{"id":1566,"date":"2006-12-14T01:56:53","date_gmt":"2006-12-13T17:56:53","guid":{"rendered":"http:\/\/ihower.idv.tw\/blog\/archives\/1566"},"modified":"2015-09-05T10:49:04","modified_gmt":"2015-09-05T02:49:04","slug":"rails-restful-crud-constraints-are-liberating","status":"publish","type":"post","link":"https:\/\/ihower.tw\/blog\/1566-rails-restful-crud-constraints-are-liberating","title":{"rendered":"Rails RESTful \u5236\u7d04\u5373\u89e3\u653e"},"content":{"rendered":"

DHH\u7684\u6295\u5f71\u7247<\/a>\u63d0\u5230\u4e00\u500b\u6982\u5ff5:<\/p>\n

Constraints are liberating<\/strong> (a straight jacket for your mind)<\/p>\n

\u9019\u88e1\u6307\u7684 Constraints (\u5236\u7d04) \u662f\u4ec0\u9ebc? \u6211\u60f3\u6307\u7684\u662f Controller \u4e0d\u51fa\u4ee5\u4e0b\u4e03\u7a2e action (\u8a3b)\u00a0:<\/p>\n

<\/p>\n

class PeopleController < ActionController::Base
\n\u00a0# GET \/people
\n\u00a0def index() end
\n\u00a0
\n\u00a0# GET \/people;new
\n\u00a0def new() end
\n\u00a0
\n\u00a0# POST \/people
\n\u00a0def create() end
\n\u00a0
\n\u00a0# GET \/people\/1
\n\u00a0def show() end
\n\u00a0
\n\u00a0# GET \/people\/1;edit
\n\u00a0def edit() end
\n\u00a0
\n\u00a0# PUT \/people\/1
\n\u00a0def update() end
\n\u00a0
\n\u00a0# DELETE \/people\/1
\n\u00a0def destroy() end
\nend\u00a0<\/p><\/blockquote>\n

\u4f8b\u5982\u591a\u5c0d\u591a\u95dc\u4fc2\u3002\u6211\u5011\u4ee5\u5f80\u7fd2\u6163\u628a\u52a0\u5165\u6216\u522a\u9664\u95dc\u806f\u7684\u52d5\u4f5c\u653e\u5728 UsersController\u00a0\u6216 GroupsController \u4e2d\uff0c\u5982\u4ee5\u4e0b\u7684\u7a0b\u5f0f\u78bc :<\/p>\n

<\/blockquote>\n

class Group < ActiveRecord::Base
\n\u00a0has_and_belongs_to_mang :users
\nend<\/p>\n

class User < ActiveRecord::Base
\n\u00a0has_and_belongs_to_mang :groups
\nend<\/p>\n

class GroupsController < ActionController::Base
\n\u00a0# POST \/groups\/1;add_user?user_id=2
\n\u00a0def add_user() end
\n\u00a0
\n\u00a0# POST \/groups\/1;add_user?user_id=2
\n\u00a0def remove_user() end
\nend<\/p>\n

class UsersController < ActionController::Base
\n\u00a0# POST \/users\/1;join_group?group_id=2
\n\u00a0def join_group() end
\n\u00a0
\n\u00a0# POST \/users\/1;leave_group?group_id=2
\n\u00a0def leave_group() end
\nend<\/p><\/blockquote>\n

\u7528\u5236\u7d04\u7684\u60f3\u6cd5\u4e4b\u5f8c\uff0c\u6211\u5011\u5f97\u628a\u52a0\u5165\u6216\u522a\u9664\u95dc\u806f\u7684\u52d5\u4f5c\u7368\u7acb\u51fa\u4f86\u4e86\uff0c\u8b8a\u6210\u9019\u6a23:<\/p>\n

