This works :
class Recipe < ActiveRecord::Base
belongs_to :category
end
But (when I add validation) this does not work :
class Recipe < ActiveRecord::Base
belongs_to :category
validates_length_of :category, :within => 6..20
validates_uniqueness_of :category, :message => "already exists"
end
thank you
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On 3/28/06, mlotfi <majidnakit@yahoo.com> wrote:> > > This works : > > class Recipe < ActiveRecord::Base > belongs_to :category > end > > But (when I add validation) this does not work : > > class Recipe < ActiveRecord::Base > belongs_to :category > validates_length_of :category, :within => 6..20 > validates_uniqueness_of :category, :message => "already exists" > end > > thank you:category is not a database attribute. Validations occur only on database attributes, so use :category_id. -- Rick Olson http://techno-weenie.net
mlotfi wrote:> This works : > > class Recipe < ActiveRecord::Base > belongs_to :category > end > > But (when I add validation) this does not work : > > class Recipe < ActiveRecord::Base > belongs_to :category > validates_length_of :category, :within => 6..20 > validates_uniqueness_of :category, :message => "already exists" > endYou need the category validations in the Category model, not in the Recipe model. If you want to validate that there is a valid category for a Recipe you are creating, you want something like validates_associated :category, :message => "no such category" -- Ray
title is an attribute of the table recipes.
here is what I have :
class Recipe < ActiveRecord::Base
belongs_to :category
validates_length_of :title, :within => 6..20
validates_uniqueness_of :title, :message => "already exists"
end
But when I try to add a new recipe I get this error :
NoMethodError in Recipe#create
Showing app/views/recipe/new.rhtml where line #17 raised:
You have a nil object when you didn''t expect it!
You might have expected an instance of Array.
The error occured while evaluating nil.each
Extracted source (around line #17):
14: <p>
15: Category:<br/>
16: <select name="recipe[category_id]">
17: <% @categories.each do |category| %>
18: <option value="<%= category.id %>">
19: <%= category.name %>
20: </option>
RAILS_ROOT: ./script/../config/..
Application Trace | Framework Trace | Full Trace
#{RAILS_ROOT}/app/views/recipe/new.rhtml:17
#{RAILS_ROOT}/app/controllers/recipe_controller.rb:11:in `create''
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That means that @categories is nil. Did you set it in the controller? On 3/29/06, mlotfi <majidnakit@yahoo.com> wrote:> > title is an attribute of the table recipes. > here is what I have : > > class Recipe < ActiveRecord::Base > belongs_to :category > validates_length_of :title, :within => 6..20 > validates_uniqueness_of :title, :message => "already exists" > end > > But when I try to add a new recipe I get this error : > > NoMethodError in Recipe#create > Showing app/views/recipe/new.rhtml where line #17 raised: > > You have a nil object when you didn''t expect it! > You might have expected an instance of Array. > The error occured while evaluating nil.each > > Extracted source (around line #17): > > 14: <p> > 15: Category:<br/> > 16: <select name="recipe[category_id]"> > 17: <% @categories.each do |category| %> > 18: <option value="<%= category.id %>"> > 19: <%= category.name %> > 20: </option> > > > > RAILS_ROOT: ./script/../config/.. > > Application Trace | Framework Trace | Full Trace > #{RAILS_ROOT}/app/views/recipe/new.rhtml:17 > #{RAILS_ROOT}/app/controllers/recipe_controller.rb:11:in `create'' > > > -- > View this message in context: http://www.nabble.com/why-belongs_to-does-not-like-validation--t1360119.html#a3649548 > Sent from the RubyOnRails Users forum at Nabble.com. > > _______________________________________________ > Rails mailing list > Rails@lists.rubyonrails.org > http://lists.rubyonrails.org/mailman/listinfo/rails >
Also, you could use the form helper collection_select to create that select menu: <%= collection_select ''recipe'', ''category_id'', @categories, ''id'', ''name'' %> On 3/29/06, Carl-Johan Kihlbom <kihlbom@gmail.com> wrote:> That means that @categories is nil. Did you set it in the controller? > > On 3/29/06, mlotfi <majidnakit@yahoo.com> wrote: > > > > title is an attribute of the table recipes. > > here is what I have : > > > > class Recipe < ActiveRecord::Base > > belongs_to :category > > validates_length_of :title, :within => 6..20 > > validates_uniqueness_of :title, :message => "already exists" > > end > > > > But when I try to add a new recipe I get this error : > > > > NoMethodError in Recipe#create > > Showing app/views/recipe/new.rhtml where line #17 raised: > > > > You have a nil object when you didn''t expect it! > > You might have expected an instance of Array. > > The error occured while evaluating nil.each > > > > Extracted source (around line #17): > > > > 14: <p> > > 15: Category:<br/> > > 16: <select name="recipe[category_id]"> > > 17: <% @categories.each do |category| %> > > 18: <option value="<%= category.id %>"> > > 19: <%= category.name %> > > 20: </option> > > > > > > > > RAILS_ROOT: ./script/../config/.. > > > > Application Trace | Framework Trace | Full Trace > > #{RAILS_ROOT}/app/views/recipe/new.rhtml:17 > > #{RAILS_ROOT}/app/controllers/recipe_controller.rb:11:in `create'' > > > > > > -- > > View this message in context: http://www.nabble.com/why-belongs_to-does-not-like-validation--t1360119.html#a3649548 > > Sent from the RubyOnRails Users forum at Nabble.com. > > > > _______________________________________________ > > Rails mailing list > > Rails@lists.rubyonrails.org > > http://lists.rubyonrails.org/mailman/listinfo/rails > > >
yes I did, in recipe_controller.rb :
class RecipeController < ApplicationController
layout "standard-layout"
scaffold:recipe
def create
@recipe = Recipe.new(@params[''recipe''])
@recipe.date = Date.today
if @recipe.save
redirect_to :action => ''list''
else
render_action ''new''
end
end
def new
@recipe = Recipe.new
@categories = Category.find_all
end
def list
@category = @params[''category'']
@recipes = Recipe.find_all
end
def edit
@recipe = Recipe.find(@params["id"])
@categories = Category.find_all
end
def delete
Recipe.find(@params[''id'']).destroy
redirect_to :action => ''list''
end
end
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mlotfi wrote:> yes I did, in recipe_controller.rb : > def edit > @recipe = Recipe.find(@params["id"]) > @categories = Category.find_all > endAnd you have some independent means of knowing that Category.find_all returned some results?
I am sorry I did not understand your question. I am just doing what in the cookbook tutorial, as I said before without validation everything worked fine. -- View this message in context: http://www.nabble.com/why-belongs_to-does-not-like-validation--t1360119.html#a3654728 Sent from the RubyOnRails Users forum at Nabble.com.
mlotfi wrote:> I am sorry I did not understand your question. > I am just doing what in the cookbook tutorial, as I said before without > validation everything worked fine.Are there any categories in the Category table?
the table is called categories it has an id and name columns. -- View this message in context: http://www.nabble.com/why-belongs_to-does-not-like-validation--t1360119.html#a3655016 Sent from the RubyOnRails Users forum at Nabble.com.
mlotfi wrote:> the table is called categories it has an id and name columns.Are there any rows in the table? If there are no rows then the Catgories.find_all in your statement: @categories = Categories.find_all will return nil. -- Ray