如何计算 nested_attribute 布尔值？
How to .count nested_attribute boolean?
量化的嵌套属性是结果。在结果部分中，用户将核对他们的量化结果是否为 :good。
在边栏中，我想.count用户标记了多少个好结果作为他们成功的参考点。
边栏部分：layouts/_count。html.erb
<div class="stats">
<a href="<%= following_user_path(@user) %>">
<strong id="following" class="stat">
<%= @user.quantifieds.count %> #Works
</strong>
Quantified
</a>
<a href="<%= followers_user_path(@user) %>">
<strong id="followers" class="stat">
<%= @user.results.good.count %> #Remains zero regardless of number of checked :good boxes
</strong>
Good
</a>
</div>
quantifieds/_result_fields.html.erb
<div class="nested-fields">
<div class="form-group">
<%= f.text_field :result_value, class: 'form-control', placeholder: 'Enter Result' %>
<br/>
<%= f.date_select :date_value, :order => [:month, :day, :year], :with_css_classes => true, :class => "modular-date-field" %>
<b><%= link_to_remove_association "Remove Result", f %></b>
<div class="america3">
<label> Good: </label>
<%= f.check_box :good %>
</div>
</div>
</div>
result.rb
class Result < ActiveRecord::Base
belongs_to :user
belongs_to :quantified
default_scope { order('date_value DESC') }
scope :good, -> { where(good: true) }
scope :bad, -> { where(good: false) }
end
我们是否应该向应用程序控制器添加一个方法？
class ApplicationController < ActionController::Base
before_action :load_todays_habits
before_action :set_top_3_goals
before_action :randomize_value
before_action :set_stats
protect_from_forgery with: :exception
include SessionsHelper
def set_top_3_goals
@top_3_goals = current_user.goals.unaccomplished.top_3 if current_user
end
def randomize_value
@sidebarvaluations = current_user.valuations.randomize if current_user
end
def set_stats
@quantifieds = Quantified.joins(:results).all
@averaged_quantifieds = current_user.quantifieds.averaged if current_user
@instance_quantifieds = current_user.quantifieds.instance if current_user
end
private
def load_todays_habits
@user_tags = current_user.habits.committed_for_today.tag_counts if current_user
@all_tags = Habit.committed_for_today.tag_counts if current_user
end
# Confirms a logged-in user.
def logged_in_user
unless logged_in?
store_location
flash[:danger] = "Please log in."
redirect_to login_url
end
end
end
class QuantifiedsController < ApplicationController
before_action :set_quantified, only: [:show, :edit, :update, :destroy]
before_action :logged_in_user, only: [:create, :destroy]
def index
if params[:tag]
@quantifieds = Quantified.tagged_with(params[:tag])
else
@quantifieds = Quantified.joins(:results).all
@averaged_quantifieds = current_user.quantifieds.averaged
@instance_quantifieds = current_user.quantifieds.instance
end
end
def show
end
def new
@quantified = current_user.quantifieds.build
end
def edit
end
def create
@quantified = current_user.quantifieds.build(quantified_params)
if @quantified.save
redirect_to quantifieds_url, notice: 'Quantified was successfully created'
else
@feed_items = []
render 'pages/home'
end
end
def update
if @quantified.update(quantified_params)
redirect_to quantifieds_url, notice: 'Goal was successfully updated'
else
render action: 'edit'
end
end
def destroy
@quantified.destroy
redirect_to quantifieds_url
end
private
def set_quantified
@quantified = Quantified.find(params[:id])
end
def correct_user
@quantified = current_user.quantifieds.find_by(id: params[:id])
redirect_to quantifieds_path, notice: "Not authorized to edit this goal" if @quantified.nil?
