Add problem type

app/controllers/problems_controller.rb

@@ -0,0 +1,74 @@
+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