我遇到了非常奇怪的问题。我有Timetable模型并尝试编写我的自定义验证。所以，现在我只是想为字段添加测试错误以确保一切正常。但它不起作用。所以，我尝试更新时间表模型的对象，但是当我不使用我的测试自定义验证时，一切都很完美。否则我会收到这样的错误：
NoMethodError in Timetables#update
undefined method `map' for nil:NilClass
32:
33: <div class="controls">
34: <%= f.select( :curriculum_id,
35: options_for_select( @subjects_with_curriculums,
36: @tt.curriculum_id ),
37: { :include_blank => true }) %>
38: </div>
这是我的模型：
# == Schema Information
#
# Table name: timetables
#
# id :integer not null, primary key
# curriculum_id :integer
# school_class_id :integer
# tt_day_of_week :string(255)
# tt_number_of_lesson :integer
# tt_room :string(255)
# tt_type :string(255)
# created_at :datetime not null
# updated_at :datetime not null
#
class Timetable < ActiveRecord::Base
belongs_to :curriculum
belongs_to :school_class
has_many :lessons
validates :school_class_id, :presence => { :message => "should exist" }
validates :tt_day_of_week,
:presence => true,
:inclusion => { :in => %w(Mon Tue Wed Thu Fri) }
validates :tt_number_of_lesson,
:presence => true,
:inclusion => {
:in => 1..9,
:message => "should have 1..9 symbols"
}
validates :tt_room,
:length => {
:maximum => 3,
:message => "should have 3 symbols"
},
:allow_blank => true
validates :tt_type,
:inclusion => { :in => ["Primary lesson", "Extra"] },
:allow_blank => true
validate :test
def test
errors.add(:tt_number_of_lesson, "test")
end
end
我的控制器：
# encoding: UTF-8
class TimetablesController < ApplicationController
...
def edit
@types_of_lesson = collect_types_of_lesson
@tt = Timetable.find( params[:id] )
@subjects_with_curriculums = collect_subjects_with_curriculums( @tt.school_class )
end
def update
@tt = Timetable.find( params[:id] )
if @tt.update_attributes( params[:timetable] )
flash[:success] = "Расписание успешно обновлено!"
redirect_to timetables_path
else
flash.now[:error] = @tt.errors.full_messages.to_sentence :last_word_connector => ", ",
:two_words_connector => ", "
render 'edit'
end
end
private
# Collecting subjects names for school class and curriculum_id for each subject.
def collect_subjects_with_curriculums( school_class )
subjects = school_class.curriculums.collect do |c|
[ c.qualification.subject.subject_name, c.id ]
end
end
def timetable_for_class_with_existance_data( school_class )
return [] if Timetable.all.empty?
Timetable.select do |t|
( t.school_class.class_code == school_class.class_code ) and
not ( t.tt_room.blank? ) and not ( t.tt_type.blank? ) and
not ( t.curriculum_id.nil? )
end.to_a
end
# Return for school class it's timetable.
def timetable_for_class( school_class )
Timetable.select{|t| t.school_class.class_code == school_class.class_code }.to_a
end
def subjects_of_class( school_class )
subjects = school_class.curriculums.collect do |c|
c.qualification.subject.subject_name
end
end
# Return sorted by number of lesson tometable for one day.
def sorted_timetable_for_day( timetable, day )
timetable.select{ |t| t.tt_day_of_week == day }
.sort_by{ |e| e[:tt_number_of_lesson] }
end
# Return russian name for type of lesson.
def collect_types_of_lesson
[ ["Обязательно занятие", "Primary lesson"], ["Электив", "Extra"] ]
end
# Check if timetable already has been created for school class.
def timetable_exists?( school_class )
not timetable_for_class( school_class ).empty?
end
end
我的观点
<%= form_for @tt, :html => {:class => "form-horizontal"} do |f| %>
<%= field_set_tag do %>
<%= f.hidden_field :tt_number_of_lesson %>
<%= f.hidden_field :tt_day_of_week %>
<%= f.hidden_field :school_class_id %>
<div class="control-group">
<%= f.label :tt_day_of_week, "Day of the week", :class => "control-label" %>
<div class="controls">
<%= content_tag( :span, translate_day_of_week( @tt.tt_day_of_week ),
:class =>"input-xlarge uneditable-input span2" ) %>
</div>
</div>
<div class="control-group">
<%= f.label :tt_number_of_lesson, "Number of lesson", :class => "control-label" %>
<div class="controls">
<%= content_tag( :span, @tt.tt_number_of_lesson,
:class =>"input-xlarge uneditable-input span1" ) %>
</div>
</div>
<hr/>
<div class="control-group">
<%= f.label :curriculum_id, "Type of subject", :class => "control-label" %>
<div class="controls">
<%= f.select( :curriculum_id,
options_for_select( @subjects_with_curriculums,
@tt.curriculum_id ),
{ :include_blank => true }) %>
</div>
</div>
<div class="control-group">
<%= f.label :tt_room, "Code of the room", :class => "control-label" %>
<div class="controls">
<%= f.text_field :tt_room, :class => "span2", :maxlength => 3 %>
</div>
</div>
<div class="control-group">
<%= f.label :tt_type, "Type of the lesson", :class => "control-label" %>
<div class="controls">
<%= f.select( :tt_type,
options_for_select( @types_of_lesson,
@tt.tt_type ),
{ :include_blank => true }) %>
</div>
</div>
<%= f.submit "Update", :class => "btn btn-large btn-warning" %>
<% end %>
<% end %>
当我删除：
<div class="control-group">
<%= f.label :curriculum_id, "Type of subject", :class => "control-label" %>
<div class="controls">
<%= f.select( :curriculum_id,
options_for_select( @subjects_with_curriculums,
@tt.curriculum_id ),
{ :include_blank => true }) %>
</div>
</div>
<div class="control-group">
<%= f.label :tt_type, "Type of the lesson", :class => "control-label" %>
<div class="controls">
<%= f.select( :tt_type,
options_for_select( @types_of_lesson,
@tt.tt_type ),
{ :include_blank => true }) %>
</div>
</div>
我可以查看我的测试错误。我不知道发生了什么。