[英]Rails 4 - Can't save model without creating new nested model with 'has_one' association
我有一个可见性模型,该模型具有一些布尔属性和定义其他模型如何显示的其他内容。 可见性是多态的,因为我希望它既属于User模型又属于Activity模型。 能见度:
class Visibility < ActiveRecord::Base
belongs_to :viewable, :polymorphic => true
end
用户(已编辑为包括总数):
class User < ActiveRecord::Base
# Relations
#has_many :posts
has_one :fb_connection
has_many :activities
has_many :participations
has_many :activities, :through => :participations
has_one :visibility, as: :viewable, dependent: :destroy
accepts_nested_attributes_for :visibility
has_many :friendships
has_many :friends, :through => :friendships
has_many :sent_friend_invites, :through => :friendships
has_many :received_friend_invites, :through => :friendships
devise :database_authenticatable, :registerable,
:recoverable, :rememberable, :trackable, :validatable, :confirmable
# Callback to set a user's default visibility for their activities
before_save :default_values
# paperclip helper method
has_attached_file :profile_pic, styles: {
thumb: '100x100>',
square: '200x200#',
medium: '300x300>'
}, default_url: "https://dl.dropboxusercontent.com/u/743320/q_silhouette.gif"
# Pagination
paginates_per 100
# Validations
# :email
validates :first_name, presence: true
validates :last_name, presence: true
validates_format_of :email, with: /\A([^@\s]+)@((?:[-a-z0-9]+\.)+[a-z]{2,})\Z/i
# Paperclip validation
validates_attachment :profile_pic, :size => { :in => 0..10.megabytes }, :content_type => { :content_type => /^image\/(jpeg|png|gif|tiff)$/}
def self.paged(page_number)
order(admin: :desc, email: :asc).page page_number
end
def self.search_and_order(search, page_number)
if search
where("email LIKE ?", "%#{search.downcase}%").order(
admin: :desc, email: :asc
).page page_number
else
order(admin: :desc, email: :asc).page page_number
end
end
def self.last_signups(count)
order(created_at: :desc).limit(count).select("id","email","created_at")
end
def self.last_signins(count)
order(last_sign_in_at:
:desc).limit(count).select("id","email","last_sign_in_at")
end
def self.users_count
where("admin = ? AND locked = ?",false,false).count
end
def get_display_name
if display_name =~ /./ # Just check that the display name is not ""
#puts "display name: " + display_name
return display_name
else
#puts "name: " + [first_name, last_name].join(" ")
return [first_name, last_name].join(" ")
end
end
def get_profile_pic_thumb
return profile_pic(:thumb)
end
def measurement_labels
return I18n.t('user_label_use_metric_true') if use_metric
end
private
def default_values
viewable ||= Visibility.create(default_viewable_params)
end
def default_viewable_params
{:public => true, :app_friends => true, :facebook_friends => true, :strava_friends => true, :viewable => self }
end
end
活动(相关部分):
class Activity < ActiveRecord::Base
...
has_one :visibility, as: :viewable, dependent: :destroy
...
