How do I get rid of undefined method `to_sym' for nil:NilClass error when deleting rows in rails? - ruby

Question

My project is at this github: https://github.com/hoolahoop/RoR_Projects.
I have a project which has Users, Events, and a join table between the two tables. An event is owned by a user, with a foreign key on the event table. The join table allows many users to be guests for many events.
I'm trying to let owners of events add and delete multiple guests at a time.
Below is the controller action code that throws the error when deleting rows from the join table. Ctrl + f "error thrown here" to see where the error is thrown.
def create
Rails.logger.event.debug("===New Create===\n")
#user_check = true;
##event = Event.new(event_params)
#event = Event.new(event_user_params)
#users = User.new
#event.users.each do |user|
user.password = SecureRandom.base64
user.password_confirmation = user.password
#test all saves here
if(!user.try(:save))
user_check = false;
end
end
Rails.logger.event.debug("Can we save all users: #{#user_check}. If true, continue.")
if(#user_check)
#add all saves here
#add all associations here
#event.users.each do |user|
#user_in_database = User.find_by email: user.email
Rails.logger.event.debug("User in database check. Id: #{#user_in_database.id}. Email: #{#user_in_database.email}.")
if (#user_in_database.nil?) # if user is not in the database (unique email check)
# create a new user
User.transaction do
user.save
end
Rails.logger.event.debug("User id check: #{#user}")
#event_user = EventUser.new(user_id: user.id, event_id: params[:event_id])
# create a new join table record
EventUser.transaction do
#event_user.save
end
else
#event_user_join = EventUser.find_by user_id: #user_in_database.id, event_id: params[:event_id]
Rails.logger.event.debug("Is there a join on this event for this user?. Join object: #{#event_user_join}. If this is nil, no join exists.")
if (#event_user_join.nil?)
#event_user = EventUser.new(user_id: #user_in_database.id, event_id: params[:event_id])
EventUser.transaction do
#event_user.save
end
else
Rails.logger.event.debug("Join user_id: #{#event_user_join.user_id}. Join event_id: #{#event_user_join.event_id}.")
Rails.logger.event.debug("Try removing join.")
EventUser.transaction do
#event_user_join.delete
end
Rails.logger.event.debug("Removal success.")
end
end
end
Rails.logger.event.debug("===Redirect to Event Guests Page===\n")
redirect_to event_display_path(params[:event_id])
else
render 'new'
Rails.logger.event.debug("===Render New===\n")
end
end
private
def event_user_params
#params.require(:user).permit(:first_name, :last_name, :email)
params.require(:event).permit(users_attributes: [:id, :first_name, :last_name, :email, :_destroy])
end
def random_password
random_pass = SecureRandom.base64
end
Models:
class User < ApplicationRecord
# Include default devise modules. Others available are:
# :confirmable, :lockable, :timeoutable and :omniauthable
devise :database_authenticatable, :registerable,
:recoverable, :rememberable, :trackable, :validatable
has_many :event_users
has_many :events, through: :event_users
#validation code...
end
class EventUser < ApplicationRecord
belongs_to :event
belongs_to :user
end
class Event < ApplicationRecord
#belongs_to :user
belongs_to :owner, class_name: "User", foreign_key: :user_id
has_many :event_users
has_many :users, through: :event_users
accepts_nested_attributes_for :users
#validation code...
end
Migrations:
class DeviseCreateUsers < ActiveRecord::Migration[5.1]
def change
create_table :users do |t|
## Database authenticatable
t.string :email, null: false, default: ""
t.string :encrypted_password, null: false, default: ""
## Recoverable
t.string :reset_password_token
t.datetime :reset_password_sent_at
## Rememberable
t.datetime :remember_created_at
## Trackable
t.integer :sign_in_count, default: 0, null: false
t.datetime :current_sign_in_at
t.datetime :last_sign_in_at
t.string :current_sign_in_ip
t.string :last_sign_in_ip
t.timestamps null: false
end
add_index :users, :email, unique: true
add_index :users, :reset_password_token, unique: true
end
end
class AddNamesToUsers < ActiveRecord::Migration[5.1]
def change
add_column :users, :first_name, :string, null: false, default: ""
add_column :users, :last_name, :string, null: false, default: ""
end
end
class CreateEvents < ActiveRecord::Migration[5.1]
def change
create_table :events do |t|
t.string :name, null: false, default: ""
t.text :description, null: true
t.integer :option, null: false, default: 1
t.string :street_address, null: true
t.integer :apartment_number, null: true
