Passing json object to db as 'payload' -rails postgrel

Question

I have been working on something using the gojs library, which is a library that ables you to generate diagrams, from tournament brackets to family trees etc..

I'm using a save function to submit my set of data to my model via formData,

function save() {
      var tojs = myDiagram.model.toJSON();
      var json = JSON.stringify(tojs);

      var formData = new FormData();
      formData.append("payload", json);

  var request = new XMLHttpRequest();
  request.open("post", "http://localhost:3000/malesingle", true);
  request.send(formData);
                }

My controller as a set of action following the parsing of payload into params. def create

   @tournoi = Tournoi.new(payload: JSON.parse(params[:payload]))
      if @tournoi.save
        redirect_to  malesingle_url

I even used serialize to avoid any trouble while passing the object into tthe model :

class Tournoi < ApplicationRecord
  serialize :payload, JSON
end

my model is set-up in a way to accept a json object into the data as 'payload', thanks to postgrel on rails.

class CreateTournois < ActiveRecord::Migration[5.1]
  def change
    create_table :tournois do |t|
      t.json 'payload'
      t.timestamps
    end
  end
end

After saviing the tournoi, the following action is suppose to be a redirection to another view if @tournoi.save redirect_to malesingle_url The json object is passed throu the parameters as payload it is inserted into tournois table then committed into the data-base. i get a TypeError (no implicit conversion of nil into String): app/controllers/tournois_controller.rb:7:in create after clicking on save button, my browser show me an action controller exception with a ** no implicit conversion of nil into string ** highlighting @tournoi = Tournoi.new(payload: JSON.parse(params[:payload]))

while inspecting my page i console on my javascript console a warning Use of Mutation Events is deprecated. Use MutationObserver instead. i went online to look a bit around to understand why im getting this message they all mention dom modification, which what i'm tryiing to do by assigning a json object to data, what i dont uderstand is on my terminal it shows that my object is saved but i get an error. just doesnt really make any sense to me .

Did either of these work? request.send(JSON.stringify(tojs)) or if it doesn't map automatically request.send({payload: JSON.stringify(tojs)}) — Nope
– Nope, Commented Apr 25, 2018 at 14:35
@Nope i get a TypeError on request.send(JSON.stringify(tojs)) and a syntaxerror on request.send({payload: JSON.stringify(tojs)}) and nothing inserted into my db — Dezz H
– Dezz H, Commented Apr 25, 2018 at 15:13

Dezz H · Accepted Answer · 2018-05-02 16:59:06Z

0

An error is always raised when using @tournoi = Tournoi.new(payload: JSON.parse(params[:payload])), The TypeError is raised specifically on JSON.parse(params[:payload]). So by just modifying the method create :

def create
      if @tournoi = Tournoi.new(payload: params['payload'])
          @tournoi.save
.......

Not parsing the params will save the payload but it will save another tournoi that has a payload nil

all i need to do is add a validation in my model to avoid a tournoi that has a nil payload to be saved :

class Tournoi < ApplicationRecord
  validates :payload, presence: true, allow_nil: false

Thats it gets the job done :)

answered May 2, 2018 at 16:59

Dezz H

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