Uninitialized constant Model:: Error with polymorphic relation - ruby-on-rails

Question

I created a polymorphic relation in a book reviewing app that I am writing. My app has the nested models: Piece >> Section >> Subsection >> Subsubsection, and I have created a model which belongs to all of these called KeyConcept, my intention being that each of these can have a key concept. When trying to display the "Show" view of the "Piece" model i get the following error:
NameError in Pieces#show
uninitialized constant Piece::Keyconcept
<h5>Summary: </h5><p><%= simple_format(#piece.summary) %></p>
<br/>
<% #piece.keyconcepts.each do |concept| %>
<li>
<%= link_to concept.definition, r, class: 'section_name' %>
</li>
So the routes.rb file looks like this:
resources :pieces do
resources :sections do
resources :subsections do
resources :subsubsections
end
end
resources :links
end
resources :pieces, :sections, :subsections, :subsubsections do
resources :connections, only: [:index, :new, :edit, :update, :destroy, :create]
resources :keyconcepts, only: [:index, :new, :edit, :update, :destroy, :create, :show]
end
the model.rb files look like this:
in models/concerns/conceptable.rb
module Conceptable
extend ActiveSupport::Concern
included do
has_many :keyconcepts, as: :conceptable
end
end
key_concept.rb
class KeyConcept < ActiveRecord::Base
belongs_to :conceptable, polymorphic: true
end
piece.rb
class Piece < ActiveRecord::Base
include Connectable
include Conceptable
has_many :sections
has_many :subsections, through: :sections
has_many :links
end
I don't know if this is a problem in the controller?
class KeyconceptsController < ApplicationController
include KeyconceptsHelper
def whereami
if params[:piece_id]
#piece = Piece.find(params[:piece_id])
here = #piece
parameter = :piece_id
type = "Piece"
elsif params[:section_id]
#section = ::Section.find(params[:section_id])
#piece = #section.piece_id
here = #section
parameter = :section_id
type = "Section"
elsif params[:subsection_id]
#subsection = Subsection.find(params[:subsection_id])
#section = #subsection.section_id
#piece = Section.find(id=#section).piece_id
here = #subsection
parameter = :subsection_id
type = "Subsection"
elsif params[:subsubsection_id]
#subsubsection = Subsubsection.find(params[:subsubsection_id])
#subsection = #subsubsection.subsection_id
#section = Subsection.find(id=#subsection).section_id
#piece = Section.find(id=#section).piece_id
here = #subsubsection
parameter = :subsubsection_id
type = "Subsubsection"
end
end
def redirect
if type == "Piece"
redirect_to piece_path(#piece)
elsif type == "Section"
redirect_to piece_section_path(#piece, #section)
elsif type == "Subsection"
redirect_to piece_section_subsection_path(#piece, #section, #subsection)
elsif type == "Subsubsection"
redirect_to piece_section_subsection_subsubsection_path(#piece, #section, #subsection, #subsubsection)
end
end
def index
whereami.call
end
def show
whereami.call
r = redirect.call
end
def new
#keyconcept = KeyConcept.new
#keyconcept.conceptable_id = here.id
end
def create
whereami.call
#keyconcept = KeyConcept.new(keyconcept_params)
#keyconcept.conceptable_id = params[parameter]
#keyconcept.conceptable_type = type
#keyconcept.save
redirect.call
end
def destroy
here.destroy
redirect.call
flash.notice = "#{type} '#{here.name}' from '#{#piece.name}' deleted!"
end
def edit
whereami.call
end
def update
whereami.call
here.update(keyconcept_params)
flash.notice = "#{type} '#{here.name}' Updated!"
redirect.call
end
end
I have reloaded the console and I get the same error. I have also tried to do a few things in the console and this: Piece.first.keyconcepts, does not work (i get the same NameError: uninitialized constant Piece::Keyconcept) however this: KeyConcept.first DOES work, i even though i get nil because i havent created any instances yet.
I notice that, in the error message it says Keyconcept and not camelcase KeyConcept. I think this is where the problem lies but I do not have enough experience to understand it.
I would appreciate help in solving this!

Answer 1

The problem here is you are not following proper conventions
Change your model name to Keyconcept and file_name to keyconcept.rb
keyconcept.rb
class Keyconcept < ActiveRecord::Base
belongs_to :conceptable, polymorphic: true
end
OR
You will need to change keyconcepts to key_concepts in the following places:
routes
resources :keyconcepts
controller name
class KeyConceptsController < ApplicationController
...
end
controller file name
key_concepts_controller.rb
strong params
def key_concept_params
params.require(:key_concept).permit(:your, :params)
end
associations
has_many :key_concepts