Ruby on Rails

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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