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json格式在ruby和rails中的注意事项

  #虚拟网络拓扑的json数据  def topodata    #@vnic = Vnic.all	#flash.now[:notice] = ‘Message sent!‘	#flash.now[:alert] = ‘Message sent!‘	simple_json = {		nodes: [{ name: ‘bob‘, age: "22", awesome: "true" }, { name: ‘bob‘, age: 22, awesome:true }],		links: [{ name: ‘bob‘, age: "22", awesome: "true" }, { name: ‘bob‘, age: 22, awesome:true }]	}	vnet = Vnet.find(:all, :select => ‘id,name,vswitch_id‘)	vm = VirtualMachine.find(:all, :select => ‘id,hostname,virtual_machine_container_id‘)	vmc = VirtualMachineContainer.find(:all, :select => ‘id,hostname‘)    vswitch = Vswitch.find(:all, :select => ‘id,uuid,virtual_machine_container_id,vnet_id,name‘)  #vswitch 和 vmc有什么关系?	vnic = Vnic.find(:all, :select => ‘id,virtual_machine_id,vnet_id‘)	#把所有的name放入nodes数组中 如:{"name":"vswitch1","type":"vswitch"}	nodes = Array.new	for i in 0..vswitch.size-1 do       nodes.push({		name: vswitch[i].name.to_s,		group: 1 #"vswitch"      })	end	for i in 0..vm.size-1 do       nodes.push({		name: vm[i].hostname.to_s,		group: 2 #"vm"      })	end	for i in 0..vmc.size-1 do       nodes.push({		name: vmc[i].hostname.to_s,		group: 3 #"vmc"      })	end	#储存名字和其在nodes中的位置,为了方便edges找到其位置    如:id_hash["vm2"] = 4	id_hash = Hash.new	for i in 0..nodes.size-1 do 	  id_hash[nodes[i][:name]] = i    end	#edges储存边之间的关系	#先储存vswitch和vm的关系 => vnic	links = Array.new	for i in 0..vnic.size-1 do       links.push({		source: id_hash[vm[vnic[i].virtual_machine_id-1].hostname],		target: id_hash[vswitch[vnet[vnic[i].vnet_id-1].vswitch_id-1].name],		value: 10,		des: "vswitch_to_vm"      })	end	#再储存vm和vmc的关系 => vm	for i in 0..vm.size-1 do       links.push({		source: id_hash[vm[i].hostname],		target: id_hash[vmc[vm[i].virtual_machine_container_id-1].hostname],		value: 5,		des: "vm_to_vmc"      })	end	@alljson = {}	@alljson["nodes"] = nodes	@alljson["links"] = links	#flash.now[:alert] = id_hash[vm[2].hostname]	lsjson = {  nodes: [    {name:"Myriel",group:1},    {name:"Napoleon",group:1},    {name:"Mlle.Baptistine",group:2},  ],  links: [    {source:0,target:1,value:1},    {source:1,target:2,value:8},    {source:2,target:1,value:10},  ]}	respond_to do |format|      format.html      format.json { render json: @alljson }  #这里会自动调用to_json    end  #render json: lsjson  #render json: {test: 1}  end

  

 

ruby关于json格式的调用

首先json格式注意:

  1、在nodes后面要紧跟:,不能有空格

  2、nodes、name这些地方不能用引号括起来,不然不能用ruby转换为json格式      

simple_json = {		nodes: [{ name: ‘bob‘, age: "22", awesome: "true" }, { name: ‘bob‘, age: 22, awesome:true }],		links: [{ name: ‘bob‘, age: "22", awesome: "true" }, { name: ‘bob‘, age: 22, awesome:true }]	}

3、(1)可以直接在controller的方法中直接render,就可以得到json格式的数据,比如
render json: simple_json 

(2)或者另一种方法也可以,这里的@alljson就是类似上面simple_json格式的数据,当然,如果直接是model里导出来的数据也可以直接用,比如@vnic = Vnic.all
    respond_to do |format|      format.html      format.json { render json: @alljson }  #这里会自动调用to_json    end


4、直接访问url http://localhost:3000/vnet/topodata.json就可以直接得到json数据了

在rubychina上看到如果在url上想不要后面.json就可以看到json数据的话,就要到route里改resource直接为json数据了, routes里面对特定的resource加上 format: :json 好像是这样。

json格式在ruby和rails中的注意事项