Accessing model associations in Rails 4 through a link -

i want connect user , event models, created participation model. (one user can attend many events, , 1 event can have many users participating.)

user.rb

class user < activerecord::base   # include default devise modules. others available are:   # :confirmable, :lockable, :timeoutable , :omniauthable   devise :database_authenticatable, :registerable,      :recoverable, :rememberable, :trackable, :validatable    has_many :statuses   has_many :participations   has_many :events, through: :participation    validates_presence_of :first_name, :last_name    def to_param    profile_name   end    def full_name     first_name + " " + last_name   end end 

event.rb

class event < activerecord::base   has_many :participations  has_many :users, through: :participations   end 

participation.rb

class participation < activerecord::base  belongs_to :user  belongs_to :event   end 

i'm not sure how link in events index; far, have default link (link_name) in events/index.html.erb allows page load redirects individual event page when signs up:

<%= link_to link_name, event %>

i tried change part this:

<%= link_to new, new_participation_path(event) %>

which throws me error:

nameerror in events#index showing /home/ubuntu/workspace/app/views/events/index.html.erb line #10 raised:  uninitialized constant actionview::compiledtemplates::new extracted source (around line #10):       7  <%= event.event_date_time.strftime("%a %d @ %i:%m %p") %></p>      8 <div class="meta">    9    <% link_name = "sign up!" %>  10    <%= link_to new, new_participation_path(event) %>  11        <span class="admin">| <%= link_to "edit", edit_event_path(event) %> |  12      <% message = "are sure want delete event?" %>  13      <%= link_to "delete", event, method: :delete, data: { confirm: message} %> 

this create_participations migration:

class createparticipations < activerecord::migration

create_table :participations |t|      t.belongs_to :user, index: true      t.belongs_to :event, index: true     t.datetime :participation_date      t.timestamps null: false  end  end 

i added new definition participation controller:

def new      @participation = participation.new  end 

and here participation related routes (for reason there 2 sets):

    participation    /participation(.:format)         participation#index    new_participation    /new_participation(.:format)     participation#new   show_participation    /show_participation(.:format)    participation#show          participate    /participate(.:format)           participation#create update_participation    /update_participation(.:format)  participation#update delete_participation    /delete_participation(.:format)  participation#destroy  participation_index    /participation/index(.:format)   participation#index   participation_show    /participation/show(.:format)    participation#show participation_create    /participation/create(.:format)  participation#create   participation_edit    /participation/edit(.:format)    participation#edit participation_update    /participation/update(.:format)  participation#update    participation_new    /participation/new(.:format)     participation#new 

participation_destroy /participation/destroy(.:format) participation#destroy

i'm not quite sure i've gone wrong here.

here entire github repo project:

https://github.com/yamilethmedina/wheels_registration.git