如何简单快速的完成用户角色管理和权限控制（6）

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如何定制devisedevise 可以帮助你快速构建应用程序，同时也支持定制化。实际上 devise 是一个引擎，它的所有 views 和 controllers                都被打包在 gem 中，你只需要用 generate 命令，这些文件就会自动拷贝到你的项目中。你只需要重写这些文件，就可以实现 devise 的定制化。
另外需要配置 config/initializers/devise.rb。
$ rails generate devise:views users
$ rails generate devise:controllers users
清单8.                generate生成devise文件

1	shirleydembpeveloperWork shirley$ rails generate devise:views users

Running via Spring preloader in process 61411
invoke Devise::Generators::SharedViewsGenerator
create app/views/users/shared
create app/views/users/shared/_links.html.erb
invoke form_for
create app/views/users/confirmations
create app/views/users/confirmations/new.html.erb
create app/views/users/passwords
create app/views/users/passwords/edit.html.erb
create app/views/users/passwords/new.html.erb
create app/views/users/registrations
create app/views/users/registrations/edit.html.erb
create app/views/users/registrations/new.html.erb
create app/views/users/sessions
create app/views/users/sessions/new.html.erb
create app/views/users/unlocks
create app/views/users/unlocks/new.html.erb
invoke erb
create app/views/users/mailer
create app/views/users/mailer/confirmation_instructions.html.erb
create app/views/users/mailer/email_changed.html.erb
create app/views/users/mailer/password_change.html.erb
create app/views/users/mailer/reset_password_instructions.html.erb
create app/views/users/mailer/unlock_instructions.html.erb
清单9. 定制化 views/users/sessions/new.html.erb<h2>Log in Custom</h2>
<%= form_for(resource, as: resource_name, url:                session_path(resource_name)) do |f| %>
<div class="field"
<%= f.label :email %><br />

1	<%= f.email_field :email, :class => "form-control input-sm", :autofocus => true %>

</div>
<div class="field">
<%= f.label :password %><br />
<%= f.password_field :password, :class => "form-control input-sm",                autocomplete: "off" %>
</div>
<% if devise_mapping.rememberable? -%>
<div class="field">
<%= f.check_box :remember_me %>
<%= f.label :remember_me %>
</div>
<% end -%>
<div class="actions">
<%= f.submit "Log in", :class => "btn btn-sm btn-info" %>
</div>
<% end %>
<%= render "users/shared/links" %>
注意，还需要在 config/initializers/devise.rb 中配置 config.scoped_views = true。
图3. 定制化登录页面