Hi, I've been programming in RoR for about a week or 2-3, and I like it very much. Now, I have a certain problem that is very complicated, well for me at least :-) I have 3 database tables: recipes ingredients and another one which binds the previous 2 tables together Now, I want to have an input form where you can insert 1 recipe and a certain amount of ingredients, say 5. What do I do now: I put in my _form.rhtml-file a while loop, which generates 5 text_fields for the ingredients and i give them each a name like "ingredient_" + i.to_s Then i can read them out in my create definition in my controller by doing: params["ingredient_" + i.to_s] Ok, first I don't like this kind code, its way to complicated, and I'm also running into problems if I want to edit a recipe... I hope someone knows some better code for this problem... Thanks alot!
on 2006-01-30 15:28
on 2006-01-30 15:46
For your ingredients, instead of params named ingredients_n, do ingredients[n]. Then in your controller code you can do params[:ingredients].each Pat
on 2006-01-30 16:01
If I try that I get this error: NameError in Recipes#new Showing app/views/recipes/_form.rhtml where line #14 raised: `@ingredients' is not allowed as an instance variable name My code is: 12: <% i = 0 %> 13: <% while i < 5 %> 14: <%= text_field 'ingredients[' + i.to_s + ']', 'name' %> 15: <% i += 1 %> 16: <% end %>
on 2006-01-30 17:36
Are you declaring the ingredients array in your controller ? @ingredients = Array.new(5)
on 2006-01-30 18:13
On 1/30/06, Pieter H. <firstname.lastname@example.org> wrote: > 12: <% i = 0 %> > 13: <% while i < 5 %> > 14: <%= text_field 'ingredients[' + i.to_s + ']', 'name' %> > 15: <% i += 1 %> > 16: <% end %> > > -- I prefer to do this with render/partial/collection: new.rhtml <%= render :partial => 'ingredient', :collection => @recipe.ingredients %> _ingredient.rhtml <% @ingredient = ingredient -%> <%= text_field 'ingredient', 'name', :index => ingredient_counter %> # plus whatever other fields you want, and any HTML, etc. The helpers like text_field work in this way: 1. Take the first parameter, and look for an instance variable with the same name. 'ingredient' requires that @ingredient be present. 2. Call a method on that instance variable with the same name as the second parameter. In this case, we're calling @ingredient.name. 3. Wrap that output in the appropriate HTML, and set the name and id properties, etc, etc. Your earlier code didn't work because it was looking for an instance variable called "@ingredients['0']".. which isn't valid or present. The <% @ingredient = ingredient -%> code above is just making the current ingredient (which render :partial, :collection passed in) available as an instance variable; something that the helper methods require. --Wilson.
on 2006-01-30 22:32
Wilson, As a newbie myself, I really enjoyed reading your response. It was very informative. Thanks, William
on 2006-01-30 23:59
Thanks alot guys, you really helped me out here.