json格式在ruby和rails中的注意事項

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  #虛擬網路拓撲的json資料  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 = SLB/VPC Operations and Maintenance System.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有什麼關係？vnic = Vnic.find(:all, :select => ‘id,virtual_machine_id,vnet_id‘)#把所有的name放入nodes數組中 如：{"name":"vswitch1","type":"vswitch"}nodes = Array.newfor i in 0..vswitch.size-1 do       nodes.push({name: vswitch[i].name.to_s,group: 1 #"vswitch"      })endfor i in 0..vm.size-1 do       nodes.push({name: vm[i].hostname.to_s,group: 2 #"vm"      })endfor i in 0..vmc.size-1 do       nodes.push({name: vmc[i].hostname.to_s,group: 3 #"vmc"      })end#儲存名字和其在nodes中的位置,為了方便edges找到其位置    如：id_hash["vm2"] = 4id_hash = Hash.newfor i in 0..nodes.size-1 do   id_hash[nodes[i][:name]] = i    end#edges儲存邊之間的關係#先儲存vswitch和vm的關係 => vniclinks = Array.newfor 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#再儲存vm和vmc的關係 => vmfor 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 }  #這裡會自動調用to_json    end  #render json: lsjson  #render json: {test: 1}  end

　　

 

ruby關於json格式的調用

首先json格式注意：

  1、在nodes後面要緊跟:，不能有空格

  2、nodes、name這些地方不能用引號括起來，不然不能用ruby轉換為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格式的資料，比如

render json: simple_json 

  (2)或者另一種方法也可以，這裡的@alljson就是類似上面simple_json格式的資料，當然，如果直接是model裡匯出來的資料也可以直接用，比如@vnic = Vnic.all

    respond_to do |format|      format.html      format.json { render json: @alljson }  #這裡會自動調用to_json    end


4、直接存取url   http://localhost:3000/vnet/topodata.json就可以直接得到json資料了

在rubychina上看到如果在url上想不要後面.json就可以看到json資料的話，就要到route裡改resource直接為json資料了， routes裡面對特定的resource加上 format: :json 好像是這樣。

json格式在ruby和rails中的注意事項