Rails Undefined Method - NoMethodError -

i vaguely following http://guides.rubyonrails.org/getting_started.html, part 6.

using rails v 4.1.8 sqlite db

i error after adding second model:

nomethoderror in pages#show

showing m:/ict/rails/salacity/app/views/pages/show.html.erb line

24 raised:

undefined method `links' #

extracted source (around line #24)

links

<% @page.links.each |link| %>

id: <%= link.child__id %>

rails.root: m:/ict/rails/salacity application trace | framework trace | full trace

app/views/pages/show.html.erb:24:in `_app_views_pages_show_html_erb___283878207_51684456'

this app/views/pages/show.html.erb

<p id="notice"><%= notice %></p>  <p>   <strong>page:</strong>   <%= @page.page_id %> </p>  <p>     <strong>body:</strong>     <%= @page.body %> </p>  <p>     <strong>branch:</strong>     <%= @page.branch_id %> </p>  <p>     <strong>location:</strong>     <%= @page.location_id %> </p>  <h2>links</h2> <% @page.links.each |link| %>     <p>         <strong>id:</strong>         <%= link.child__id %>     </p>      <p>         <strong>body:</strong>         <%= link.body %>     </p> <% end %>  <h2>add link:</h2> <%= form_for([@page, @page.links.build]) |f| %>     <p>         <%= f.label :page_id %><br>         <%= f.text_field :page_id %>     </p>     <p>         <%= f.label :child_id %><br>         <%= f.text_area :child_id %>     </p>     <p>         <%= f.label :order %><br>         <%= f.number_field :order %>     </p>     <p>         <%= f.label :body %><br>         <%= f.text_area :body %>     </p>     <p>         <%= f.submit %>     </p> <% end %>   <%= link_to 'edit', edit_page_path(@page) %> | <%= link_to 'back', pages_path %> 

pagescontroller

class pagescontroller < applicationcontroller   before_action :set_page, only: [:show, :edit, :update, :destroy]    # /pages   # /pages.json   def index     @pages = page.all   end    # /pages/1   # /pages/1.json   def show     @page = page.find(show_params)   end    # /pages/new   def new     @page = page.new   end    # /pages/1/edit   def edit     @page = page.find(params[:id])   end    # post /pages   # post /pages.json   def create     @page = page.new(page_params)      respond_to |format|       if @page.save         format.html { redirect_to @page, notice: 'page created.' }         format.json { render :show, status: :created, location: @page }       else         format.html { render :new }         format.json { render json: @page.errors, status: :unprocessable_entity }       end     end   end    # patch/put /pages/1   # patch/put /pages/1.json   def update     respond_to |format|       if @page.update(page_params)         format.html { redirect_to @page, notice: 'page updated.' }         format.json { render :show, status: :ok, location: @page }       else         format.html { render :edit }         format.json { render json: @page.errors, status: :unprocessable_entity }       end     end   end    # delete /pages/1   # delete /pages/1.json   def destroy     @page = page.find(params[:id])     @page.destroy      respond_to |format|      format.html { redirect_to pages_url, notice: 'page destroyed.' }      format.json { head :no_content }     end   end    private     # use callbacks share common setup or constraints between actions.     def set_page       @page = page.find(params[:id])     end      # never trust parameters scary internet, allow white list through.     def page_params       params.require(:page).permit(:page_id, :body, :branch_id, :location_id)     end      def show_params       params.require(:id)     end end 

linkscontroller

class linkscontroller < applicationcontroller   before_action :set_link, only: [:show, :edit, :update, :destroy]    # /links   # /links.json   def index     @links = link.all   end    # /links/1   # /links/1.json   def show   end    # /links/new   def new     @link = link.new   end    # /links/1/edit   def edit   end    # post /links   # post /links.json =begin   def create     @link = link.new(link_params)      respond_to |format|       if @link.save         format.html { redirect_to @link, notice: 'link created.' }         format.json { render :show, status: :created, location: @link }       else         format.html { render :new }         format.json { render json: @link.errors, status: :unprocessable_entity }       end     end   end =end   def create     @page = page.find(params[:page_id])     @link = @page.links.create(link_params)     redirect_to page_path(@page)   end     # patch/put /links/1   # patch/put /links/1.json   def update     respond_to |format|       if @link.update(link_params)         format.html { redirect_to @link, notice: 'link updated.' }         format.json { render :show, status: :ok, location: @link }       else         format.html { render :edit }         format.json { render json: @link.errors, status: :unprocessable_entity }       end     end   end    # delete /links/1   # delete /links/1.json   def destroy     @link.destroy     respond_to |format|       format.html { redirect_to links_url, notice: 'link destroyed.' }       format.json { head :no_content }     end   end    private     # use callbacks share common setup or constraints between actions.     def set_link       @link = link.find(params[:id])     end      # never trust parameters scary internet, allow white list through.     def link_params       params.require(:link).permit(:page_id, :child_id, :order, :body)     end end 

class page has_many :links , class link belongs_to :page migrations links table exists in db not sure else look!

thanks in advance

edit: error

activerecord::statementinvalid in pages#show

showing m:/ict/rails/salacity/app/views/pages/show.html.erb line

24 raised:

sqlite3::sqlexception: no such column: links.page_id: select "links".* "links" "links"."page_id" = ?

extracted source (around line #24):

links

<% @page.links.each |link| %>

id: <%= link.child__id %>

rails.root: m:/ict/rails/salacity application trace | framework trace | full trace

app/views/pages/show.html.erb:24:in `_app_views_pages_show_html_erb___283878207_50250936'

db/migrate/create_links.rb

class createlinks < activerecord::migration   def change     create_table :links |t|       t.text :page_id       t.text :child_id       t.integer :order       t.text :body       t.references :page, foreign_key: true, index: true        t.timestamps     end   end end 

and schema.rb

# encoding: utf-8 # file auto-generated current state of database. instead # of editing file, please use migrations feature of active record # incrementally modify database, , regenerate schema definition. # # note schema.rb definition authoritative source # database schema. if need create application database on # system, should using db:schema:load, not running migrations # scratch. latter flawed , unsustainable approach (the more migrations # you'll amass, slower it'll run , greater likelihood issues). # # it's recommended check file version control system.  activerecord::schema.define(version: 20150707195306)  # not dump table "branches" because of following nomethoderror #   undefined method `[]' nil:nilclass  # not dump table "keywords" because of following nomethoderror #   undefined method `[]' nil:nilclass  # not dump table "links" because of following nomethoderror #   undefined method `[]' nil:nilclass  # not dump table "locations" because of following nomethoderror #   undefined method `[]' nil:nilclass  # not dump table "pages" because of following nomethoderror #   undefined method `[]' nil:nilclass  end 

change migration file this

db/migrate/timestamp_create_links.rb

class createlinks < activerecord::migration   def change     create_table :links |t|       t.integer :child_id       t.integer :order       t.text :body       t.references :page, index: true        t.timestamps     end   end end