t.string :city, null: true
t.date :date, null: true
t.time :time, null: true
t.string :password, null: false, default: ""
t.references :user, foreign_key: true
end
end
end
class CreateJoinTableEventUser < ActiveRecord::Migration[5.1]
def change
create_join_table :events, :users do |t|
t.index [:event_id, :user_id]
t.index [:user_id, :event_id]
end
end
end
class RenameTableEventsUsers < ActiveRecord::Migration[5.1]
def change
rename_table :events_users, :event_users
end
end
Full error in command prompt:
app/controllers/users_controller.rb:21:in `create'
Started POST "/events/16/users" for 127.0.0.1 at 2018-03-05 10:06:40 -0500
Processing by UsersController#create as HTML
Parameters: {"utf8"=>"√", "authenticity_token"=>"ph5zsZQ0HhHt2NAsCtGFDUo/+PmlrQmKyeXt6dcQMnnXFVoEgeh4Srp+p0z0C8mtOhF6Uf48suCw+2YO72+bzw==", "event"=
{"users_attributes"=>{"0"=>{"first_name"=>"Test1", "last_name"=>"Test11", "email"=>"test1#test.com", "_destroy"=>"false", "id"=>"8"}, "1"=>{"first_na
me"=>"Test4", "last_name"=>"Test44", "email"=>"test4#test.com", "_destroy"=>"false", "id"=>"11"}, "2"=>{"first_name"=>"Test5", "last_name"=>"Test55",
"email"=>"test5#test.com", "_destroy"=>"false", "id"=>"12"}}}, "commit"=>"Save", "event_id"=>"16"}
Unpermitted parameter: :id
Unpermitted parameter: :id
Unpermitted parameter: :id
(0.0ms) begin transaction
User Exists (0.0ms) SELECT 1 AS one FROM "users" WHERE "users"."email" = ? LIMIT ? [["email", "test1#test.com"], ["LIMIT", 1]]
(0.0ms) rollback transaction
(0.0ms) begin transaction
User Exists (0.0ms) SELECT 1 AS one FROM "users" WHERE "users"."email" = ? LIMIT ? [["email", "test4#test.com"], ["LIMIT", 1]]
(0.0ms) rollback transaction
(0.0ms) begin transaction
User Exists (0.0ms) SELECT 1 AS one FROM "users" WHERE "users"."email" = ? LIMIT ? [["email", "test5#test.com"], ["LIMIT", 1]]
(0.0ms) rollback transaction
User Load (0.0ms) SELECT "users".* FROM "users" WHERE "users"."email" = ? LIMIT ? [["email", "test1#test.com"], ["LIMIT", 1]]
EventUser Load (0.0ms) SELECT "event_users".* FROM "event_users" WHERE "event_users"."user_id" = ? AND "event_users"."event_id" = ? LIMIT ? [["us
er_id", 8], ["event_id", 16], ["LIMIT", 1]]
(0.0ms) begin transaction
(0.0ms) rollback transaction
Completed 401 Unauthorized in 441ms (ActiveRecord: 2.0ms)
NoMethodError (undefined method `to_sym' for nil:NilClass):
app/controllers/users_controller.rb:56:in block (2 levels) in create'
app/controllers/users_controller.rb:54:inblock in create'
app/controllers/users_controller.rb:34:in `create'
Full error on browser
NoMethodError in UsersController#create
undefined method `to_sym' for nil:NilClass
Extracted source (around line #65):
63
64
65
66
67
68
Rails.logger.event.debug("Try removing join.")
EventUser.transaction do
#event_user_join.delete
end
Rails.logger.event.debug("Removal success.")
end
Rails.root: D:/Development/RoR_Projects/Maestro/blog
Application Trace | Framework Trace | Full Trace
app/controllers/users_controller.rb:65:in block (2 levels) in create'
app/controllers/users_controller.rb:64:inblock in create'
app/controllers/users_controller.rb:39:in `create'
Request
Parameters:
{"utf8"=>"✓","authenticity_token"=>"HfCo+U+X7DtWUrCn/O2KFEkioGtXyut99NEsjUL08DBs+4FMWkuKYAH0x8cCN8a0OQwiwwxbUBeNz6dqeotZhg==",
"event"=>
{"id"=>"16",
"owner"=>"5",
"users_attributes"=>
{"0"=>{"first_name"=>"Test1", "last_name"=>"Test11", "email"=>"test1#test.com", "_destroy"=>"false", "id"=>"8"},
"1"=>{"first_name"=>"Test4", "last_name"=>"Test44", "email"=>"test4#test.com", "_destroy"=>"false", "id"=>"11"},
"2"=>{"first_name"=>"Test5", "last_name"=>"Test55", "email"=>"test5#test.com", "_destroy"=>"false", "id"=>"12"}}},
"commit"=>"Save",
"event_id"=>"16"}
Version information:
OS: Windows 7 Professional Service Pack 1
Ruby -v: ruby 2.4.3p205 (2017-12-14 revision 61247) [x64-mingw32]
Rails -v: Rails 5.1.4
Libraries: please check gemfile.
Related lib's to this problem include gem 'bcrypt', '~> 3.1.11', gem 'devise', and gem 'cocoon'.
Additional Information:
If you need any more information to help debug this problem, I will be happy to edit this post.
I don't know where the to_sys no method error is coming from. I've found a few places inside devise where it is used, but I'm having trouble deciphering why it's happening, and which exact place it's being used.
I'm using cocoon to generate multiple user fields on my form, and then trying to save them all. Perhaps I'm using cocoon incorrectly. The sample projects didn't seem to cover my use case of having a join table.
Devise github: https://github.com/plataformatec/devise
Cocoon github: https://github.com/nathanvda/cocoon