ruby on rails - how do I correctly make an active record query from one table to another? -

been stuck on afternoon/evening. appreciate continue work on this.

i have 2 different tables. posts (status , photo) , places (address). i'd combine these (status, photo, address) 1 form , 1 show.

so, think having trouble making active record query interface. however, may have messed in associating tables...

post.rb model

class post < activerecord::base    belongs_to :place   belongs_to :user   has_many :comments   has_many :commenters, through: :comments, source: :user end 

place.rb model

class place < activerecord::base    has_many :posts  end 

posts _form.html.erb

<%= form_for(@post) |f| %>   <% if @post.errors.any? %>     <div id="error_explanation">       <h2><%= pluralize(@post.errors.count, "error") %> prohibited post being saved:</h2>        <ul>       <% @post.errors.full_messages.each |msg| %>         <li><%= msg %></li>       <% end %>       </ul>     </div>   <% end %>    <div class="field">     <%= f.label :status %><br>     <%= f.text_field :status %>   </div>   <div class="field">     <%= f.label :upload %><br>     <%= f.text_field :upload %>   </div>     <%= f.label :place %><br>     <%= f.text_field :place %>   <div class="actions">     <%= f.submit %>   </div> <% end %> 

posts show.html.erb

<h1><%= @post.status %></h1> <p><%= link_to @post.upload, @post.upload %></p> <p><%= @post.place %></p>  <%= form_for [@post, @comment] |f| %>   <p>     <%= f.text_area :response, placeholder: "add comment...", :rows => 8, :cols => 40 %>   </p>   <%= f.submit %> <% end %>  <ul class="comments">   <% @post.comments.each |comment| %>     <li><%= "#{comment.user.try(:email)} posted: #{comment.response}" %></li>   <% end %> </ul>  <p><%= link_to "back home page", root_path %></p> 

posts_controller.rb

class postscontroller < applicationcontroller   before_action :set_post, only: [:show, :edit, :update, :destroy]    # /posts   # /posts.json    def index     @posts = post.all   end    # /posts/1   # /posts/1.json   def show     @post = post.find params[:id]     @comment = comment.new(:post => @post)   end    # /posts/new   def new     @post = post.new   end    # /posts/1/edit   def edit   end       def create     safe_post = params.require(:post).permit(:status, :upload)     @post = current_user.posts.new safe_post     @post.place = place.from_params params[:place]     @post.save     redirect_to @post   end     # patch/put /posts/1   # patch/put /posts/1.json   def update     respond_to |format|       if @post.update(post_params)         format.html { redirect_to @post, notice: 'post updated.' }         format.json { head :no_content }       else         format.html { render action: 'edit' }         format.json { render json: @post.errors, status: :unprocessable_entity }       end     end   end    # delete /posts/1   # delete /posts/1.json   def destroy     @post.destroy     respond_to |format|       format.html { redirect_to posts_url }       format.json { head :no_content }     end   end    private     # use callbacks share common setup or constraints between actions.     def set_post       @post = post.find(params[:id])     end      # never trust parameters scary internet, allow white list through.     def post_params       params.require(:post).permit(:status, :upload)     end end 

places_controller.rb

class placescontroller < applicationcontroller   before_action :set_place, only: [:show, :edit, :update, :destroy]    # /places   # /places.json   def index     @places = place.all   end    # /places/1   # /places/1.json   def show      @place = place.find params[:id]    end    # /places/new   def new     @place = place.new   end    # /places/1/edit   def edit   end    # post /places   # post /places.json   def create     @place = place.new(place_params)      respond_to |format|       if @place.save         format.html { redirect_to @place, notice: 'place created.' }         format.json { render action: 'show', status: :created, location: @place }       else         format.html { render action: 'new' }         format.json { render json: @place.errors, status: :unprocessable_entity }       end     end   end    # patch/put /places/1   # patch/put /places/1.json   def update     respond_to |format|       if @place.update(place_params)         format.html { redirect_to @place, notice: 'place updated.' }         format.json { head :no_content }       else         format.html { render action: 'edit' }         format.json { render json: @place.errors, status: :unprocessable_entity }       end     end   end    # delete /places/1   # delete /places/1.json   def destroy     @place.destroy     respond_to |format|       format.html { redirect_to places_url }       format.json { head :no_content }     end   end    private     # use callbacks share common setup or constraints between actions.     def set_place       @place = place.find(params[:id])     end      # never trust parameters scary internet, allow white list through.     def place_params       params.require(:place).permit(:address, :latitude, :longitude)     end end 

schema.rb

activerecord::schema.define(version: 20140324213459)    create_table "comments", force: true |t|     t.integer  "user_id"     t.integer  "post_id"     t.string   "response"     t.datetime "created_at"     t.datetime "updated_at"   end    add_index "comments", ["post_id"], name: "index_comments_on_post_id"   add_index "comments", ["user_id"], name: "index_comments_on_user_id"    create_table "places", force: true |t|     t.string   "address"     t.float    "latitude"     t.float    "longitude"     t.datetime "created_at"     t.datetime "updated_at"   end    create_table "posts", force: true |t|     t.string   "status"     t.string   "upload"     t.datetime "created_at"     t.datetime "updated_at"     t.integer  "user_id"     t.integer  "place_id"   end    add_index "posts", ["place_id"], name: "index_posts_on_place_id"   add_index "posts", ["user_id"], name: "index_posts_on_user_id"    create_table "users", force: true |t|     t.string   "name"     t.string   "photo"     t.string   "bio"     t.datetime "created_at"     t.datetime "updated_at"     t.string   "email",                  default: "", null: false     t.string   "encrypted_password",     default: "", null: false     t.string   "reset_password_token"     t.datetime "reset_password_sent_at"     t.datetime "remember_created_at"     t.integer  "sign_in_count",          default: 0,  null: false     t.datetime "current_sign_in_at"     t.datetime "last_sign_in_at"     t.string   "current_sign_in_ip"     t.string   "last_sign_in_ip"   end    add_index "users", ["email"], name: "index_users_on_email", unique: true   add_index "users", ["reset_password_token"], name: "index_users_on_reset_password_token", unique: true  end 

routes.rb

dondeapp::application.routes.draw     resources :posts     resources :comments, only: :create     resources :places   end    devise_for :users    root 'posts#index'    end 

you need nested model form, http://railscasts.com/episodes/196-nested-model-form-part-1