Updating HABTM records is easy, but why isn’t one_to_many ?

Updating HABTM records is easy, but why isn't one_to_many (has_many and
belongs_to)?

With the collection_select it is easy to update HABTM records, everthing
is taken care of, besides declar-ing the variable for all records in de
related tabel. But updating more than one record from a belongs_to table
seems to need a lot of more coding. Or am I missing something?

You're working too hard.

Models:
class Event < ActiveRecord::Base
  has_many :evtimes
end

The has many lets you get at and manipulate the list of Evtimes from the Event.

class Evtime < ActiveRecord::Base
  belongs_to :event
end

In EventsController.rb
  def edit
    @event = Event.find(params[:id])

       @evtimes = Event.evtimes

  end

  def update
    @event = Event.find(params[:id])

       @event.evtimes << Evtime.find(params[:evtimes])

    if @event.update_attributes(params[:event])
      flash[:notice] = 'Event was successfully updated.'
      redirect_to :action => 'show', :id => @event
    else
      render :action => 'edit'
    end
  end

And in _form.rhtml
<%= error_messages_for 'event' %>

<!--[form:event]-->
<p><label for="event_name">Name</label><br/>
<%= text_field 'event', 'name' %></p>

<p><label for="event_city">City</label><br/>
<%= text_field 'event', 'city' %></p>

<p><label for="event_description">Description</label><br/>
<%= text_field 'event', 'description' %></p>

<br/>
<% for evtime in @evtimes do %>
  Starting :<%= time_select 'evtime', 'starting' %><br/>
  Ending :<%= time_select 'evtime', 'ending' %><br/>
  Action: <%= text_field 'evtime', 'movement'%><br/>
  Notes:<br/> <%= text_area 'evtime', 'notes' %><br/>
<% end %>
<!--[eoform:event]-->

There are better ways to do the view, e.g. using the form_for helper
and using a partial for the Evtimes list, but that's another story.
You also need to handle the fact that you are editing multiple
Evtimes. For that I'd direct you to RailsCasts episodes 73-75
http://railscasts.com/episodes;archive

Who is to say that his Events are one-time only. He wasn't asking
about a domain question.

It would be nice, by the way if you stopped top-posting.

A. Because it makes the conversation hard to follow.

Q. Why shouldn't you top post?