辛纳屈 + 机架路由

Question

我有一个看起来像这样的应用程序文件ws_app.rb：

require 'rubygems'
require 'sinatra'
require 'sinatra/respond_to'
require 'dm-core'
require 'dm-migrations'
require 'dm-timestamps'
require 'json'
require 'csv'
load 'models/Battery.rb'
Sinatra::Application.register Sinatra::RespondTo
DataMapper::setup(:default,"sqlite3://#{Dir.pwd}/mpt_hmi.sqlite3")
class MPTHMI  < Sinatra::Base
    load 'controller/BatteryController.rb'
end

模块/Battery.rb 看起来像这样：

class Battery
   include DataMapper::Resource
   property :id, Serial
   property :i_battery_manager_id, Integer
   property :c_battery_number, String
   property :c_battery_state, String
   property :c_voltage_byte, String
   property :i_voltage_int, Integer
   property :i_temperature, Integer
   property :i_resistance, Integer
   property :i_capacity, Integer
   property :i_cell_balancing_duration, Integer
   property :i_total_cell_balancing_duration, Integer
   property :i_age, Integer
   property :i_time_to_service, Integer
   property :created_at, DateTime
   property :updated_at, DateTime
   def to_my_json
     {
      :i_battery_manager_id => self.i_battery_manager_id,
      :c_battery_number => self.c_battery_number,
      :c_battery_state => self.c_battery_state,
      :c_voltage_byte => self.c_voltage_byte,
      :i_voltage_int => self.i_voltage_int,
      :i_temperature => self.i_temperature,
      :i_resistance => self.i_resistance,
      :i_capacity => self.i_capacity,
      :i_cell_balancing_duration => self.i_cell_balancing_duration,
      :i_total_cell_balancing_duration => self.i_total_cell_balancing_duration,
      :i_age => self.i_age,
      :i_time_to_service => self.i_time_to_service
     }
  end
end 

控制器

/电池控制器.rb 文件如下所示：

get '/battery/:id' do 
   @battery = Battery.get(params[:id])
   respond_to do |wants|
     wants.html { erb :battery } # html
     wants.json { @battery.to_my_json.to_s } # json
   end
end
get '/batteries' do 
  @batteries = Battery.all
  respond_to do |wants|
    wants.html { erb :batteries } # html
    wants.json { 
      @batteries.all.inject({}) { |hsh, obj| 
        hsh[obj.id] = obj.to_my_json
        hsh
      }.to_json
    } 
  end
end

当我正常运行 Sinatra 时，这非常有效，如下所示：

$ ruby ws_app.rb
== Sinatra/1.3.2 has taken the stage on 4567 for development with backup from Thin
>> Thin web server (v1.3.1 codename Triple Espresso)
>> Maximum connections set to 1024
>> Listening on 0.0.0.0:4567, CTRL+C to stop

然后去这里：

http://0.0.0.0:4567/battery/5.json

我

得到了我期待的 JSON：

{:i_battery_manager_id=>1, :c_battery_number=>"5", :c_battery_state=>"3", :c_voltage_byte=>"145", :i_voltage_int=>191, :i_temperature=>107, :i_resistance=>81, :i_capacity=>228, :i_cell_balancing_duration=>127, :i_total_cell_balancing_duration=>37, :i_age=>111, :i_time_to_service=>211}

但我需要在切诺基 Web 服务器上部署它，所以我想为此制作一个机架 config.ru 文件......

所以我有一个文件 mpthmiws.rb 它包含

load 'ws_app.rb'
MPTHMI.run

以及一个包含 config.ru 的文件

load 'mpthmiws.rb'
run MPTHMI.new

当我跑步时

$ rackup config.ru 
>> Thin web server (v1.3.1 codename Triple Espresso)
>> Maximum connections set to 1024
>> Listening on 0.0.0.0:9292, CTRL+C to stop

然后去这里：

http://0.0.0.0:9292/battery/1.json

但后来我得到了著名的，"辛纳屈不知道这个小曲 - 尝试让'/battery/1.json'做"Hello World"结束

如果我从控制器/电池控制器.rb 文件中获取第一条路由并将其放入 ws_app.rb 文件中的 HMIMPT 类中，如下所示：

require 'rubygems'
require 'sinatra'
require 'sinatra/respond_to'
require 'dm-core'
require 'dm-migrations'
require 'dm-timestamps'
require 'json'
require 'csv'
load 'models/Battery.rb'
Sinatra::Application.register Sinatra::RespondTo
DataMapper::setup(:default,"sqlite3://#{Dir.pwd}/mpt_hmi.sqlite3")
class MPTHMI  < Sinatra::Base
   get '/battery/:id' do 
     @battery = Battery.get(params[:id])
     respond_to do |wants|
       wants.html { erb :battery } # html
       wants.json { @battery.to_my_json.to_s } # json
     end
  end
end

我收到此错误：

undefined method `respond_to' for #<MPTHMI:0x00000001240a80>

我该如何解决这个问题？谢谢

Answer 1

首先，mpthmiws.rb 和 config.ru 的事情过于复杂。删除 mpthmiws.rb 并使用此 config.ru 与rackup config.ru一起使用：

require './ws_app'
run MPTHMI

如果要使用普通旧ruby ws_app.rb运行应用程序，请使用此 run.rb 文件：

require './ws_app'
MPTHMI.run!

