Saving multiple JSON objects in rails

Question

I have parameters like this:

    Parameters: {
"map"=>[
{"lat"=>"51.088672", "lon"=>"71.396522", "vibration_level"=>"300", "time_sent"=>"07:25:00"}, 
{"lat"=>"51.088672", "lon"=>"71.396453", "vibration_level"=>"300", "time_sent"=>"07:25:01"}, 
{"lat"=>"51.088829", "lon"=>"71.396476", "vibration_level"=>"300", "time_sent"=>"07:25:14"}
]}

and strong params defined:

def map_params
  params.permit( map: [:lat,:lon, :vibration_level, :time_sent])
end

How to save all of my 3 objects in rails controller method. I can do that for 1 object but not for 3.

EDIT: for saving one object I use:

params.require(:map).permit(:lat, :lon, :vibration_level, :time_sent)

But, I guess this wouldn't work for multiple objects.

What's wrong with params.permit( map: [:lat,:lon, :vibration_level, :time_sent])? — Nitish Parkar
– Nitish Parkar, Commented Jun 14, 2015 at 18:28
@NitishParkar, params are permitted, I guess, but how to save them? does rails do it automatically if i call '@'map = Map.new(map_params); map.save — yerassyl
– yerassyl, Commented Jun 14, 2015 at 18:37
Do you want to save them all in a single record or do you want to create 3 map records? — Nitish Parkar
– Nitish Parkar, Commented Jun 14, 2015 at 18:50
Please post code of the controller action you are using to create records. — Nitish Parkar
– Nitish Parkar, Commented Jun 14, 2015 at 18:57

Rokibul Hasan · Accepted Answer · 2015-06-14 19:54:52Z

1

This is the basic way to create multiple record at a time with rails,

  maps = Map.create([
              {"lat"=>"51.088672", "lon"=>"71.396522", vibration_level"=>"300", "time_sent"=>"07:25:00"}, 
              {"lat"=>"51.088672", "lon"=>"71.396453", "vibration_level"=>"300", "time_sent"=>"07:25:01"},
              {"lat"=>"51.088829", "lon"=>"71.396476", "vibration_level"=>"300", "time_sent"=>"07:25:14"}
  ])

You can use your map_params for creating all maps at time as following

maps = Map.create(map_params["map"])

edited Jun 14, 2015 at 19:54

answered Jun 14, 2015 at 19:32

Rokibul Hasan

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10 Comments

yerassyl Over a year ago

Looks, like nothing happens. (0.1ms) begin transaction (0.1ms) rollback transaction

Rokibul Hasan Over a year ago

trace what is return by map_params, data format should be as in above example, if not re-write your def map_params.

yerassyl Over a year ago

sorry i am a new to rails, how can i trace?

Rokibul Hasan Over a year ago

past this puts map_params before Map.create(map_params), and observer development log.

Rokibul Hasan Over a year ago

Can you please print this puts map_params["map"], if it returns

[{"lat"=>"51.088672", "lon"=>"71.396522", "vibration_level"=>"300", "time_sent"=>"07:25:00"}, {"lat"=>"51.088672", "lon"=>"71.396453", "vibration_level"=>"300", "time_sent"=>"07:25:01"}, {"lat"=>"51.088829", "lon"=>"71.396476", "vibration_level"=>"300", "time_sent"=>"07:25:14"}]

then use Map.create(map_params["map"]), let me if works?

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