Live code

app/controllers/house_plants_controller.rb

@@ -2,4 +2,29 @@ class HousePlantsController < ApplicationController
   def index
     @house_plants = HousePlant.all
   end
+
+  def show
+    @house_plant = HousePlant.find(params[:id])
+    @room = @house_plant.room
+  end
+
+  def new
+    @house_plant = HousePlant.new
+  end
+
+  def create
+    @house_plant = HousePlant.new(house_plant_params)
+
+    if @house_plant.save
+      redirect_to house_plant
+    else
+      render :new
+    end
+  end
+
+  private
+
+  def house_plant_params
+    params.require(:house_plant).permit(:plant_type, :height, :room_id)
+  end
 end

app/controllers/rooms_controller.rb

@@ -2,4 +2,9 @@ class RoomsController < ApplicationController
   def index
     @rooms = Room.all
   end
+
+  def show
+    @room = Room.find(params[:id])
+    @house_plants = @room.house_plants
+  end
 end

app/models/house_plant.rb

@@ -1,3 +1,5 @@
 class HousePlant < ApplicationRecord
+  belongs_to :room
 
+  validates :height, numericality: { greater_than_or_equal_to: 1 }
 end

app/models/room.rb

@@ -1,3 +1,3 @@
 class Room < ApplicationRecord
-
+  has_many :house_plants
 end

app/views/house_plants/index.html.erb

@@ -1,7 +1,9 @@
 <h1>House Plants</h1>
 
+<p><%= link_to "Create Plant", new_house_plant_path %></p>
+
 <ol>
   <% @house_plants.each do |plant| %>
-    <li><%= plant.plant_type %></li>
+    <li><%= link_to plant.plant_type, house_plant_path(plant) %></li>
   <% end %>
 </ol>

app/views/house_plants/new.html.erb

@@ -0,0 +1,28 @@
+<% if @house_plant.errors.any? %>
+  <div>
+    <h2>
+      <%= pluralize(@house_plant.errors.count, "error") %>
+      prohibited this plant from being saved:
+    </h2>
+
+    <ul>
+    <% @house_plant.errors.full_messages.each do |msg| %>
+      <li><%= msg %></li>
+    <% end %>
+    </ul>
+  </div>
+<% end %>
+
+<h1>New Plant</h1>
+
+<%= form_with model: @house_plant, local: true do |form| %>
+  <%= form.label :plant_type %>
+  <%= form.text_field :plant_type %>
+
+  <%= form.label :height %>
+  <%= form.text_field :height %>
+
+  <%= form.collection_select :room_id, Room.all, :id, :name %>
+
+  <%= form.submit "Create Plant" %>
+<% end %>

app/views/house_plants/show.html.erb

@@ -0,0 +1,3 @@
+<h1><%= @house_plant.plant_type %></h1>
+<p><%= @house_plant.height %> inches</p>
+<p><%= link_to @room.name, room_path(@room) %></p>

app/views/rooms/index.html.erb

@@ -2,6 +2,6 @@
 
 <ol>
   <% @rooms.each do |room| %>
-    <li><%= room.name %></li>
+    <li><%= link_to room.name, room_path(room) %></li>
   <% end %>
 </ol>

app/views/rooms/show.html.erb

@@ -0,0 +1,9 @@
+<h1><%= @room.name %></h1>
+<p>Occupancy: <%= @room.occupancy %> people</p>
+
+<h2>House Plants</h2>
+<ul>
+  <% @house_plants.each do |plant| %>
+    <li><%= link_to plant.plant_type, plant %></li>
+  <% end %>
+</ul>

config/routes.rb

@@ -1,4 +1,4 @@
 Rails.application.routes.draw do
-  resources :rooms, only: [:index]
-  resources :house_plants, only: [:index]
+  resources :rooms, only: %i[index show]
+  resources :house_plants, except: %i[edit update destroy]
 end

db/migrate/20240822180119_add_room_id_to_house_plants.rb

@@ -0,0 +1,5 @@
+class AddRoomIdToHousePlants < ActiveRecord::Migration[5.2]
+  def change
+    add_reference :house_plants, :room
+  end
+end

db/schema.rb

@@ -0,0 +1,27 @@
+# This file is auto-generated from the current state of the database. Instead
+# of editing this file, please use the migrations feature of Active Record to
+# incrementally modify your database, and then regenerate this schema definition.
+#
+# Note that this schema.rb definition is the authoritative source for your
+# database schema. If you need to create the application database on another
+# system, you should be using db:schema:load, not running all the migrations
+# from scratch. The latter is a flawed and unsustainable approach (the more migrations
+# you'll amass, the slower it'll run and the greater likelihood for issues).
+#
+# It's strongly recommended that you check this file into your version control system.
+
+ActiveRecord::Schema.define(version: 2024_08_22_180119) do
+
+  create_table "house_plants", force: :cascade do |t|
+    t.string "plant_type"
+    t.integer "height"
+    t.integer "room_id"
+    t.index ["room_id"], name: "index_house_plants_on_room_id"
+  end
+
+  create_table "rooms", force: :cascade do |t|
+    t.string "name"
+    t.integer "occupancy"
+  end
+
+end