问题
Is there any way to 'undo' the effects of a scaffold command in Rails?
回答1:
First, if you have already run the migrations generated by the scaffold command, you have to perform a rollback first.
rake db:rollback
You can create scaffolding using:
rails generate scaffold MyFoo
(or similar), and you can destroy/undo it using
rails destroy scaffold MyFoo
That will delete all the files created by generate, but not any additional changes you may have made manually.
回答2:
Rishav Rastogi is right, and with rails 3.0 or higher its:
rails generate scaffold ...
rails destroy scaffold ...
回答3:
You can undo whatever you did with
rails generate xxx
By
rails destroy xxx
For example this applies generators to migration, scaffold, model...etc
回答4:
If you just want to see the files a generator will create you can pass the generator --pretend or -p option.
回答5:
Best way is :
destroy rake db: rake db:rollback
For Scaffold:
rails destroy scaffold Name_of_script
回答6:
rails d scaffold <scaffoldname>
Also, make sure you undo the migration you made either by rollback or to a particular version.
回答7:
for first time, you can check you database migration if you have generate scaffold. you must destroy them to clean up your database
rake db:rollback
then
rails d scaffold
回答8:
To generate scaffolding :
rails generate scaffold xyz
To revert scaffolding :
rails destroy scaffold xyz
回答9:
Rails destroy name
rake db:rollback
回答10:
For generating scaffold in rails -
rails generate scaffold MODEL_GOES_HERE
For undo scaffold in rails -
rails destroy scaffold MODEL_GOES_HERE
回答11:
you need to roll back migrations too after destroying scaffold too
rails destroy scaffold 'scaffoldname'
rake db:rollback
回答12:
So, Process you should follow to undo scaffolding in rails 4. Run Command as below:
rails d scaffold FooBarrake db:rollbackif you_had_run_rake db:migrateafter creating above scaffold?
That's it!
Cheers!
回答13:
Recommend rollback First ,type in your Terminal.
rake db:rollback
Add destroy scaffold (the 'd' stands for 'destroy')
rails d scaffold name_of_scaffold
Enjoy your code.
回答14:
use this
rails d scaffold MODEL_NAME
rake db:rollback
回答15:
First you will have to do the rake db:rollback for destroy the table
if you have already run rake db:migrate and then you can run
rails d scaffold Model
回答16:
you need to rollback the migrations first by doing rake db:rollback if any And then destroy the scaffold by
rails d scaffold foo
回答17:
Yes, the scaffold itself and all the things that amalgamate it.
The destroy command is the opposite of generate and will undo one. Just pass it the name the same way did with generate and it'll be scrubbed from your project:
rails generate scaffold posts title:string content:text
rails destroy scaffold posts title:string content:text
回答18:
To generate the scaffold:
rails generate scaffold abc
To revert this scaffold:
rails destroy scaffold abc
If you have run the migration for it just rollback
rake db:rollback STEP=1
回答19:
provider another solution based on git
start a new project
rails new project_name
cd project_name
initialize git
git init
git commit -m "initial commit"
create a scaffold
rails g scaffold MyScaffold
rake db:migrate
rollback the scaffold
rake db:rollback
git reset --hard
git clean -f -d
回答20:
rails [option] scaffold scaffold_name
Option
g generate
d destroy
If you do
rails g scaffold myFoo
Then reverse it back using
rails d scaffold MyFoo
回答21:
When we generate scaffold, following files will be created:
Command: rails generate scaffold Game
Files created:
> invoke active_record
> create db/migrate/20160905064128_create_games.rb
> create app/models/game.rb
> invoke test_unit
> create test/models/game_test.rb
> create test/fixtures/games.yml
> invoke resource_route
> route resources :games
> invoke inherited_resources_controller
> create app/controllers/games_controller.rb
> invoke erb
> create app/views/games
> create app/views/games/index.html.erb
> create app/views/games/edit.html.erb
> create app/views/games/show.html.erb
> create app/views/games/new.html.erb
> create app/views/games/_form.html.erb
> invoke test_unit
> create test/controllers/games_controller_test.rb
> invoke helper
> create app/helpers/games_helper.rb
> invoke test_unit
> create test/helpers/games_helper_test.rb
> invoke jbuilder
> create app/views/games/index.json.jbuilder
> create app/views/games/show.json.jbuilder
> invoke assets
> invoke coffee
> create app/assets/javascripts/games.js.coffee
> invoke scss
> create app/assets/stylesheets/games.css.scss
> invoke scss
> create app/assets/stylesheets/scaffolds.css.scss
If we have run the migration after this then we have to rollback the migration first as the deletion of scaffold will remove the migration file too and we will not able to revert that migration.
Incase we have run the migration:
rake db:rollback
and after this we can safely remove the scaffold by this commad.
rails d scaffold Game
This command will remove all the files created by the scaffold in your project.
回答22:
Any time you run rails g, you can reverse it by running rails d (destroy) to remove what you've generated. If you have already run rake db:migrate, you will need to run rake db:rollback before destroying :)
回答23:
Case 1: If you run only this command to generate scaffold -
rails generate scaffold MODEL_NAME FIELD_NAME:DATATYPE
Ex - rails generate scaffold User name:string address:text
but till now you did not run any command for migration like
rake db:migrate
then you should need to run only this command like -
rails destroy scaffold User name:string address:text
Case 2: If you already run(Scaffold and Migration) by below commands like -
rails generate scaffold User name:string address:text
rake db:migrate
Then you should need to run first rollback migration command then destroy scaffold like below -
rake db:rollback
rails destroy scaffold User name:string address:text
So In this manner, we can undo scaffolding. Also we can use d for destroy and g for generate as a shortcut.
回答24:
rails g scaffold MyFoo
for generating and
rails d scaffold MyFoo
for removing
来源：https://stackoverflow.com/questions/963420/undo-scaffolding-in-rails