for adding the limit on the ip column.
Generate your migration:
rails generate migration ChangeIpLimitOnPosts
Inside the generated migration file, update the contents:
class ChangeIpLimitOnPosts < ActiveRecord::Migration
def up
change_column :posts, :ip, :integer, limit: 8
end
def down
change_column :posts, :ip, :integer
end
end
Take note here: you need to specify the column type when changing the column, even though in your case, you're not changing the type.
Also, in this case, Active Record will not know how to reverse the transaction if you need to rollback, so you need to explicitly tell Active Record how to do that — this can be done using the up and down methods, rather than change.
Run your migration:
rake db:migrate
On Heroku:
heroku run rake db:migrate
Hope that helps.
Environment:
Windows 8.1
Ruby 2.1.5
rails 4.1.8
I have the following in one of my migration files:
class CreateVotesMigration < ActiveRecord::Migration
def change
create_table(:votes) do |t|
t.integer :item_id
t.integer :user_id
t.integer :vote
t.integer :vote_weight
t.string :vote_scope
t.string :slug
t.timestamps
end
add_index :votes, [:item_id, :user_id, :vote]
add_index :votes, :slug, unique: true
end
end
When I try to run the migration, I get the following error message:
rake aborted!
NameError: uninitialized constant CreateVotes
Any ideas?
Might be stemming from a routing error in your config/routes.rb file. Try checking if you have a route that has that name and change it to match your table.
Your filename need to match the Migration Class name. In your case,
class CreateVotesMigration < ActiveRecord::Migration
the filename would need to be 2014xxxxxxxxxx_create_votes.rb
I currently have the migrate thing like:
class CreateUsers < ActiveRecord::Migration
def change
create_table :users do |t|
t.string :name
t.string :email
t.string :encrypted_password
t.string :salt
t.timestamps
end
end
end
now, if I wanna add two new attributes into this file, one is: t.string :type , and the other one is: t.string :memory_token , how can I do this please?
If you have already run the migration you will have to create a new one.
rails g migration AddTypeToUsers
And then in the migration file you can edit in
change_table :users do |t|
t.string :type
t.string :memory_token
end
Then run a migration rake db:migrate to make the changes
If you haven't run the migration then you can simply add
t.string :type
t.string :memory_token
To that file you have showed us and then run your migration
+1 to #JTG
You can also make this just with one line:
rails g migration AddTypeAndMemoryTokenToUsers type:string memory_token:string
and you will get a following file:
class AddTypeAndMemoryTokenToUsers < ActiveRecord::Migration
def change
add_column :users, :type, :string
add_column :users, :memory_token, :string
end
end
which will make the changes after running rake db:migrate
When I push my rails 4 app to Heroku, I receive the following fatal rake error:
You're trying to register ActiveAdmin::Comment as Comment, but the existing ActiveAdmin::Resource config was built for Comment!
I have a Comment model which has an ActiveAdmin file like this:
# /app/admin/comment.rb
ActiveAdmin.register Comment do
end
An ActiveAdmin migration creates the following active_admin_comments table. I am wondering if this might be related to the conflict, but I am not sure.
class CreateActiveAdminComments < ActiveRecord::Migration
def self.up
create_table :active_admin_comments do |t|
t.string :namespace
t.text :body
t.string :resource_id, :null => false
t.string :resource_type, :null => false
t.references :author, :polymorphic => true
t.timestamps
end
add_index :active_admin_comments, [:namespace]
add_index :active_admin_comments, [:author_type, :author_id]
add_index :active_admin_comments, [:resource_type, :resource_id]
end
def self.down
drop_table :active_admin_comments
end
end
I did have ActiveAdmin working fine on Heroku before this, including both of the files above. I cannot think of what has changed since the last push that could affect the Comment model. Any points of direction would be greatly appreciated!
I jus created a rails application. I created a model using ruby script/generate model Article
next i edited the my 001_create_articles.rb file by adding these lines in self.up method
def self.up
create_table :articles do |t|
t.string :title
t.text :body
t.string :published_at
t.timestamps
end
end
Now i ran rake db:migrate . But migrate does not work, it simply does no print anything. Anyone knows where i am going wrong?
Are you missing one end from your up method?
def self.up
create_table :articles do |t|
t.string :title
t.text :body
t.string :published_at
t.timestamps
end
end
I think you have to generate a migration. If i understood it right, you added the migration code to the model.
You have to run something like that:
ruby script/generate migration articles
After that open the generated file and add your code there. Hope it helps