railsのライブラリ追加ルールを考えてみる。

■ライブラリファイルを作成

引数に2を加えて返すだけの関数を追加

Ruby

# ---- cpro01\lib\search_index.rb ----

def pu(d)
  return(d + 2)
end

■ライブラリ初期化用ファイルの作成

初期化時に上記ライブラリファイルを読み込むextensions.rbを作成

Ruby

# ---- cpro01\config\initializers\extensions.rb ----

require 'search_index.rb'

■Controllerで関数呼び出し

Ruby

# ---- cpro01\app\controllers\books_controller.rb ----

class BooksController < ApplicationController
  # GET /books
  # GET /books.xml
  def index
    @books = Book.all

    respond_to do |format|
      format.html # index.html.erb
      format.xml  { render :xml => @books }
    end
  end

  # GET /books/1
  # GET /books/1.xml
  def show
    @book = Book.find(params[:id])

    respond_to do |format|
      format.html # show.html.erb
      format.xml  { render :xml => @book }
    end
  end

  # GET /books/new
  # GET /books/new.xml
  def new
    @book = Book.new

    respond_to do |format|
      format.html # new.html.erb
      format.xml  { render :xml => @book }
    end
  end

  # GET /books/1/edit
  def edit
    @book = Book.find(params[:id])
  end

  # POST /books
  # POST /books.xml
  def create
    @book = Book.new(params[:book])

    respond_to do |format|
      if @book.save
        flash[:notice] = 'Book was successfully created.'
        format.html { redirect_to(@book) }
        format.xml  { render :xml => @book, :status => :created, :location => @book }
      else
        format.html { render :action => "new" }
        format.xml  { render :xml => @book.errors, :status => :unprocessable_entity }
      end
    end
  end

  # PUT /books/1
  # PUT /books/1.xml
  def update
    @book = Book.find(params[:id])

    respond_to do |format|
      if @book.update_attributes(params[:book])
        flash[:notice] = 'Book was successfully updated.'
        format.html { redirect_to(@book) }
        format.xml  { head :ok }
      else
        format.html { render :action => "edit" }
        format.xml  { render :xml => @book.errors, :status => :unprocessable_entity }
      end
    end
  end

  # DELETE /books/1
  # DELETE /books/1.xml
  def destroy
    @book = Book.find(params[:id])
    @book.destroy

    respond_to do |format|
      format.html { redirect_to(books_url) }
      format.xml  { head :ok }
    end
  end

  def search
    @searchck = {"Books" => false, "DVD" => false, "Music" => false, "Software" => false, "VideoGames" => false}
    @sortck = {"salesrank" => false, "releasedate" => false, "titlerank" => false, "-titlerank" => false}

    @keyword = params[:keyword]
    @search_index = params[:search_index]
    @sort = params[:sort]

    #デフォルトチェック用
    @searchck["#{@search_index}"] = true
    @sortck["#{@sort}"] = true

    #本だけはソート用のキーが他の物と違うため変更
    @sort = "daterank" if @search_index == "Books" && @sort == "releasedate"

    #検索
    res = Amazon::Ecs.item_search(@keyword, {
      :search_index => @search_index,
      :response_group => 'Medium',
      :sort => @sort
    })
    @items = []
    res.items.each do |item|
      @items << Item.new(
        item.get('asin'),
        item.get('itemattributes/title'),
        item.get('detailpageurl'),
        item.get_hash('smallimage'),
        item.get('author')
      )
    end

    @testp = pu(5)
  end

end

▲追加したのは、最後の”@testp = pu(5)”のみ

■Viewファイルに追加・確認

@testpを表示してみる。

Ruby

<% # ---- cpro01\app\views\books\search.html.erb ---- %>
<%= h @testp %>
<p>検索結果</p>
<% if @items && @items.size > 0 %>
<table>
  <% @items.each do |item| %>

  <tr>
    <td><%= item.title %><br />
        <% if item.image != nil %>
          <%= link_to(image_tag(item.image[:url], :size => "#{item.image[:width]}x#{item.image[:height]}", :alt => item.title), item.url, :target => '_blank') %>
        <% end %><br />
        <%= item.asin %><br />
        <%= item.author %>
      <% form_tag :controller => "maps", :action => "show" do %>
          <%= hidden_field_tag("asin", item.asin) %>
          <%= hidden_field_tag("address", "新宿") %>
          <%= submit_tag("この本の地図データを登録") %>
      <% end %>
    </td>
  </tr>
  <% end %>
<% end %>
</table>

▲2行目を追加

検索結果の上に”7”が表示される事を確認。