Add Language model and LanguageController

app/controllers/languages_controller.rb

@@ -0,0 +1,50 @@
+class LanguagesController < ApplicationController
+
+  def index
+    @languages = Language.all
+  end
+
+  def new
+    @language = Language.new
+  end
+
+  def create
+    @language = Language.new(language_params)
+    if @language.save
+      flash[:notice] = "Language successfully created."
+      redirect_to languages_path
+    else
+      render :new, status: :unprocessable_entity
+    end
+  end
+
+  def edit
+    @language = Language.find_by_id(params[:id])
+  end
+
+  def update
+    @language = Language.find_by_id(params[:id])
+    if @language.update(language_params)
+      flash[:notice] = "Language successfully updated."
+      redirect_to languages_path
+    else
+      render :edit, status: :unprocessable_entity
+    end
+  end
+
+  def destroy
+    @language = Language.find_by_id(params[:id])
+    if @language.destroy
+      flash[:notice] = "Language successfully deleted."
+      redirect_to languages_path
+    else
+      render :index, status: :not_modified
+    end
+  end
+
+  private
+  def language_params 
+    params.require(:language).permit(:name)
+  end
+
+end