[英]How do I update Nested Attributes in Rails without accepts_nested_attributes_for?
我正在為一個班級的項目工作,其中的嵌套模型具有很大的形式。 以下是對表單及其關聯很重要的模型:
課程:has_many:time_blocks,has_many:tags,通過::taggings,belongs_to:institution,has_many:roles,has_many:users,通過::roles
TimeBlock:belongs_to:課程
我能夠正確創建嵌套表單,但是無法正確更新嵌套模型。 這是控制器,形式很長,但是我提供了嵌套模型的參數。 注意,我從參數中清除了值,但是某些參數具有ID值,因為它們存在於db中。 我還包括了CoursesHelper,以顯示我在控制器中使用的幫助器方法。
app / controllers / courses_controller.rb
def new
@course = current_user.courses.new
@course.institution = Institution.new
4.times { @course.tags.build }
7.times { @course.time_blocks.build }
end
def create
@course = Course.new(params[:course])
@course.institution = Institution.new(params[:institution])
filled_tags = set_tags(params[:tag])
@course.tags.build(filled_tags)
filled_time_blocks = set_time_blocks(params[:time_block])
@course.time_blocks.build(filled_time_blocks)
if @course.save
Role.create!(
user_id: current_user.id,
course_id: @course.id,
title: 'instructor'
)
redirect_to @course
else
(4 - filled_tags.count).times { @course.tags.build }
(7 - filled_time_blocks.count).times { @course.time_blocks.build }
flash.now[:errors] = @course.errors.full_messages
render :new
end
end
def edit
end
def update
filled_time_blocks = set_time_blocks(params[:time_block])
filled_time_blocks.each do |time_block|
@course.time_blocks.update_attributes(time_block)
end
filled_tags = set_tags(params[:tag])
filled_tags.each { |tag| @course.tags.update_attributes(tag) }
# @course.tags.update_attributes(filled_tags)
# @course.time_blocks.update_attributes(filled_time_blocks)
fail
if @course.update_attributes(params[:course])
redirect_to @course
else
flash.now[:errors] = @course.errors.full_messages
render :edit
end
end
app / helpers / courses_helper.rb
def set_time_blocks(entries)
result = []
days = entries[:day_of_week].reject! { |day| day.blank? }
days.each do |day|
time_block = {}
time_block[:day_of_week] = day
time_block[:start_time] = entries[day][:start_time]
time_block[:end_time] = entries[day][:end_time]
time_block[:id] = entries[day][:id]
result << time_block
end
result
end
def set_tags(entries)
[].tap do |tags|
entries.each do |entry|
tags << entry unless entry.values.all?(&:blank?)
end
end
end
def find_course
if params.include?(:id)
@course = Course.find(params[:id])
else
flash[:notice] = "Sorry, Could Not Find Course."
redirect_to current_user
end
end
時間塊參數
{"sun"=>{"start_time"=>"", "end_time"=>"", "id"=>""}, "mon"=>{"start_time"=>"", "end_time"=>"", "id"=>"3"}, "tue"=>{"start_time"=>"", "end_time"=>"", "id"=>"4"}, "wed"=>{"start_time"=>"", "end_time"=>"", "id"=>"5"}, "thu"=>{"start_time"=>"", "end_time"=>"", "id"=>"6"}, "fri"=>{"start_time"=>"", "end_time"=>"", "id"=>"7"}, "sat"=>{"start_time"=>"", "end_time"=>"", "id"=>""}, "day_of_week"=>[]}
標簽參數
[{"name"=>"", "id"=>"4"}, {"name"=>"", "id"=>""}, {"name"=>"", "id"=>""}, {"name"=>"", "id"=>""}]
如果您無法使其與accepts_nested_attributes_for
則必須手動編寫自己的setter方法。 就像是:
class Course < ActiveRecord::Base
def tag_attributes=(tags)
tags.each do |tag|
self.tags.build(tag)
end
end
end
方法名稱(在我的示例中為tag_attributes =)需要與標簽參數在下面列出的鍵名匹配
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