Add problem type

app/assets/javascripts/problems.js.coffee

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+# Place all the behaviors and hooks related to the matching controller here.
+# All this logic will automatically be available in application.js.
+# You can use CoffeeScript in this file: http://coffeescript.org/

app/assets/stylesheets/problems.css.scss

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+// Place all the styles related to the Problems controller here.
+// They will automatically be included in application.css.
+// You can use Sass (SCSS) here: http://sass-lang.com/

app/assets/stylesheets/scaffolds.css.scss

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+body {
+  background-color: #fff;
+  color: #333;
+  font-family: verdana, arial, helvetica, sans-serif;
+  font-size: 13px;
+  line-height: 18px;
+}
+
+p, ol, ul, td {
+  font-family: verdana, arial, helvetica, sans-serif;
+  font-size: 13px;
+  line-height: 18px;
+}
+
+pre {
+  background-color: #eee;
+  padding: 10px;
+  font-size: 11px;
+}
+
+a {
+  color: #000;
+  &:visited {
+    color: #666;
+  }
+  &:hover {
+    color: #fff;
+    background-color: #000;
+  }
+}
+
+div {
+  &.field, &.actions {
+    margin-bottom: 10px;
+  }
+}
+
+#notice {
+  color: green;
+}
+
+.field_with_errors {
+  padding: 2px;
+  background-color: red;
+  display: table;
+}
+
+#error_explanation {
+  width: 450px;
+  border: 2px solid red;
+  padding: 7px;
+  padding-bottom: 0;
+  margin-bottom: 20px;
+  background-color: #f0f0f0;
+  h2 {
+    text-align: left;
+    font-weight: bold;
+    padding: 5px 5px 5px 15px;
+    font-size: 12px;
+    margin: -7px;
+    margin-bottom: 0px;
+    background-color: #c00;
+    color: #fff;
+  }
+  ul li {
+    font-size: 12px;
+    list-style: square;
+  }
+}

app/controllers/problems_controller.rb

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+class ProblemsController < ApplicationController
+  before_action :set_problem, only: [:show, :edit, :update, :destroy]
+
+  # GET /problems
+  # GET /problems.json
+  def index
+    @problems = Problem.all
+  end
+
+  # GET /problems/1
+  # GET /problems/1.json
+  def show
+  end
+
+  # GET /problems/new
+  def new
+    @problem = Problem.new
+  end
+
+  # GET /problems/1/edit
+  def edit
+  end
+
+  # POST /problems
+  # POST /problems.json
+  def create
+    @problem = Problem.new(problem_params)
+
+    respond_to do |format|
+      if @problem.save
+        format.html { redirect_to @problem, notice: 'Problem was successfully created.' }
+        format.json { render :show, status: :created, location: @problem }
+      else
+        format.html { render :new }
+        format.json { render json: @problem.errors, status: :unprocessable_entity }
+      end
+    end
+  end
+
+  # PATCH/PUT /problems/1
+  # PATCH/PUT /problems/1.json
+  def update
+    respond_to do |format|
+      if @problem.update(problem_params)
+        format.html { redirect_to @problem, notice: 'Problem was successfully updated.' }
+        format.json { render :show, status: :ok, location: @problem }
+      else
+        format.html { render :edit }
+        format.json { render json: @problem.errors, status: :unprocessable_entity }
+      end
+    end
+  end
+
+  # DELETE /problems/1
+  # DELETE /problems/1.json
+  def destroy
+    @problem.destroy
+    respond_to do |format|
+      format.html { redirect_to problems_url, notice: 'Problem was successfully destroyed.' }
+      format.json { head :no_content }
+    end
+  end
+
+  private
+    # Use callbacks to share common setup or constraints between actions.
+    def set_problem
+      @problem = Problem.find(params[:id])
+    end
+
+    # Never trust parameters from the scary internet, only allow the white list through.
+    def problem_params
+      params.require(:problem).permit(:title, :content)
+    end
+end

app/helpers/problems_helper.rb

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+module ProblemsHelper
+end

app/models/problem.rb

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+class Problem < ActiveRecord::Base
+end

app/views/problems/_form.html.erb

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+<%= form_for(@problem) do |f| %>
+  <% if @problem.errors.any? %>
+    <div id="error_explanation">
+      <h2><%= pluralize(@problem.errors.count, "error") %> prohibited this problem from being saved:</h2>
+
+      <ul>
+      <% @problem.errors.full_messages.each do |message| %>
+        <li><%= message %></li>
+      <% end %>
+      </ul>
+    </div>
+  <% end %>
+
+  <div class="field">
+    <%= f.label :title %><br>
+    <%= f.text_field :title %>
+  </div>
+  <div class="field">
+    <%= f.label :content %><br>
+    <%= f.text_area :content %>
+  </div>
+  <div class="actions">
+    <%= f.submit %>
+  </div>
+<% end %>

app/views/problems/edit.html.erb

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+<h1>Editing problem</h1>
+
+<%= render 'form' %>
+
+<%= link_to 'Show', @problem %> |
+<%= link_to 'Back', problems_path %>

app/views/problems/index.html.erb

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+<h1>Listing problems</h1>
+
+<table>
+  <thead>
+    <tr>
+      <th>Title</th>
+      <th>Content</th>
+      <th colspan="3"></th>
+    </tr>
+  </thead>
+
+  <tbody>
+    <% @problems.each do |problem| %>
+      <tr>
+        <td><%= problem.title %></td>
+        <td><%= problem.content %></td>
+        <td><%= link_to 'Show', problem %></td>
+        <td><%= link_to 'Edit', edit_problem_path(problem) %></td>
+        <td><%= link_to 'Destroy', problem, method: :delete, data: { confirm: 'Are you sure?' } %></td>
+      </tr>
+    <% end %>
+  </tbody>
+</table>
+
+<br>
+
+<%= link_to 'New Problem', new_problem_path %>

app/views/problems/index.json.jbuilder

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+json.array!(@problems) do |problem|
+  json.extract! problem, :id, :title, :content
+  json.url problem_url(problem, format: :json)
+end

app/views/problems/new.html.erb

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+<h1>New problem</h1>
+
+<%= render 'form' %>
+
+<%= link_to 'Back', problems_path %>

app/views/problems/show.html.erb

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+<p id="notice"><%= notice %></p>
+
+<p>
+  <strong>Title:</strong>
+  <%= @problem.title %>
+</p>
+
+<p>
+  <strong>Content:</strong>
+  <%= @problem.content %>
+</p>
+
+<%= link_to 'Edit', edit_problem_path(@problem) %> |
+<%= link_to 'Back', problems_path %>

app/views/problems/show.json.jbuilder

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+json.extract! @problem, :id, :title, :content, :created_at, :updated_at