Tuesday, September 2, 2014
I think what you might have missed is that rails generate only creates a migration file --- it doesn't actually put the instructions to do the migration into them migration file. It also doesn't' make any changes to your Model or View files (as you said).
look in db/migrate/ for a file that recently got created (it will have a timestamp like 20140902..... and part of its name will be "add_column_to_table")
If I'm right, when you open that file, you'll see empty up and down methods.
You'll want to add to the up method
add_column :users, :filename, :string
and to the down method
remove_column :users, :filename
(I just made up "users" since you didn't specify what model this is)
Once you do that, run rake db:migrate (be sure to do rake db:migrate RAILS_ENV=test for your test environment) and also stop & restart your webserver too!
-Jason
On Aug 31, 2014, at 1:18 PM, Balamurali Krishna <lists@ruby-forum.com> wrote:
I am trying to learn Ruby on Rails, so this may be a pretty basic
question.
I have added new columns to an existing table using
'rails generate migration add_column_to_table' command.
I don't see any change in model & view due to this.
So, I changed the all the views (like _form.html.erb & index.html.erb)
to include a new form element like:
<%= f.label :filename %><br>
<%= f.text_field :filename %>
where :filename was the new column.
When I run the rails, while the new column comes on UI, it doesn't get
saved into db. I think the binding between View and Model is missing.
Is there a way to add a new column in the table to all layers
(view/controller/model etc) apart from the db.
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