end
我一辈子都做不到。 任何时候只要保存用户模型(即使未修改可见性模型),它都会为用户创建一个新的可见性模型。 例如,在控制台中:
user = User.find(5)
user.foo = false
user.save
我得到以下输出:
(0.4ms)BEGIN SQL(1.0ms)插入“可见性”(“ public”,“ app_friends”,“ facebook_friends”,“ viewable_id”,“ viewable_type”,“ created_at”,“ updated_at”)值($ 1,$ 2, $ 3,$ 4,$ 5,$ 6,$ 7)返回“ id” [[“ public”,“ t”],[“ app_friends”,“ t”],[“ facebook_friends”,“ t”],[“ viewable_id”, 5],[“ viewable_type”,“用户”],[“ created_at”,“ 2015-10-23 23:06:57.431922”],[“ updated_at”,“ 2015-10-23 23:06:57.431922”] ](21.3ms)COMMIT => true
当然,尝试通过用户更新可见性模型失败。 在更新时,也会在其位置创建一个新的。 这是适用的user_controller方法和使用simple_form_for的视图:
#user_controller
def preferences
@user = current_user
if !@user.visibility
@user.visibility = Visibility.new
end
end
def update_preferences
user = current_user
user.update!(user_pref_params)
flash[:notice] = I18n.t('user_flash_update_success')
redirect_to profile_path(user)
end
private
def user_pref_params
params.require(:user).permit(:use_metric, visibility_attributes: [:id, :public, :app_friends, :facebook_friends])
end
<!-- preferences form -->
<%= simple_form_for @user, :url => update_preferences_path do |f| %>
<%= f.simple_fields_for :visibility do |v| %>
<%= v.input :public, label: t('user_preferences_label_public'), as: :select, required: false %>
<%= v.input :app_friends, label: t('user_preferences_label_app_friends'), as: :select, required: false %>
<%= v.input :facebook_friends, label: t('user_preferences_label_facebook_friends'), as: :select, required: false %>
<% end %>
<!-- Preference for system of measurement -->
<%= f.input :use_metric, as: :select, collection: [[t('user_preferences_use_metric_true'), true], [t('user_preferences_use_metric_false'), false]], label: t('user_preferences_label_use_metric'), include_blank: false %>
<!-- Submit button -->
<%= f.button :submit, :label => "Save", :class => "btn btn-primary" %>
<% end %>
这种大规模分配的尝试给了我以下反馈:
从2015年10月23日17:02:52 -0700开始为127.0.0.1的PATCH“ / users / updateprefs”,由UsersController#update_preferences作为HTML参数进行处理:{“ utf8” =>“✓”,“ authenticity_token” =>“ FXj3kWxNDE7tl7InvBvL68UzlvmWR / d3aJ4 / gTg7cCCEGEafJJZO10ud31kU2120SdKF3aNj5gy0FiizURHTeQ =“ =” “” =>“ 64”},“ use_metric” =>“ true”},“提交” =>“更新用户”}用户负载(0.4毫秒)选择“用户”。*来自“用户”,而“用户”。 id“ = $ 1 ORDER BY” users“。” id“ ASC LIMIT 1 [[” id“,55]](0.3ms)开始可见性负载(0.8ms)选择“ visibilities”。*从“ visibilities”中选择“ visibilities” 。“ viewable_id” = $ 1和“ visibilities”。“ viewable_type” = $ 2 LIMIT 1 [[“” viewable_id“,55],[” viewable_type“,” User“]] SQL(0.6ms)插入“ visibilities”(“ public “,” app_friends“,” facebook_friends“,” viewable_id“,” viewable_type“,” created_at“,” updated_at“)值($ 1,$ 2,$ 3,$ 4,$ 5,$ 6,$ 7)返回“ id” [[[” public “,” t“],[” a pp_friends“,” t“],[” facebook_friends“,” t“],[” viewable_id“,55],[” viewable_type“,” User“],[” created_at“,” 2015-10-24 00:02 :52.244397“],[” updated_at“,” 2015-10-24 00:02:52.244397“]] SQL(0.5ms)UPDATE” users“ SET” use_metric“ = $ 1,” updated_at“ = $ 2 WHERE” users“。 “ id” = $ 3 [[“” use_metric“,” t“],[” updated_at“,” 2015-10-24 00:02:52.247304“],[” id“,55]] SQL(0.5ms)UPDATE”可见性“ SET” app_friends“ = $ 1,” updated_at“ = $ 2,” visibilities“。” id“ = $ 3 [[”“ app_friends”,“ f”],[“ updated_at”,“ 2015-10-24 00:02: 52.250120“],[” id“,64]](13.3ms)提交
如您所见,Rails既创建了新的可见性,又更新了现有的可见性! 也许我可以用杰瑞(Jerry-rig)操纵它,用一些非常丑陋的代码来解决它,但是我希望能为保持控制器动作整洁提供任何帮助。
在User
模型中,使用default_values
方法创建新的可见性并将其分配给viewable
。 但是,此方法的作用域仅适用于方法,而不适用于整个类(因此可以与方法变量进行比较)。
另外, viewable
是仅在Visibility
模型中的关联的正确用法。 在User
模型中,您必须将其作为visibility
引用。
需要做的是使用self
来将比较和赋值应用于实例变量。
def default_values
self.visibility ||= Visibility.create(default_viewable_params)
end
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