I’m trying to develop a database and tables which have the association
as follows.
Video 1 ----- 0…n Script
So, in ‘script.rb’
class Script < ActiveRecord::Base
belongs_to :video
…
end
and in ‘video.rb’
class Video < ActiveRecord::Base
has_many :scripts
end
Furthermore, in order to refer to the parent (in this case, ‘Video’), I
need to set video_id:integer for Script. Am I correct ?
in the migration file,
#--------
class CreateScripts < ActiveRecord::Migration
def change
create_table :scripts do |t|
t.references :video
t.string :text
...
end
add_index :scripts, :video_id
end
end #---------
My question is: how can I actually associate a new ‘script’ entry with
its parent, ‘video’, in making a new ‘Script’ entry ?
For example, in ‘index.html.erb’ for NewScript page, I tried to put
<td><%= script.video_id %></td>
and in script_controller.rb
@script.video = Video.where(:video_id)
But certainly does not seem to work at all.
Could anyone show me how to set up ‘html.erb’ and ‘controller.rb’ to
associate a new ‘Script’ entry with its parent specifically ?
Furthermore, in order to refer to the parent (in this case, ‘Video’), I
need to set video_id:integer for Script. Am I correct ?
Yes.
how can I actually associate a new ‘script’ entry with
its parent, ‘video’, in making a new ‘Script’ entry ?
For example, in ‘index.html.erb’ for NewScript page, I tried to put
<%= script.video_id %>
I don’t understand. index.html.erb is for showing the list of
something. What’s “NewScript” got to do with it?
You may be on almost the right track though. Assuming you get to
views/scripts/new.html.erb by clicking on something associated with a
video, you can set the new script object’s video_id in the controller,
and add a hidden field to hold it (for submission to create).
@script.video = Video.where(:video_id)
That where-clause isn’t going to work. It’s just saying “where
there’s a valid video_id”. Maybe you mean where :video_id => video.id
(if there is a variable called video), or maybe video_id.
Anyway, more direct would be simply “@script.video_id = video_id”. No
searching needed. Assuming of course that you already have the
video_id.
BTW, do you know the definition of “Where Clause”? It’s a fat guy who
dresses up in a red suit and gives out presents, when the moon is
full.
Rails often is. For example, a while back I was trying to do a simple
timesheet system. Couldn’t figure out how to force the newly entered
entries into the right places. Came up with a hairy and fragile way,
that duplicated a lot of what Rails was doing behind the scenes.
Correct solution? Don’t. Just let Rails do it. No problem. Now I
use essentially the same technique in The Decider
(http://thedecider.herokuapp.com), to let Rails keep track of which
rating in the spreadsheet is for which alternative in which factor.
