Error regarding ActiveAdmin in Ruby on Rails when customizing the menu

Question

Mac OS X 10.7.3 Lion, Ruby 1.9.2, Rails 3.2.2, Sass 3.2.3

Following this tutorial: http://activeadmin.info/documentation.html

Following this video tutorial http://www.youtube.com/watch?v=tAxlrHcEg9U

I add the activeadmin gem, run bundle install, then run rails generate active_admin:install rails generate active_admin:resource POST

Only after creating the app/admin/posts.rb and trying to run either db migrate rails server

fails with the error

uninitialized constant Post NameError

with out that posts.rb file i am able to run the admin interface error free.

I tried moving the sass-rails gem out side of the :assets in my gem file and re-running bundle install as suggested in another question, but to no avail I still have the error

according to the getting started active admin tutorial "Post" is suppose to be a module name so i assume the code above is calling a class method (ActiveAdmin as the class, register as the method) and sending the module as a parameter and the block do end

Regardless the error is implying that RoR doesn't know what Post is. As if it does not exist. Being new to rails i do not know how to navigate well, meaning i do not even know where this ActiveAdmin source file is in order to dig through it for a method Post

Thank you for the consideration and your time, I appreciate it.

Tom Harrison · Accepted Answer · 2012-03-20 18:19:12Z

1

The linked tutorial assumes that you have already created a model named Post (and have run rake db:migrate to link it to the database). The purpose of the rails generate active_admin:resource Post command is to tell ActiveAdmin that you want it to consider the Post model in part of what it does.

Historically, you'll see models like Post and User in Rails a lot -- these are the commonly used examples of creating a blogging application (a user can create blog posts).

So, whatever models you have in your application can be registered with ActiveAdmin by replacing Post with the name of your model.

Another note: while generators like this tend to be forgiving, a Post is a model that is defined in post.rb and is linked to a SQL table called posts. Be careful with things like upper- and lower-case, and singular and plurals. In Rails they all fit together in a special way.

answered Mar 20, 2012 at 18:19

Tom Harrison

14.2k3 gold badges53 silver badges81 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

A'sa Dickens Over a year ago

lol i quit ruby on rails 2 years ago and started up again 3 weeks ago, and this would have fixed my problem back then so i will give you credit for it. Or at least it sounds like an un-migrated model error.

Collectives™ on Stack Overflow

Error regarding ActiveAdmin in Ruby on Rails when customizing the menu

1 Answer 1

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related