<\/blockquote>\n

class Group < ActiveRecord::Base
\n\u00a0has_many :memberships
\n\u00a0has_many :users, :through => :memberships
\nend<\/p>\n

class User < ActiveRecord::Base
\n\u00a0has_many :memberships
\n\u00a0has_many :groups, :through => :memberships
\nend<\/p>\n

class Membership < ActiveRecord::Base
\n\u00a0belongs_to :group
\n\u00a0belongs_to :user
\nend<\/p>\n

class MembershipsController < ActionController::Base
\n\u00a0# POST \/memberships?group_id=1&user_id=2
\n\u00a0def create() end
\n\u00a0
\n\u00a0# DELETE \/memberships\/3
\n\u00a0def destroy() end\u00a0
\nend<\/p><\/blockquote>\n

\u900f\u904e\u9019\u6a23\u7684\u00a0CRUD \u6280\u6cd5\u4e4b\u5f8c\uff0c\u9664\u4e86\u958b\u767c\u6642\u4f7f\u7528\u7d71\u4e00\u7684\u98a8\u683c\u4f86\u5beb\u7a0b\u5f0f\u67b6\u69cb\u4e4b\u5916\uff0c\u610f\u7fa9\u5728\u65bc \u628a\u5c0d\u7db2\u7ad9\u7684\u6240\u6709\u64cd\u4f5c\u90fd\u8b8a\u6210\u5c0d\u67d0\u500b Resource (\u67d0\u500bURL) \u7684 HTTP\u00a0GET\/POST\/PUT\/DELETE \u64cd\u4f5c (\u8a3b)\u3002<\/strong>\u64b0\u5beb Controller action \u7684\u540c\u6642\u4e5f\u5b8c\u6210\u4e86 Web APIs (\u8a3b)\uff0c\u9664\u4e86\u53ef\u4ee5\u7d66\u4f7f\u7528\u8005\u700f\u89bd\u5668\u4e4b\u5916\uff0c\u6211\u5011\u4e5f\u53ef\u4ee5\u7528 machine client \u5982\u00a0ARes<\/a>\u00a0\u4f86\u64cd\u4f5c\u6574\u500b RESTful \u7db2\u7ad9\u7cfb\u7d71\u7684\u4efb\u4e00\u529f\u80fd\u3002\u9019\u5728\u4ee5\u524d\u5e7e\u4e4e\u662f\u5f88\u82b1\u6642\u9593\u8ddf\u6210\u672c\u7684\u4e8b\u554a : server-side \u8981\u7279\u5730\u6253\u9020 Web Service\uff0cclient-side \u4e5f\u5fc5\u9808\u82b1\u6642\u9593\u5b78\u7fd2\u5982\u4f55\u4f7f\u7528API\uff0c\u73fe\u5728\u53ea\u9700\u8981\u9075\u5faa RESTful \u53ef\u4ee5\u5f9e SOAP and WS-* \u89e3\u653e\u51fa\u4f86… :p<\/p>\n

Constraints are liberating \u5b83\u8b93\u6211\u5011\u66f4\u5c08\u6ce8\u5728\u8981\u505a\u4ec0\u9ebc\u3002<\/p>\n

\u8a3b: \u4f60\u6703\u767c\u73fe Controller \u7684\u9019\u4e03\u500b action \u4e2d\uff0c GET \/people;new \u8ddf GET \/people\/1;edit \u9019\u5169\u500b\u53ea\u9700\u5c0d\u700f\u89bd\u5668\u4f7f\u7528\u8005\u6709\u4f5c\u7528\uff0c\u6240\u4ee5\u6c92\u6709\u63d0\u4f9bXML(\u4e0d\u7b97\u662fWeb APIs)\u3002\u53e6\u5916\u4e94\u500b action\u00a0( GET \/people, GET \/people\/1 \u8ddf POST\/PUT\/DELETE) \u5247\u540c\u6642\u64d4\u4efb\u4e86Web APIs \u8ddf \u56de\u61c9\u700f\u89bd\u5668 \u7684\u529f\u80fd\u3002<\/p>\n

\u53c3\u8003\u8cc7\u6599:<\/p>\n