Usually a form maps to a AR instance (and hence a database row).
Consider the simple example of a Person model in which there is just one attribute “name”. [This is just an example to illustrate the problem]
Now I need a single form that allows multiple people to be added, basically multiple text fields (for “name” attribute) each resulting in a new ActiveRecord object for each person, but a single action and single submit button.
Another example would be multiple image upload from a single form [Flickr]
The way I am thinking of doing this is by having a model “People” that encapsulates many Person objects, on submit the controller method of Person shall iterate over its params and create as many Person objects as required. The People class though a model does not have a database table of its own.
My question : Is there a better way/pattern of doing this?
Here is an example to accomplish what you are trying to do. The 'show'
method starts things rolling. The 'people' table has only 'id' and
'name' columns.
The Model (person.rb):
class Person < ActiveRecord::Base
end
The Controller (person_controller.rb):
class PersonController < ApplicationController
def show
end
def nbrOfNewPeople
3
end
def add_person
nbrOfNewPeople.times do | index |
person = Person.new
personParams = params[('person' + index.to_s).intern]
person.update_attributes(personParams) unless
personParams[:name].empty?
end
end
end
The View (show.rhtml)
<%= form_tag :action=> 'add_person' %>
<% controller.nbrOfNewPeople.times do | i | %>
<label for='<%='person' + i.to_s%>'>Name:</label>
<%= text_field 'person' + i.to_s, 'name' %>
</br>
<% end %>
<%= submit_tag "Add People" %>
<%= end_form_tag %>
Thanks a lot for your responses, I was making it too complex
Just a minor refinement to Paul’s example -
In the form, continue to let the text_field be associated with model
person and let the field be named anything, in this case a number
…
<%= text_field ‘person’ , i.to_s %>
…
In the controller extract the params in a hash
my_params = params[:person]
my_params.each do |p|
param_hash = {:name => p[1]}
@person = Person.new(param_hash)
…
@person.save
end
This allows me to have the controller not know the number of people
that are sent from the form, so form can have a javascript which adds
new text_fields to the form dynamically. [like gmail]
Thanks
