如何在軌道上過濾每個模型名稱的記錄數組ruby

Question

假設我有元素的散列，並且需要根據其中的類名過濾掉結果。

因此，如果記錄包含PrivateSchool的元素，我可以將PrivateSchool記錄傳遞到其各自的部分。

如果記錄包含教師的元素，我可以將教師記錄傳遞給其各自的部分。

所以，這裏是partails代碼：

<% if params[:tab] && params[:tab] == "featured" %> 
    <%= render partial: "featured", locals: {featured: @results} %> 
<% elsif params[:tab] && params[:tab] == "schools" %> 
    <%= render partial: "schools", locals: {schools: @results} %> 
<% elsif params[:tab] && params[:tab] == "playlists" %> 
    <%= render partial: "playlists", locals: {playlists: @results} %> 
<% elsif params[:tab] && params[:tab] == "quizzes" %> 
    <%= render partial: "quizzes", locals: {quizzes: @results} %> 
<% elsif params[:tab] && params[:tab] == "teachers" %> 
    <%= render partial: "teachers", locals: {teachers: @results} %> 
<% end %> 

如果我做<%= @results.inspect%>它下面的輸出：

[#<LessonPlan id: 9, title: "advance java", description: "advance java", 
notes: "advance java", subject_id: 2, teacher_id: 1, created_at: "2016-11-11 
09:29:20", updated_at: "2016-11-11 09:29:20", is_private: true, is_publish: 
false, user_id: 3, publish_date: nil, popularity_count: 0, is_special: false, 
private_class_id: nil>, #<Quiz id: 1, title: "java history", 
time_limit_in_minutes: 5, are_multiple_attempts_allowed: true, score_to_keep: 
"highest", number_of_attempts_allowed: 4, student_see_quiz_score: 
"after_each_attempt", show_one_question_at_a_time: true, is_private: false, 
available_from_date_time: "2016-11-08 17:13:00", available_due_date_time: 
"2016-11-10 17:18:00", instructions: "<p>java basics</p>", lesson_plan_id: 3, 
user_id: 3, publish_date: "2016-11-09 12:14:04", created_at: "2016-11-09 
12:14:04", updated_at: "2016-11-09 12:19:25", is_publish: true, subject_id: 3, 
teacher_id: 1, popularity_count: 1, show_answers: "after_the_due_date">, 
#<LessonPlan id: 4, title: "basics of java", description: "basics of java", 
notes: "basics of java", subject_id: 2, teacher_id: 1, created_at: "2016-11-07 
13:04:24", updated_at: "2016-11-10 10:40:54", is_private: false, is_publish: 
false, user_id: 3, publish_date: "2016-11-09 08:08:41", popularity_count: 0, 
is_special: false, private_class_id: nil>, #<Quiz id: 6, title: "java modern", 
time_limit_in_minutes: 155, are_multiple_attempts_allowed: true, 
score_to_keep: "latest", number_of_attempts_allowed: 9, 
student_see_quiz_score: "after_last_attempt", show_one_question_at_a_time: 
true, is_private: true, available_from_date_time: "2017-02-02 01:11:00", 
available_due_date_time: "2017-02-27 01:11:00", instructions: "<p>java modern 
java modern java modern java modern...", lesson_plan_id: 3, user_id: 3, 
publish_date: "2016-12-22 20:37:35", created_at: "2016-12-22 20:37:35", 
updated_at: "2017-02-09 20:11:38", is_publish: false, subject_id: 3, 
teacher_id: 1, popularity_count: 0, show_answers: "after_the_due_date">, 
#<Quiz id: 4, title: "Java quiz v1", time_limit_in_minutes: 180, 
are_multiple_attempts_allowed: true, score_to_keep: "latest", 
number_of_attempts_allowed: 6, student_see_quiz_score: "after_last_attempt", 
show_one_question_at_a_time: false, is_private: false, 
available_from_date_time: "2016-11-21 12:48:00", available_due_date_time: 
"2016-11-23 12:48:00", instructions: "<p>Java quiz v1</p>\r\n<p 
style=\"margin: 0px;\"><!--E...", lesson_plan_id: 8, user_id: 3, publish_date: 
"2016-11-14 07:18:41", created_at: "2016-11-14 07:18:41", updated_at: 
"2016-12-11 14:21:46", is_publish: false, subject_id: 3, teacher_id: 1, 
popularity_count: 0, show_answers: "after_the_quiz">, #<Quiz id: 3, title: 
"java basics", time_limit_in_minutes: 4, are_multiple_attempts_allowed: true, 
score_to_keep: "highest", number_of_attempts_allowed: 10, 
student_see_quiz_score: "after_last_attempt", show_one_question_at_a_time: 
true, is_private: false, available_from_date_time: "2017-01-31 14:13:00", 
available_due_date_time: "2017-02-17 14:13:00", instructions: 
"<p>XXXXXXXXXXQQQQ</p>", lesson_plan_id: 8, user_id: 3, publish_date: 
"2016-11-10 20:27:32", created_at: "2016-11-10 20:27:31", updated_at: 
"2017-02-01 09:13:22", is_publish: false, subject_id: 3, teacher_id: 1, 
popularity_count: 1, show_answers: "after_the_quiz">, #<PrivateSchool id: 18, 
teacher_id: 39, user_id: 47, title: "Dr. Jasmine E McNair High School", 
short_description: "Dr. Jasmine E McNair High School", price_type: "paid", 
logo: "download.jpg", slug: "dr-jasmine-e-mcnair-high-school", created_at: 
"2016-12-13 20:18:28", updated_at: "2016-12-13 20:18:28">] 

我真正想要的是過濾這些記錄每個模型類的名字，所以我可以過濾記錄並將相應的記錄發送到其分部，而不是僅在每個部分中顯示所有記錄。

目前它顯示在一個部分是錯誤的所有記錄我需要過濾每個部分，因此每個部分將顯示他的結果而不是其他模型。

因此， 如果記錄屬於LessonPlan，則來自LessonPlan的所有記錄將以部分課程計劃進行。

如果記錄屬於教師所有來自教師的記錄將進入教師偏分數。 等。

這是我的要求。

@results.select { |r| r.is_a?(LessonPlan) } # etc. 

因此您的視圖可以是這樣的：

<%= render partial: "lesson_plans", locals: { 
    lesson_plans: @results.select { |r| r.is_a?(LessonPlan) } 
} %> 

Answer 1

你可以嘗試這樣的事情：

hash = @results.group_by(&:class) 

然後

Answer 2

結果可以用select方法進行過濾：

hash[LessonPlan] will give you a list of all the LessonPlan 

編輯：

<%= render partial: "quizzes", locals: {quizzes: hash[Quiz]} %> 

說明： 第一步。我們根據對象的類創建哈希。爲了做到這一點，我們使用Ruby方法'group_by'作爲E​​numerable。 @ results.group_by（&：class）相當於@ results.group_by {| result |結果[：class]}
然後我們可以通過類名輕鬆地訪問每個散列的值。哈希[測驗]將返回所有的測驗對象。