end
def quantified_params
params.require(:quantified).permit(:categories, :metric, :result, :date, :comment, :private_submit, :tag_list, :good, results_attributes: [:id, :result_value, :date_value, :good, :_destroy])
end
end
quantifieds/_form
<%= javascript_include_tag "quantified.js" %>
<%= simple_form_for(@quantified) do |f| %>
<%= f.error_notification %>
<div class="america">
<form>
<% Quantified::CATEGORIES.each do |c| %>
<%= f.radio_button(:categories, c, :class => "date-format-switcher") %>
<%= label(c, c) %>
<% end %>
<br/>
<br/>
<div class="form-group">
<%= f.text_field :tag_list, quantified: @quantified.tag_list.to_s.titleize, class: 'form-control', placeholder: 'Enter Action' %>
</div>
<div class="form-group">
<%= f.text_field :metric, class: 'form-control', placeholder: 'Enter Metric' %>
</div>
<div id="results">
<%= f.fields_for :results do |result| %>
<%= render 'result_fields', :f => result %>
<% end %>
</div>
<div class="links">
<b><%= link_to_add_association 'Add Result', f, :results %></b>
</div>
<div class="america2">
<%= button_tag(type: 'submit', class: "btn") do %>
<span class="glyphicon glyphicon-plus"></span>
<% end %>
<%= link_to quantifieds_path, class: 'btn' do %>
<span class="glyphicon glyphicon-chevron-left"></span>
<% end %>
<%= link_to @quantified, method: :delete, data: { confirm: 'Are you sure?' }, class: 'btn' do %>
<span class="glyphicon glyphicon-trash"></span>
<% end %>
</div>
<label> Private: </label>
<%= f.check_box :private_submit %>
</form>
</div>
<% end %>
quantifieds.rb
class Quantified < ActiveRecord::Base
belongs_to :user
has_many :results #correct
has_many :comments, as: :commentable
accepts_nested_attributes_for :results, :reject_if => :all_blank, :allow_destroy => true #correct
scope :averaged, -> { where(categories: 'Averaged') }
scope :instance, -> { where(categories: 'Instance') }
scope :private_submit, -> { where(private_submit: true) }
scope :public_submit, -> { where(private_submit: false) }
validates :categories, :metric, presence: true
acts_as_taggable
CATEGORIES = ['Averaged', 'Instance']
end
schema.rb
# encoding: UTF-8
# This file is auto-generated from the current state of the database. Instead
# of editing this file, please use the migrations feature of Active Record to
# incrementally modify your database, and then regenerate this schema definition.
#
# Note that this schema.rb definition is the authoritative source for your
# database schema. If you need to create the application database on another
# system, you should be using db:schema:load, not running all the migrations
# from scratch. The latter is a flawed and unsustainable approach (the more migrations
# you'll amass, the slower it'll run and the greater likelihood for issues).
#
# It's strongly recommended that you check this file into your version control system.
ActiveRecord::Schema.define(version: 20150317171422) do
create_table "activities", force: true do |t|
t.integer "trackable_id"
t.string "trackable_type"
t.integer "owner_id"
t.string "owner_type"
t.string "key"
t.text "parameters"
t.integer "recipient_id"
t.string "recipient_type"
t.datetime "created_at"
t.datetime "updated_at"
end
add_index "activities", ["owner_id", "owner_type"], name: "index_activities_on_owner_id_and_owner_type"
add_index "activities", ["recipient_id", "recipient_type"], name: "index_activities_on_recipient_id_and_recipient_type"
add_index "activities", ["trackable_id", "trackable_type"], name: "index_activities_on_trackable_id_and_trackable_type"
create_table "comments", force: true do |t|
t.text "content"
t.integer "commentable_id"
t.string "commentable_type"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
end
add_index "comments", ["commentable_id", "commentable_type"], name: "index_comments_on_commentable_id_and_commentable_type"
create_table "days", force: true do |t|
t.integer "level_id"
t.integer "habit_id"
t.boolean "missed", default: false
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
end
create_table "goals", force: true do |t|
t.string "name"
t.date "deadline"
t.boolean "accomplished"
t.boolean "private_submit"
t.integer "user_id"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
end
add_index "goals", ["user_id", "created_at"], name: "index_goals_on_user_id_and_created_at"
