[Rails] Null value in mysql database table.

[Aneez a.]

I want to save four fields(name,latitude,longitude,location) coming from
my android phone to mysql table through ruby. I did the follwing code in
my update file.

def update

      @trackdata_items=Trackdata.new(params[:trackdata_items])

      if @trackdata_items.save

      render :text => '{
          "success":true,
                "info":"ok",
                "data":{
                "tasks":[
                  {"title":"Complete the app"}
                ]
             }
            }'


       else
            render :status => :unprocessable_entity,
           :json => {   :success => false,
                      :info => resource.errors,
                       :data => {} }
    end


  end


But my sql database is updating each time with NULL values. what to do ?

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