Wow, great news! I am very in favor of this patch. When learning Rails, I was surprised that objects couldn't be created from a nested hash. Now with this patch, it will be very useful in complex forms (the problem is well covered in Railscasts Complex Forms series). I will take a closer look at the patch soon.
A big +1 on this and thanks for the patch Hique http://hiquepedia.com On Jul 16, 9:57 pm, Pratik <[EMAIL PROTECTED]> wrote: > Has anyone any strong opinions against this ? I'm very interested in > hearing more thoughts on this and/or if you have any suggestions to > improvise David's approaches. > > Thanks, > Pratik > > On Jul 14, 6:38 pm, David Dollar <[EMAIL PROTECTED]> wrote: > > > Recently the following patch > > >http://github.com/rails/rails/commit/e0750d6a5c7f621e4ca12205137c0b13... > > > was committed to rails trunk. This patch allows for associations to be > > flagged as :accessible => true and then hydrated from nested hashes > > (i.e. nested forms) > > > class Post < ActiveRecord::Base > > belongs_to :author, :accessible => true > > has_many :comments, :accessible => true > > end > > > post = Post.create({ > > :title => 'Accessible Attributes', > > :author => { :name => 'David Dollar' }, > > :comments => [ > > { :body => 'First Post!' }, > > { :body => 'Nested Hashes are great!' } > > ] > > > }) > > > post.comments << { :body => 'Another Comment' } > > > I have done some work on another patch to allow this same mechanism to > > be used for updating existing rows using nested hashes. This completes > > the work as far as dynamically generating forms and being able to > > simply and intuitively push them back into the database. > > >http://github.com/ddollar/rails/commit/14a16844bbb3ba9edb14269ce2d0b6... > > > This allows for the following: > > > # create from a basic hash> p = Post.create(:title => 'Test Post', :author > > => { :name => 'David' }) > > > => #<Post id: 8, author_id: 8, title: "Test Post", created_at: > > "2008-07-14 15:22:53", updated_at: "2008-07-14 15:22:53"> > > > # update a singular reference> p.author = { :name => 'Joe' } > > > => {:name=>"Joe"} > > > # it 'updates' the row in sql, notice the id is still the same> p.author > > > => #<Author id: 8, name: "Joe", created_at: "2008-07-14 15:22:53", > > updated_at: "2008-07-14 15:23:03"> > > > # create an author with posts from a hash> a = Author.create(:name => > > 'David', :posts => [ { :title => 'Post 1' }, { :title => 'Post 2' } ]) > > > => #<Author id: 14, name: "David", created_at: "2008-07-14 15:38:18", > > updated_at: "2008-07-14 15:38:18"> > > > # show the posts> a.posts > > > => [#<Post id: 17, author_id: 14, title: "Post 1", created_at: > > "2008-07-14 15:38:18", updated_at: "2008-07-14 15:38:18">, #<Post id: > > 18, author_id: 14, title: "Post 2", created_at: "2008-07-14 15:38:18", > > updated_at: "2008-07-14 15:38:18">] > > > # use << to update existing entries (as well as add new ones, > > demonstrated later)> a.posts << { :id => 17, :title => 'Post 1 Updated' } > > > => [#<Post id: 17, author_id: 14, title: "Post 1 Updated", created_at: > > "2008-07-14 15:38:18", updated_at: "2008-07-14 15:38:53">, #<Post id: > > 18, author_id: 14, title: "Post 2", created_at: "2008-07-14 15:38:18", > > updated_at: "2008-07-14 15:38:18">] > > > # show posts to verify the update> a.posts > > > => [#<Post id: 17, author_id: 14, title: "Post 1 Updated", created_at: > > "2008-07-14 15:38:18", updated_at: "2008-07-14 15:38:53">, #<Post id: > > 18, author_id: 14, title: "Post 2", created_at: "2008-07-14 15:38:18", > > updated_at: "2008-07-14 15:38:18">] > > > # can't update posts that don't belong to the author> a.posts << { :id => > > 1, :title => 'Not Allowed' } > > > ActiveRecord::RecordNotFound: Couldn't find Post with ID=1 AND > > ("posts".author_id = 14) > > from /Users/ddollar/Code/EdgeRailsApp/vendor/rails/ > > activerecord/lib/active_record/base.rb:1393:in `find_one' > > from /Users/ddollar/Code/EdgeRailsApp/vendor/rails/ > > activerecord/lib/active_record/base.rb:1376:in `find_from_ids' > > from /Users/ddollar/Code/EdgeRailsApp/vendor/rails/ > > activerecord/lib/active_record/base.rb:537:in `find' > > from /Users/ddollar/Code/EdgeRailsApp/vendor/rails/ > > activerecord/lib/active_record/associations/association_collection.rb: > > 47:in `find' > > from /Users/ddollar/Code/EdgeRailsApp/vendor/rails/ > > activerecord/lib/active_record/associations/association_collection.rb: > > 103:in `<<' > > from /Users/ddollar/Code/EdgeRailsApp/vendor/rails/ > > activerecord/lib/active_record/associations/association_collection.rb: > > 99:in `each' > > from /Users/ddollar/Code/EdgeRailsApp/vendor/rails/ > > activerecord/lib/active_record/associations/association_collection.rb: > > 99:in `<<' > > from /Users/ddollar/Code/EdgeRailsApp/vendor/rails/ > > activerecord/lib/active_record/connection_adapters/abstract/ > > database_statements.rb:66:in `transaction' > > from /Users/ddollar/Code/EdgeRailsApp/vendor/rails/ > > activerecord/lib/active_record/transactions.rb:79:in `transaction' > > from /Users/ddollar/Code/EdgeRailsApp/vendor/rails/ > > activerecord/lib/active_record/transactions.rb:98:in `transaction' > > from /Users/ddollar/Code/EdgeRailsApp/vendor/rails/ > > activerecord/lib/active_record/associations/association_collection.rb: > > 98:in `<<' > > from (irb):12 > > > # use = to outright replace all posts> a.posts = [ { :title => 'Replace > > Posts' } ] > > > => [#<Post id: 19, author_id: 14, title: "Replace Posts", created_at: > > "2008-07-14 15:40:30", updated_at: "2008-07-14 15:40:30">] > > > # can even 'replace' using existing posts, the post attributes will be > > updated> a.posts = [ { :id => 19, :title => 'Can Replace This Way Too' } ] > > > => [#<Post id: 19, author_id: 14, title: "Can Replace This Way Too", > > created_at: "2008-07-14 15:40:30", updated_at: "2008-07-14 15:40:49">] > > > # use << also for adding brand new items> a.posts << { :title => 'New Post' > > } > > > => [#<Post id: 19, author_id: 14, title: "Replace Posts", created_at: > > "2008-07-14 > > > The patch can be found at > > >http://rails.lighthouseapp.com/projects/8994-ruby-on-rails/tickets/61... > > > I was asked to submit this patch to the mailing list and solicit any > > comments. Does anyone see any obvious holes or ways this functionality > > should change? > > > Thanks, > > David Dollar --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on Rails: Core" group. To post to this group, send email to rubyonrails-core@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/rubyonrails-core?hl=en -~----------~----~----~----~------~----~------~--~---