add_index "goals", ["user_id"], name: "index_goals_on_user_id"
create_table "habits", force: true do |t|
t.datetime "left"
t.integer "level"
t.text "committed"
t.datetime "date_started"
t.string "trigger"
t.string "target"
t.string "reward"
t.boolean "private_submit"
t.integer "user_id"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
end
add_index "habits", ["user_id", "created_at"], name: "index_habits_on_user_id_and_created_at"
add_index "habits", ["user_id"], name: "index_habits_on_user_id"
create_table "levels", force: true do |t|
t.integer "user_id"
t.integer "habit_id"
t.boolean "passed", default: false
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
end
create_table "quantifieds", force: true do |t|
t.string "categories"
t.string "metric"
t.boolean "private_submit"
t.integer "user_id"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
end
add_index "quantifieds", ["user_id", "created_at"], name: "index_quantifieds_on_user_id_and_created_at"
add_index "quantifieds", ["user_id"], name: "index_quantifieds_on_user_id"
create_table "relationships", force: true do |t|
t.integer "follower_id"
t.integer "followed_id"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
end
add_index "relationships", ["followed_id"], name: "index_relationships_on_followed_id"
add_index "relationships", ["follower_id", "followed_id"], name: "index_relationships_on_follower_id_and_followed_id", unique: true
add_index "relationships", ["follower_id"], name: "index_relationships_on_follower_id"
create_table "results", force: true do |t|
t.integer "user_id"
t.string "result_value"
t.date "date_value"
t.integer "quantified_id"
t.boolean "good"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
end
create_table "taggings", force: true do |t|
t.integer "tag_id"
t.integer "taggable_id"
t.string "taggable_type"
t.integer "tagger_id"
t.string "tagger_type"
t.string "context", limit: 128
t.datetime "created_at"
end
add_index "taggings", ["tag_id", "taggable_id", "taggable_type", "context", "tagger_id", "tagger_type"], name: "taggings_idx", unique: true
add_index "taggings", ["taggable_id", "taggable_type", "context"], name: "index_taggings_on_taggable_id_and_taggable_type_and_context"
create_table "tags", force: true do |t|
t.string "name"
t.integer "taggings_count", default: 0
end
add_index "tags", ["name"], name: "index_tags_on_name", unique: true
create_table "users", force: true do |t|
t.string "name"
t.string "email"
t.text "missed_days"
t.text "missed_levels"
t.string "provider"
t.string "uid"
t.string "oauth_token"
t.datetime "oauth_expires_at"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
t.string "password_digest"
t.string "remember_digest"
t.boolean "admin", default: false
t.string "activation_digest"
t.boolean "activated", default: false
t.datetime "activated_at"
t.string "reset_digest"
t.datetime "reset_sent_at"
end
add_index "users", ["email"], name: "index_users_on_email", unique: true
create_table "valuations", force: true do |t|
t.string "name"
t.boolean "private_submit"
t.integer "user_id"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
end
add_index "valuations", ["user_id", "created_at"], name: "index_valuations_on_user_id_and_created_at"
add_index "valuations", ["user_id"], name: "index_valuations_on_user_id"
end
class User < ActiveRecord::Base
has_many :authentications
has_many :habits, dependent: :destroy
has_many :levels
has_many :valuations, dependent: :destroy
has_many :comments, as: :commentable
has_many :goals, dependent: :destroy
has_many :quantifieds, dependent: :destroy
has_many :results, dependent: :destroy
非常感谢您的宝贵时间！
您可以按如下方式更新您的 Result：
class Result < ActiveRecord::Base
# rest of the code
scope :good, -> { where(good: true) }
scope :good_count, -> { good.count }
end
让我们在 rails console 中执行一些测试：
u = User.create({ user_attributes })
u.results.create(good: true)
u.results.create(good: false)
u.results.create(good: true)
u.results.count
# => SELECT COUNT(*) FROM "results" WHERE "results"."user_id" = ? [["user_id", 1]]
# => 3
u.results.good_count
# => SELECT COUNT(*) FROM "results" WHERE "results"."user_id" = ? AND "results"."good" = 't' [["user_id", 1]]
# => 2
如果您按如下方式更改 User：
class User < ActiveRecord::Base
