I am attempting to tie a Project to Projectparts to Parts and I
believe the relationship should be one-to-many, then many-to-one. My
goal is to build the Parts table so that this table can grow and the
Parts descriptions can be re-used in different Projects (ultimately
tie this in to an autocomplete plug-in so the user doesn't have to re-
type a part every time, but I'm not there yet). I had the application
working through to the Project - Projectparts relationship, I am now
trying to add the description component from the Part table.
I think I've tracked down my problem to the _projectpart partial of
code that I've implemented for this. Here's the partial:
<%= f.text_field :qty, :size => 3 %>
<% f.fields_for :parts do |builder| %> # <======I think
problem is here.
<%= builder.text_field :description, :size => 50 %>
<% end %>
<%= remove_child_link "Delete", f %>
As the code is now, the 'New' view will render, but when I save the
data from the UI, I get an unknown attribute error in my 'Create':
ActiveRecord::UnknownAttributeError in ProjectsController#create
unknown attribute: parts
However, when I change the :parts reference to :part, the New screen
will not render & I get a nil object error:
NoMethodError in Projects#new
Showing app/views/projects/_projectpart.html.erb where line #10
You have a nil object when you didn't expect it!
You might have expected an instance of ActiveRecord::Base.
The error occurred while evaluating nil.new_record?
So I'm thinking I'm not referencing this correctly. I've tried using
@project.projectpart.description, @project.projectpart & other
variations, but not sure if the model is set up correctly in the first
place (the description is the 'one' at the end of the one-to-many /
Any thoughts? Thanks in advance.