Rails How to run rails generate scaffold when the model already exists

Question

I m new to Rails so my current project is in a weird state    One of the first things I generated was a  Movie  model  I then started defining it in more detail  added a few methods  etc   I now realize I should have generated it with rails generate scaffold to hook up things like the routing  views  controller  etc    I tried to generate the scaffolding but I got an error saying a migration file with the same name already exists   What s the best way for me to create scaffolding for my  Movie  now   using rails 3

User · Answer

For the ones starting a rails app with existing database there is a cool gem called schema_to_scaffold to generate a scaffold script. it outputs:

rails g scaffold users fname:string lname:string bdate:date email:string encrypted_password:string

from your schema.rb our your renamed schema.rb. Check it

User · Answer

This command should do the trick     rails g scaffold movie --skip

User · Answer

I had this challenge when working on a Rails 6 API application in Ubuntu 20 04  I had already existing models  and I needed to generate corresponding controllers for the models and also add their allowed attributes in the controller params  Here s how I did it  I used the rails generate scaffold controller to get it done  I simply ran the following commands  rails generate scaffold controller School name string logo json motto text address text  rails generate scaffold controller Program name string logo json school references  This generated the corresponding controllers for the models and also added their allowed attributes in the controller params  including the foreign key attributes  create  app controllers schools controller rb invoke  test unit create    test controllers schools controller test rb  create  app controllers programs controller rb invoke  test unit create    test controllers programs controller test rb  That s all  I hope this helps

User · Answer

Great answer by Lee Jarvis  this is just the command e g  we already have an existing model called User   rails g scaffold controller User

User · Answer

TL DR  rails g scaffold controller  lt name gt   Even though you already have a model  you can still generate the necessary controller and migration files by using the rails generate option  If you run rails generate -h you can see all of the options available to you   Rails    controller   generator   helper   integration test   mailer   migration   model   observer   performance test   plugin   resource   scaffold   scaffold controller   session migration   stylesheets   If you d like to generate a controller scaffold for your model  see scaffold controller  Just for clarity  here s the description on that      Stubs out a scaffolded controller and its views  Pass the model name        either CamelCased or under scored  and a list of views as arguments        The controller name is retrieved as a pluralized version of the model       name       To create a controller within a module  specify the model name as a       path like  parent module controller name        This generates a controller class in app controllers and invokes helper        template engine and test framework generators    To create your resource  you d use the resource generator  and to create a migration  you can also see the migration generator  see  there s a pattern to all of this madness   These provide options to create the missing files to build a resource  Alternatively you can just run rails generate scaffold with the --skip option to skip any files which exist     I recommend spending some time looking at  the options inside of the generators  They re something I don t feel are documented extremely well in books and such  but they re very handy

User · Answer

In Rails 5  you can still run    rails generate scaffold movie --skip   to create all the missing scaffold files or   rails generate scaffold controller Movie   to create the controller and view only    For a better explanation check out rails scaffold

User · Answer

You can make use of scaffold controller and remember to pass the attributes of the model  or scaffold will be generated without the attributes   rails g scaffold controller User name email   or rails g scaffold controller User name string email string   This command will generate following files   create  app controllers users controller rb invoke  haml create    app views users create    app views users index html haml create    app views users edit html haml create    app views users show html haml create    app views users new html haml create    app views users  form html haml invoke  test unit create    test controllers users controller test rb invoke  helper create    app helpers users helper rb invoke    test unit invoke  jbuilder create    app views users index json jbuilder create    app views users show json jbuilder

[ruby-on-rails] Rails: How to run `rails generate scaffold` when the model already exists?

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