On Sunday, 21 July 2013 13:28:38 UTC-4, James Gray wrote: > > Hi all, > > In my controller I am doing the following to populate a nested form for a > has_many through association: > > def new > @specification = Specification.new > > Component.find_each.each do |component| > @specification.component_specifications.build(:component_id => > component.id) > end >
One note on this: I'm not sure what the find_each is getting you here. If there are enough records to make it important to find them in batches, building a new ComponentSpecification for each is going to be a bad idea. The idea being whenever someone creates or edits a form, it will be > populated with all components at that time so that when they save those > components that specification will be associated with the newly created > specification. The problem I am having is I can't work out how to pass > component name to display in my form for the as yet nonexistent > component_specification as it is not accessible through the > ComponentSpecification model. > > My models: > > class Specification < ActiveRecord::Base > attr_accessible :description, :name, :component_specifications_attributes > > validates :name, :presence => true, :uniqueness => true > > has_many :component_specifications > has_many :components, :through => :component_specifications > > accepts_nested_attributes_for :component_specifications, :allow_destroy > => true > end > > > class ComponentSpecification < ActiveRecord::Base > attr_accessible :note, :colour, :brand, :components > > has_many :components > This doesn't match the code you're using above - setting `component_id` isn't going to load this association. Is it possible this should be a belongs_to :component instead? > class Component < ActiveRecord::Base > attr_accessible :description, :name > > belongs_to :component_specifications > Again, I think this is the wrong way round - I'm guessing your intended data model is that one Specification can have many Components, with ComponentSpecifications acting as a join table... --Matt Jones -- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To unsubscribe from this group and stop receiving emails from it, send an email to rubyonrails-talk+unsubscr...@googlegroups.com. To post to this group, send email to rubyonrails-talk@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/rubyonrails-talk/46d84917-ef35-4ed3-8a4f-e278b71c3f49%40googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
