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, Jun 14 '15 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, Jun 14 '15 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, Jun 14 '15 at 18:50
Please post code of the controller action you are using to create records. — Nitish Parkar, Jun 14 '15 at 18:57
http://stackoverflow.com/questions/25285093/create-multiple-entries-with-checkbox-and-strong-params-in-rails4 — rkamun1, Jun 14 '15 at 18:58
@NitishParkar, i don't know how to save them. I guess i have to traverse params and save them one by one. But also I guess rails should have some smart autosave of multiple objects. — yerassyl, Jun 14 '15 at 19:00

Rokibul Hasan · Accepted Answer · 2015-06-14T19:54:52.383

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 '15 at 19:54

answered Jun 14 '15 at 19:32

Rokibul Hasan

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Looks, like nothing happens. (0.1ms) begin transaction (0.1ms) rollback transaction – yerassyl Jun 14 '15 at 19:38
trace what is return by `map_params`, data format should be as in above example, if not re-write your `def map_params`. – Rokibul Hasan Jun 14 '15 at 19:39
sorry i am a new to rails, how can i trace? – yerassyl Jun 14 '15 at 19:40
past this `puts map_params` before `Map.create(map_params)`, and observer development log. – Rokibul Hasan Jun 14 '15 at 19:42
get my params printed out. – yerassyl Jun 14 '15 at 19:44
whats that ? Past here please. – Rokibul Hasan Jun 14 '15 at 19:48
Let us [continue this discussion in chat](http://chat.stackoverflow.com/rooms/80530/discussion-between-rokibul-hasan-and-yerassyl). – Rokibul Hasan Jun 14 '15 at 19:49
{"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"}]} – yerassyl Jun 14 '15 at 19:49
1

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? – Rokibul Hasan Jun 14 '15 at 19:52
@Rakibul Hasan, yes it worked. Thank you very much. Edit your answer i will accept it. – yerassyl Jun 14 '15 at 19:54

Saving multiple JSON objects in rails

1 Answers1