# rest of the code
def good_results_count
results.good_count
end
end
这是更简洁的解决方案，您可以在您的应用程序中使用它，例如：
# assuming we have data set like in previous step
u = User.last
u.good_results_count # you can use this line in your template
# => SELECT COUNT(*) FROM "results" WHERE "results"."user_id" = ? AND "results"."good" = 't' [["user_id", 1]]
# => 2
如果由于某种原因该值仍然为 0 - 如您所述 - 尝试执行我在控制台中描述的操作以查看数据库中的真实数据。也许这不是 获取 正确数据的问题，也许数据没有正确保存？
让我知道进展情况，以便我们尝试解决真正的问题！
祝你好运！
更新
问题是由于 User 和 Result 之间缺乏适当的关联。当前在 User 中的内容：
class User < ActiveRecord::Base
# rest of the code
has_many :quantifieds, dependent: :destroy
has_many :results, dependent: :destroy
# rest of the code
end
当创建新的 Results 时 through Quantifieds，这就是你在 QuantifiedsController#create:
中的内容
class QuantifiedsController < ApplicationController
def create
@quantified = current_user.quantifieds.build(quantified_params)
if @quantified.save
redirect_to quantifieds_url, notice: 'Quantified was successfully created'
else
@feed_items = []
render 'pages/home'
end
end
end
嗯，一切看起来都很好，但实际上问题出在行@quantified = current_user.quantifieds.build(quantified_params)上。创建的所有 Result 都具有 user_id = nil，只有 quantified_id 设置正确。
如何解决？
通过简化关联！ Result中不需要同时存储quantify_id和user_id。
如果有这样的关系：User 有很多 Quantifies，而 Quantify 有很多 Results，你可以很容易地访问 Results通过在 User 中适当声明的 Users:
class User < ActiveRecord::Base
# rest of the code
has_many :quantifieds, dependent: :destroy
has_many :results, through: :quantifieds
# rest of the code
end
这是一件很聪明的事情！让我们看看幕后发生了什么：
u = User.last
u.results
Result Load (0.3ms) SELECT "results".* FROM "results" INNER JOIN "quantifieds" ON "results"."quantified_id" = "quantifieds"."id" WHERE "quantifieds"."user_id" = ? ORDER BY date_value DESC [["user_id", 5]]
=> #<ActiveRecord::Associations::CollectionProxy ...>
现在，按上述方式设置关系后，正确的计数应该会出现在网站中。
Result中不需要存储user_id，可以随意删除！
<div class="stats">
<a href="<%= following_user_path(@jadenmcgruder) %>">
<strong id="following" class="stat">
<%= @jadenmcgruder.quantifieds.count %> #Works
</strong>
Quantified
</a>
<a href="<%= followers_user _path(@jadenmcgruder) %>">
<strong id="followers" class="stat">
<%= @jadenmcgruder.results.good.count %> #Remains zero regardless of number of checked :good boxes
</strong>
Good
</a>
</div>
量化的嵌套属性是结果。在结果部分中，用户将核对他们的量化结果是否为 :good。
在边栏中，我想.count用户标记了多少个好结果作为他们成功的参考点。
边栏部分：layouts/_count。html.erb
<div class="stats">
<a href="<%= following_user_path(@user) %>">
<strong id="following" class="stat">
<%= @user.quantifieds.count %> #Works
</strong>
Quantified
</a>
<a href="<%= followers_user_path(@user) %>">
<strong id="followers" class="stat">
<%= @user.results.good.count %> #Remains zero regardless of number of checked :good boxes
</strong>
Good
</a>
</div>
quantifieds/_result_fields.html.erb
<div class="nested-fields">
<div class="form-group">
<%= f.text_field :result_value, class: 'form-control', placeholder: 'Enter Result' %>
<br/>
<%= f.date_select :date_value, :order => [:month, :day, :year], :with_css_classes => true, :class => "modular-date-field" %>
<b><%= link_to_remove_association "Remove Result", f %></b>
<div class="america3">
<label> Good: </label>
<%= f.check_box :good %>
</div>
</div>
</div>
result.rb
class Result < ActiveRecord::Base
belongs_to :user
belongs_to :quantified
default_scope { order('date_value DESC') }
scope :good, -> { where(good: true) }
scope :bad, -> { where(good: false) }
end
我们是否应该向应用程序控制器添加一个方法？
class ApplicationController < ActionController::Base
before_action :load_todays_habits
before_action :set_top_3_goals
before_action :randomize_value
before_action :set_stats
protect_from_forgery with: :exception
include SessionsHelper
def set_top_3_goals
@top_3_goals = current_user.goals.unaccomplished.top_3 if current_user
end
def randomize_value
@sidebarvaluations = current_user.valuations.randomize if current_user
end
def set_stats
@quantifieds = Quantified.joins(:results).all
@averaged_quantifieds = current_user.quantifieds.averaged if current_user
@instance_quantifieds = current_user.quantifieds.instance if current_user
end
private
def load_todays_habits
@user_tags = current_user.habits.committed_for_today.tag_counts if current_user
@all_tags = Habit.committed_for_today.tag_counts if current_user
end
# Confirms a logged-in user.
def logged_in_user
unless logged_in?