这就引出了下一点：永远不要使用load！它执行加载文件中的代码，但不引入任何定义的变量、函数等。请改用require！在这里，您必须在路径前面加上 ./ 或将./添加到 $LOAD_PATH ，但反过来您可以省略.rb扩展名。

接下来是您的 BatteryController.rb 文件。它应该看起来像这样：需要"Sinatra/respond_to"

class BatteryController < Sinatra::Base
  register Sinatra::RespondTo
  get '/battery/:id' do 
     # ...
  end
  get '/batteries' do 
    # ...
  end
end

这也是你register扩展的地方——在你需要它的类中。

现在我们了解了load的工作原理，您可能已经注意到，您实际上并没有将get块加载到MPTHMI类中，而是在类外部执行它们。这就是您的应用程序无论如何都可以使用普通旧ruby ws_app.rb的唯一原因！

您可以将控制器正确包含在具有use的类中：

# require all your gems
# ...
require './models/Battery'
require './controller/BatteryController'
DataMapper::setup(:default,"sqlite3://#{Dir.pwd}/mpt_hmi.sqlite3")
class MPTHMI < Sinatra::Base
    use BatteryController
end

您也可以在此处省略register。如果您有其他问题，请随时发表评论！

---

这是完整的差异：

diff --git a/config.ru b/config.ru
index eaa15fe..1568544 100644
--- a/config.ru
+++ b/config.ru
@@ -1,3 +1,3 @@
-load 'mpthmiws.rb'
+require './ws_app'
-run MPTHMI.new
+run MPTHMI
diff --git a/controller/BatteryController.rb b/controller/BatteryController.rb
index 31e4910..c500c48 100644
--- a/controller/BatteryController.rb
+++ b/controller/BatteryController.rb
@@ -1,20 +1,27 @@
-get '/battery/:id' do 
-   @battery = Battery.get(params[:id])
-   respond_to do |wants|
-     wants.html { erb :battery } # html
-     wants.json { @battery.to_my_json.to_s } # json
-   end
-end
+require 'sinatra/respond_to'
-get '/batteries' do 
-  @batteries = Battery.all
-  respond_to do |wants|
-    wants.html { erb :batteries } # html
-    wants.json { 
-      @batteries.all.inject({}) { |hsh, obj| 
-        hsh[obj.id] = obj.to_my_json
-        hsh
-      }.to_json
-    } 
+class BatteryController < Sinatra::Base
+  register Sinatra::RespondTo
+  
+  get '/battery/:id' do 
+     @battery = Battery.get(params[:id])
+     respond_to do |wants|
+       wants.html { erb :battery } # html
+       wants.json { @battery.to_my_json.to_s } # json
+     end
   end
-end
+
+  get '/batteries' do 
+    @batteries = Battery.all
+    respond_to do |wants|
+      wants.html { erb :batteries } # html
+      wants.json { 
+        @batteries.all.inject({}) { |hsh, obj| 
+          hsh[obj.id] = obj.to_my_json
+          hsh
+        }.to_json
+      } 
+    end
+  end
+
+end
 No newline at end of file
diff --git a/mpt_hmi.sqlite3 b/mpt_hmi.sqlite3
index e69de29..9897cd9 100644
Binary files a/mpt_hmi.sqlite3 and b/mpt_hmi.sqlite3 differ
diff --git a/mpthmiws.rb b/mpthmiws.rb
deleted file mode 100644
index 87f3406..0000000
--- a/mpthmiws.rb
+++ /dev/null
@@ -1,3 +0,0 @@
-load 'ws_app.rb'
-
-MPTHMI.run
diff --git a/ws_app.rb b/ws_app.rb
index 1cab867..4a6e332 100644
--- a/ws_app.rb
+++ b/ws_app.rb
@@ -1,19 +1,18 @@
 require 'rubygems'
 require 'sinatra'
-require 'sinatra/respond_to'
 require 'dm-core'
 require 'dm-migrations'
 require 'dm-timestamps'
 require 'json'
 require 'csv'
-load 'models/Battery.rb'
+require './models/Battery'
+require './controller/BatteryController'
-Sinatra::Application.register Sinatra::RespondTo
 DataMapper::setup(:default,"sqlite3://#{Dir.pwd}/mpt_hmi.sqlite3")
 class MPTHMI  < Sinatra::Base
-
-    load 'controller/BatteryController.rb'
+    
+    use BatteryController
 end