damon09273 / event_manager Goto Github PK

start do

end

start do |i|

end

(1..10).each do |n|
puts n
end

resources :events do
resource :location
end

Rails::Application.configure do |config|
config.time_zone = 'Asia/Taipei'
end

<% @attendees.each do |attendee| %>
<%= attendee.name %>
<% end %>

variable
method
@instance_variable

@i # => nil
@i = 10
@i # => 10

variable # => undefined local variable or method `variable'`
method   # => undefined local variable or method `method`

@event.name # => "Undefined method `name` for nil:NilClass"
# Routes => Controller => View
# Columns
# has_many, belongs_to

class Foo
attr_accessor :bar

               def initialize

               end

               def set_bar
               @bar = "foobar"
               end
               end

               foo = Foo.new
               foo.bar # => nil
               foo.set_bar
               foo.bar # => "foobar"

# =======

def setup_event(event)
  event.build_location unless event.location
  event
  end

def render_hash(hash)
puts hash[:foo]
puts hash[:bar]
end

render_hash({:foo => "foobar", :bar => "foobar"})

render_hash(:foo => "foobar", :bar => "foobar")

render_hash(foo: "foobar", bar: "foobar")

render_hash foo: "foobar", bar: "foobar"

has_many :events, through: :memberships
has_many :memberships

belongs_to :event
belongs_to :user

has_many :users, through: :memberships
has_many :memberships

def current_user
  User.first
end

def join
  @event = Event.find(params[:id])
  Membership.find_or_create_by(:event => @event, :user => current_user)
  redirect_to :back
end

def withdraw
  @event = Event.find(params[:id])
  @membership = Membership.find_by(:event => @event, :user => current_user)
  @membership.destroy if @membership
  redirect_to :back
end