store_location
flash[:danger] = "Please log in."
redirect_to login_url
end
end
end
class QuantifiedsController < ApplicationController
before_action :set_quantified, only: [:show, :edit, :update, :destroy]
before_action :logged_in_user, only: [:create, :destroy]
def index
if params[:tag]
@quantifieds = Quantified.tagged_with(params[:tag])
else
@quantifieds = Quantified.joins(:results).all
@averaged_quantifieds = current_user.quantifieds.averaged
@instance_quantifieds = current_user.quantifieds.instance
end
end
def show
end
def new
@quantified = current_user.quantifieds.build
end
def edit
end
def create
@quantified = current_user.quantifieds.build(quantified_params)
if @quantified.save
redirect_to quantifieds_url, notice: 'Quantified was successfully created'
else
@feed_items = []
render 'pages/home'
end
end
def update
if @quantified.update(quantified_params)
redirect_to quantifieds_url, notice: 'Goal was successfully updated'
else
render action: 'edit'
end
end
def destroy
@quantified.destroy
redirect_to quantifieds_url
end
private
def set_quantified
@quantified = Quantified.find(params[:id])
end
def correct_user
@quantified = current_user.quantifieds.find_by(id: params[:id])
redirect_to quantifieds_path, notice: "Not authorized to edit this goal" if @quantified.nil?
end
def quantified_params
params.require(:quantified).permit(:categories, :metric, :result, :date, :comment, :private_submit, :tag_list, :good, results_attributes: [:id, :result_value, :date_value, :good, :_destroy])
end
end
quantifieds/_form
<%= javascript_include_tag "quantified.js" %>
<%= simple_form_for(@quantified) do |f| %>
<%= f.error_notification %>
<div class="america">
<form>
<% Quantified::CATEGORIES.each do |c| %>
<%= f.radio_button(:categories, c, :class => "date-format-switcher") %>
<%= label(c, c) %>
<% end %>
<br/>
<br/>
<div class="form-group">
<%= f.text_field :tag_list, quantified: @quantified.tag_list.to_s.titleize, class: 'form-control', placeholder: 'Enter Action' %>
</div>
<div class="form-group">
<%= f.text_field :metric, class: 'form-control', placeholder: 'Enter Metric' %>
</div>
<div id="results">
<%= f.fields_for :results do |result| %>
<%= render 'result_fields', :f => result %>
<% end %>
</div>
<div class="links">
<b><%= link_to_add_association 'Add Result', f, :results %></b>
</div>
<div class="america2">
<%= button_tag(type: 'submit', class: "btn") do %>
<span class="glyphicon glyphicon-plus"></span>
<% end %>
<%= link_to quantifieds_path, class: 'btn' do %>
<span class="glyphicon glyphicon-chevron-left"></span>
<% end %>
<%= link_to @quantified, method: :delete, data: { confirm: 'Are you sure?' }, class: 'btn' do %>
<span class="glyphicon glyphicon-trash"></span>
<% end %>
</div>
<label> Private: </label>
<%= f.check_box :private_submit %>
</form>
</div>
<% end %>
quantifieds.rb
class Quantified < ActiveRecord::Base
belongs_to :user
has_many :results #correct
has_many :comments, as: :commentable
accepts_nested_attributes_for :results, :reject_if => :all_blank, :allow_destroy => true #correct
scope :averaged, -> { where(categories: 'Averaged') }
scope :instance, -> { where(categories: 'Instance') }
scope :private_submit, -> { where(private_submit: true) }
scope :public_submit, -> { where(private_submit: false) }
validates :categories, :metric, presence: true
acts_as_taggable
CATEGORIES = ['Averaged', 'Instance']
