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undefined method `map' for nil:NilClass on select_collection
I have been struggling with this error for the last 3 hours and its s bit frustrating: Here is the scenario
I am trying to populate a select box with Team names that belong to a specific team leader here are my models and code
user.rb belongs_to :team has_many :attendances, dependent: :destroy belongs_to :team_leader, class_name: "User" has_many :agents, class_name: "User", foreign_key: "team_leader_id" team.rb class Team < ActiveRecord::Base validates :team_code, :description, presence: true validates :team_code, uniqueness: true has_and_belongs_to_many :users has_many :attendance_sheets end attendance_sheet/new <div class="field"> <%= f.label :Team %><br> <%= f.collection_select(:team_id, @team, :id, :team_code) %> </div>
the other partial with the user, _attendance_fields.html.erb
<div class="nested-fields"> <tr> <td><%= f.collection_select(:user_id, @users, :id, :name ) %></td> <td><%= f.check_box :present%></td> <td><%= f.select :reason, ["a","b"] %></td> <td><%= link_to_remove_association "Remove attendance", f, class: "form-button btn btn-default" %></td> </tr> </div>
whenever i try to create an attendance sheet i the undefined method map error for both the partial and main form. I want to be able to see on teams that belong the user logged and also only the users belonging to the team/logged team_leader
I am not sure if my self join table is well done either
Your first collection_select for @team, is that variable an array? Only arrays (or enumerable objects) have a map method. The map method is called internally inside the collection_select, so if that happens to be just a team record, then that could be the problem.
You'll either want to make that variable an array or adjust that accordingly to how you want it to work I think.
the first part @team is an array the Teams assigned to a specific Team leader
Hmm, well then it isn't as easy of a solution. ;) Which line of the view is it tripping on then? What's your stacktrace look like?
Started GET "/attendance_sheets/new" for 127.0.0.1 at 2015-12-11 18:03:36 +0300 Processing by AttendanceSheetsController#new as HTML Rendered attendance_sheets/_form.html.erb (3.3ms) Rendered attendance_sheets/new.html.erb within layouts/application (4.0ms) Completed 500 Internal Server Error in 25ms (ActiveRecord: 0.0ms) ActionView::Template::Error (undefined method `map' for nil:NilClass): 16: <% end %> 17: <div class="field"> 18: <%= f.label :Team %><br> 19: <%= f.collection_select(:team_id, @team, :id, :team_code) %> 20: </div> 21: <div class="field"> 22: <%= f.label :date %><br> app/views/attendance_sheets/_form.html.erb:19:in `block in _app_views_attendance_sheets__form_html_erb___3904306276885524695_69942133851520' app/views/attendance_sheets/_form.html.erb:5:in `_app_views_attendance_sheets__form_html_erb___3904306276885524695_69942133851520' app/views/attendance_sheets/new.html.erb:7:in `_app_views_attendance_sheets_new_html_erb__3506630663733362946_69942134392600'
will that help ?