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

app/helpers/language_helper.rb

@@ -0,0 +1,2 @@
+module LanguageHelper
+end

app/models/definition.rb

@@ -1,3 +1,4 @@
 class Definition < ApplicationRecord
   belongs_to :word
+  belongs_to :language
 end

app/models/language.rb

@@ -0,0 +1,6 @@
+class Language < ApplicationRecord
+  has_many :definitions
+  has_many :part_of_speeches
+
+  validates_presence_of :name
+end

app/models/part_of_speech.rb

@@ -1,2 +1,3 @@
 class PartOfSpeech < ApplicationRecord
+  belongs_to :language
 end

app/views/languages/_errors.html.erb

@@ -0,0 +1,5 @@
+<% if language.errors.any? %>
+  <% language.errors.full_messages.each do |message| %>
+    <h6><%= message %></h6>
+  <% end %>
+<% end %>

app/views/languages/_form.html.erb

@@ -0,0 +1,6 @@
+<%= form_for language do |f| %>
+  <%= f.label :name %>
+  <%= f.text_field :name %><br/>
+  <br/>
+  <%= f.submit %>
+<% end %>

app/views/languages/create.html.erb

@@ -0,0 +1,2 @@
+<h1>Language#create</h1>
+<p>Find me in app/views/language/create.html.erb</p>

app/views/languages/destroy.html.erb

@@ -0,0 +1,2 @@
+<h1>Language#destroy</h1>
+<p>Find me in app/views/language/destroy.html.erb</p>

app/views/languages/edit.html.erb

@@ -0,0 +1,5 @@
+<%= render "languages/errors", language: @language %>
+
+<h1>Edit Language</h1>
+
+<%= render "languages/form", language: @language %>

app/views/languages/index.html.erb

@@ -0,0 +1,20 @@
+<h1>Languages</h1>
+
+<table>
+<tr>
+  <td><b>Language</b></td>
+</tr>
+<% @languages.each do |language| %>
+  <tr>
+    <td><%= language.name %></td>
+    <td><%= link_to "Edit", edit_language_path(language) %></td>
+    <td> | </td>
+    <td><%= link_to "Delete", language_path(language), data: { turbo_method: :delete,
+                                                               turbo_confirm: "Are you sure?" } %></td>
+  </tr>
+<% end %>
+</table>
+
+<br/>
+<br/>
+<%= link_to "New Language", new_language_path %>

app/views/languages/new.html.erb

@@ -0,0 +1,5 @@
+<%= render "languages/errors", language: @language %>
+
+<h1>New Language</h1>
+
+<%= render "languages/form", language: @language %>

app/views/languages/show.html.erb

@@ -0,0 +1,2 @@
+<h1>Language#show</h1>
+<p>Find me in app/views/language/show.html.erb</p>

app/views/languages/update.html.erb

@@ -0,0 +1,2 @@
+<h1>Language#update</h1>
+<p>Find me in app/views/language/update.html.erb</p>

app/views/layouts/application.html.erb

@@ -15,6 +15,10 @@
       <div class="d-flex mb-3">
         <div class="p-2">
           <%= link_to "Dictionary", dictionary_index_path %>
+          <% if user_signed_in? %>
+            <pre style="display: inline;">|</pre>
+            <%= link_to "Languages", languages_path %>
+          <% end %>
         </div>
         <div class="ms-auto p-2">
           <% if user_signed_in? %>