end
schema.rb
# encoding: UTF-8
# This file is auto-generated from the current state of the database. Instead
# of editing this file, please use the migrations feature of Active Record to
# incrementally modify your database, and then regenerate this schema definition.
#
# Note that this schema.rb definition is the authoritative source for your
# database schema. If you need to create the application database on another
# system, you should be using db:schema:load, not running all the migrations
# from scratch. The latter is a flawed and unsustainable approach (the more migrations
# you'll amass, the slower it'll run and the greater likelihood for issues).
#
# It's strongly recommended that you check this file into your version control system.
ActiveRecord::Schema.define(version: 20150317171422) do
create_table "activities", force: true do |t|
t.integer "trackable_id"
t.string "trackable_type"
t.integer "owner_id"
t.string "owner_type"
t.string "key"
t.text "parameters"
t.integer "recipient_id"
t.string "recipient_type"
t.datetime "created_at"
t.datetime "updated_at"
end
add_index "activities", ["owner_id", "owner_type"], name: "index_activities_on_owner_id_and_owner_type"
add_index "activities", ["recipient_id", "recipient_type"], name: "index_activities_on_recipient_id_and_recipient_type"
add_index "activities", ["trackable_id", "trackable_type"], name: "index_activities_on_trackable_id_and_trackable_type"
create_table "comments", force: true do |t|
t.text "content"
t.integer "commentable_id"
t.string "commentable_type"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
end
add_index "comments", ["commentable_id", "commentable_type"], name: "index_comments_on_commentable_id_and_commentable_type"
create_table "days", force: true do |t|
t.integer "level_id"
t.integer "habit_id"
t.boolean "missed", default: false
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
end
create_table "goals", force: true do |t|
t.string "name"
t.date "deadline"
t.boolean "accomplished"
t.boolean "private_submit"
t.integer "user_id"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
end
add_index "goals", ["user_id", "created_at"], name: "index_goals_on_user_id_and_created_at"
add_index "goals", ["user_id"], name: "index_goals_on_user_id"
create_table "habits", force: true do |t|
t.datetime "left"
t.integer "level"
t.text "committed"
t.datetime "date_started"
t.string "trigger"
t.string "target"
t.string "reward"
t.boolean "private_submit"
t.integer "user_id"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
end
add_index "habits", ["user_id", "created_at"], name: "index_habits_on_user_id_and_created_at"
add_index "habits", ["user_id"], name: "index_habits_on_user_id"
create_table "levels", force: true do |t|
t.integer "user_id"
t.integer "habit_id"
t.boolean "passed", default: false
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
end
create_table "quantifieds", force: true do |t|
t.string "categories"
t.string "metric"
t.boolean "private_submit"
t.integer "user_id"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
end
add_index "quantifieds", ["user_id", "created_at"], name: "index_quantifieds_on_user_id_and_created_at"
add_index "quantifieds", ["user_id"], name: "index_quantifieds_on_user_id"
create_table "relationships", force: true do |t|
t.integer "follower_id"
t.integer "followed_id"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
end
add_index "relationships", ["followed_id"], name: "index_relationships_on_followed_id"
add_index "relationships", ["follower_id", "followed_id"], name: "index_relationships_on_follower_id_and_followed_id", unique: true
add_index "relationships", ["follower_id"], name: "index_relationships_on_follower_id"
create_table "results", force: true do |t|
t.integer "user_id"
t.string "result_value"
t.date "date_value"
t.integer "quantified_id"
t.boolean "good"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
end
create_table "taggings", force: true do |t|
t.integer "tag_id"
t.integer "taggable_id"
t.string "taggable_type"
t.integer "tagger_id"
t.string "tagger_type"
t.string "context", limit: 128
t.datetime "created_at"
end
add_index "taggings", ["tag_id", "taggable_id", "taggable_type", "context", "tagger_id", "tagger_type"], name: "taggings_idx", unique: true
