Rails 4 - scope with has_one instead of attribute -


मेरे पास निम्न दो मॉडल हैं: 

  वर्ग व्यक्ति & lt; ActiveRecord :: बेस है_ऑन: संग्रह, आश्रित = & gt; : नष्ट क्लास संग्रह & lt; ActiveRecord :: बेस is_to: व्यक्ति   
  संग्रह  होल्ड  person_id ।  
 मुझे एक गुंजाइश < कोड> Person.with_archive । चूंकि  व्यक्ति  के पास  archive_id  का कोई भी डीबी स्तंभ नहीं है, इसलिए मैंने पाया कि एकमात्र उपाय है:  
  def self.has_archive res = Array.new self .all.each do | i | रिज & लेफ्टिनेंट; & lt; मैं अगर! I.archive.nil? एंड रिज़ एंड   
 समस्या यह है कि मुझे रिश्ते के बजाय एक अर्रे मिलती है, जो मुझे अन्य स्कोप श्रृंखला के लिए सीमित करता है  
 उस के लिए कोई भी अच्छा और साफ समाधान ?? धन्यवाद!   
 
 
 इसे आज़माएं:  
  गुंजाइश: with_archive, - & gt ; {Joins (: archive)}   
 यह केवल एक संग्रह के साथ ही व्यक्ति को वापस करना चाहिए, क्योंकि  शामिल होता है  एक  INNER JOIN  statement का उपयोग करता है

Comments

Post a Comment

Popular posts from this blog

Java - Error: no suitable method found for add(int, java.lang.String) -

I'm in the middle of homework work and I'm stuck. At this point in my code, I think that I should have a GUI window that opens and allows me to type "inserted text number". Notice is not going anywhere but at this point, If I pass through the problem then it will be in a linked list. I am getting two of the same error for the lines. Add (index, element); And I can not seem to get past it, there is no suitable method for the error "add (int, java. string string)". Code is below, please advise. To clarify - this will not be a method error because it is a linked list. There should not be any way involved. import java.awt. *; Import java.awt.event. *; Import javax.swing. *; Import java.util. *; Import java.util.Scanner; Import java.util.LinkedList; Public class TopTenList JFrame {Private TopTenList tt; See the Private JTextArea list; Private JTextField cmdTextField; Private JTextField resultsTestfield; // This GUI window is the code for the public toptist...
Read more

java - JPA TypedQuery: Parameter value element did not match expected type -

I am using JPA 2.0 and getting the following code in the DAO layer: Public Zero Test () {string key = "status"; String [] Conditions = {"A", "B"}; & Lt; TestTable & gt; Results = Search (Keys, Conditions); } Public listing & lt; TestTable & gt; Search (string key, object value error) {string sql = "test ndf to testlet and jade nand." + Key + "in:" + key; TypedQuery & LT; TestTable & gt; Query = entityManager.createQuery (SQL, TestTable.class); Query.setParameter (key, Arrays.asList (valueArr)) / *** Error Line *** Return query.getResultList (); } In the above error line, it throws the following exception: java.lang.IllegalArgumentException: parameter value element [[Ljava.lang.String; @ cbe5bc] did not match the expected type [java.lang.String] Why is this expected type string while actually this string []? Please help! Note: This is derived from the normal routine and is a simplified code. I can no...
Read more

c++ - static template member variable has internal linkage but is not defined -

Yes, I know, there is a question with almost the same title, but it refers to a different situation. Error message) In my case, I have a .cpp file with a big named designation name (implementation details). There is a property class template with a static data member in that name space, which I need to access from outside the unknown namespace. I give it a little bit of meat: file.hpp namespace Bar {template & lt; Typename A & gt; Struct foo {static_assert (is_same & lt; a, float & gt; :: value} is_same & lt; a, double>: value, ""); Fixed zero set_static_var (a const & x); // ...}; } and file.cpp namespace {template & lt; Typename A & gt; Struct foo_traits {// supports the implementation of several static code bars: foo & lt; & Gt; Fixed A data; }; The template's & lt; & Gt; Float foo_traits & lt; Float & gt; :: datum; // No change if this is in the global namespace template & lt; & Gt; Doub...
Read more