常用GEM的使用方法

1. kaminari 分頁(yè)系統(tǒng)

1.1

gem 'kaminari'

bundle

rails g kaminari:config

rails g kaminari:views default/bootstrap3

1.2

lists_controller.rb

defindex@lists=List.all.order(created_at::desc).page(params[:page]).per(5)end

1.3

<%= paginate @lists %>

1.4

en:? hello: "Hello world"? views:? ? pagination:? ? ? first: "首頁(yè)"? ? ? last: "末頁(yè)"? ? ? previous: "上一頁(yè)"? ? ? next: "下一頁(yè)"? ? ? truncate: "..."

2. devise 用戶登陸注冊(cè)系統(tǒng)

2.1

gem devise

bundle

rails g devise:install

rails g devise User

rails g devise:views

3. cancancan

3.1

gem 'cancancan'

bundle

rails g cancan:ability

ability.rbifuser.admin?can:manage,:allelseend

4. redcarpet 文本支持 markdown

gem 'redcarpet'

bundle

接下來(lái)，打開(kāi)app/helper/application_helper.rb， 添加下列代碼。defmarkdown(text)options={:autolink=>true,:space_after_headers=>true,:fenced_code_blocks=>true,:no_intra_emphasis=>true,:hard_wrap=>true,:strikethrough=>true}markdown=Redcarpet::Markdown.new(HTMLwithCodeRay,options)markdown.render(h(text)).html_safeendclassHTMLwithCodeRay<Redcarpet::Render::HTMLdefblock_code(code,language)CodeRay.scan(code,language).div(:tab_width=>2)endend

5. carrierwave 圖片上傳

gem 'carrierwave', '0.6.2'

gem 'mini_magick' #不使用rmagick，占內(nèi)存

bundle

rails g migration add_avatar_to_users avatar:string

rake db:migrate

rails generate uploader Avatar [將會(huì)生成文件app/uploaders/avatar_uploader.rb]

mount_uploader :avatar, AvatarUploader [為user的model user.rb添加如下代碼，使表之間關(guān)聯(lián)]

修改app/uploaders/avatar_uploader.rb

如何在表單中上傳<%=form_for(@user)do|f|%><divclass="field">? ? <%= f.file_field :avatar %>

? ? <%= f.hidden_field :avatar_cache %>

? </div>...

如何顯示圖片<%=image_tag(@user.avatar_url(:large))if@user.avatar%>[這里的:large就是指定圖片的版本為large64x64大小]

6. bootstrap-sass

gem 'bootstrap-sass'

bundle

往 assets 里的 css 和 js 添加 引用

重新 rails s

7. simple_form

gem 'simple_form'

bundle

rails g simple_form:install