add_index "taggings", ["taggable_id", "taggable_type", "context"], name: "index_taggings_on_taggable_id_and_taggable_type_and_context"
create_table "tags", force: true do |t|
t.string "name"
t.integer "taggings_count", default: 0
end
add_index "tags", ["name"], name: "index_tags_on_name", unique: true
create_table "users", force: true do |t|
t.string "name"
t.string "email"
t.text "missed_days"
t.text "missed_levels"
t.string "provider"
t.string "uid"
t.string "oauth_token"
t.datetime "oauth_expires_at"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
t.string "password_digest"
t.string "remember_digest"
t.boolean "admin", default: false
t.string "activation_digest"
t.boolean "activated", default: false
t.datetime "activated_at"
t.string "reset_digest"
t.datetime "reset_sent_at"
end
add_index "users", ["email"], name: "index_users_on_email", unique: true
create_table "valuations", force: true do |t|
t.string "name"
t.boolean "private_submit"
t.integer "user_id"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
end
add_index "valuations", ["user_id", "created_at"], name: "index_valuations_on_user_id_and_created_at"
add_index "valuations", ["user_id"], name: "index_valuations_on_user_id"
end
class User < ActiveRecord::Base
has_many :authentications
has_many :habits, dependent: :destroy
has_many :levels
has_many :valuations, dependent: :destroy
has_many :comments, as: :commentable
has_many :goals, dependent: :destroy
has_many :quantifieds, dependent: :destroy
has_many :results, dependent: :destroy
非常感谢您的宝贵时间！
您可以按如下方式更新您的 Result：
class Result < ActiveRecord::Base
# rest of the code
scope :good, -> { where(good: true) }
scope :good_count, -> { good.count }
end
让我们在 rails console 中执行一些测试：
u = User.create({ user_attributes })
u.results.create(good: true)
u.results.create(good: false)
u.results.create(good: true)
u.results.count
# => SELECT COUNT(*) FROM "results" WHERE "results"."user_id" = ? [["user_id", 1]]
# => 3
u.results.good_count
# => SELECT COUNT(*) FROM "results" WHERE "results"."user_id" = ? AND "results"."good" = 't' [["user_id", 1]]
# => 2
如果您按如下方式更改 User：
class User < ActiveRecord::Base
# rest of the code
def good_results_count
results.good_count
end
end
这是更简洁的解决方案，您可以在您的应用程序中使用它，例如：
# assuming we have data set like in previous step
u = User.last
u.good_results_count # you can use this line in your template
# => SELECT COUNT(*) FROM "results" WHERE "results"."user_id" = ? AND "results"."good" = 't' [["user_id", 1]]
# => 2
如果由于某种原因该值仍然为 0 - 如您所述 - 尝试执行我在控制台中描述的操作以查看数据库中的真实数据。也许这不是 获取 正确数据的问题，也许数据没有正确保存？
让我知道进展情况，以便我们尝试解决真正的问题！
祝你好运！
更新
问题是由于 User 和 Result 之间缺乏适当的关联。当前在 User 中的内容：
class User < ActiveRecord::Base
# rest of the code
has_many :quantifieds, dependent: :destroy
has_many :results, dependent: :destroy
# rest of the code
end
当创建新的 Results 时 through Quantifieds，这就是你在 QuantifiedsController#create:
class QuantifiedsController < ApplicationController
def create
@quantified = current_user.quantifieds.build(quantified_params)
if @quantified.save
redirect_to quantifieds_url, notice: 'Quantified was successfully created'
else
@feed_items = []
render 'pages/home'
end
end
end
嗯，一切看起来都很好，但实际上问题出在行@quantified = current_user.quantifieds.build(quantified_params)上。创建的所有 Result 都具有 user_id = nil，只有 quantified_id 设置正确。
如何解决？
通过简化关联！ Result中不需要同时存储quantify_id和user_id。
如果有这样的关系：User 有很多 Quantifies，而 Quantify 有很多 Results，你可以很容易地访问 Results通过在 User 中适当声明的 Users:
class User < ActiveRecord::Base
# rest of the code
has_many :quantifieds, dependent: :destroy
has_many :results, through: :quantifieds
# rest of the code
end
这是一件很聪明的事情！让我们看看幕后发生了什么：
u = User.last
u.results
Result Load (0.3ms) SELECT "results".* FROM "results" INNER JOIN "quantifieds" ON "results"."quantified_id" = "quantifieds"."id" WHERE "quantifieds"."user_id" = ? ORDER BY date_value DESC [["user_id", 5]]
=> #<ActiveRecord::Associations::CollectionProxy ...>
现在，按上述方式设置关系后，正确的计数应该会出现在网站中。
Result中不需要存储user_id，可以随意删除！
<div class="stats">
<a href="<%= following_user_path(@jadenmcgruder) %>">
<strong id="following" class="stat">
<%= @jadenmcgruder.quantifieds.count %> #Works
</strong>
Quantified
</a>
<a href="<%= followers_user _path(@jadenmcgruder) %>">
<strong id="followers" class="stat">
<%= @jadenmcgruder.results.good.count %> #Remains zero regardless of number of checked :good boxes
</strong>
Good
</a>
</div>