class Api::ClientsController < ApplicationController
    skip_before_action :verify_authenticity_token
    def index
        render json: Client.all
    end
    def show
        client = Client.find(params[:id])
        render json: client
    end
    def create
        client = Client.new(client_params)
        if client.save!
            head 200
        else
            head 500
        end
    end
    private
    def client_params
        params.require("client").permit(:name, :email, :password, :password_confirmation)
    end
end

curl -i -H "Accept: application/json" -H "Content-type: application/json" -X POST -d '{"name":"oi", "email":"oi2@gmail.com","password":"123456", "password_confirmation":"123456"}' http://localhost:3000/api/clients

Processing by Api::ClientsController#create as JSON
  Parameters: {"name"=>"oi", "email"=>"oi2@gmail.com", "password"=>"[FILTERED]", "password_confirmation"=>"[FILTERED]", "client"=>{"name"=>"oi", "email"=>"oi2@gmail.com"}}
   (0.1ms)  begin transaction
  ↳ app/controllers/api/clients_controller.rb:12
  Client Exists (0.3ms)  SELECT  1 AS one FROM "clients" WHERE "clients"."email" = ? LIMIT ?  [["email", "oi2@gmail.com"], ["LIMIT", 1]]
  ↳ app/controllers/api/clients_controller.rb:12
   (0.1ms)  rollback transaction
  ↳ app/controllers/api/clients_controller.rb:12
Completed 422 Unprocessable Entity in 7ms (ActiveRecord: 0.4ms)
ActiveRecord::RecordInvalid (Validation failed: Password can't be blank):
app/controllers/api/clients_controller.rb:12:in `create'