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

c# - passing input text from view to contoller with FacebookContext using Facebook app -

I'm trying to pass an input text from the viewer to the controller in the Facebook Birthday app: Link to app: In the Home Controller [FacebookAuthorize ("email", "user_photos")] Public async Tasks & lt; ActionResult & gt; Index (FacebookContext reference) {if (ModelState.IsValid) {var user = waiting for reference. Client.Gate CurrentUserAsync & lt; MyAppUser & gt; (); View return (user); } See Return ("Error"); } [Http post] [facebook authorized ("email", "user_photo")) public async task & lieutenant; Actionsclass & gt; Index (string textile, facebookcontonte context) {if (ModelState.IsValid) {var user = wait context.Client.GetCurrentUserAsync & lt; MyAppUser & gt; (); // See my code, see the use of txt here (user); } See Return ("Error"); } View: @using facebookpostc.models @ Microsoft.AspNet.Mvc.Facebook.models using @ Microsoft.AspNet.Mvc. Facebook @model MyAppUser @ {ViewB...
Read more

ios - Does Core Data autoupdate a many to many relationship on saving -

I have used 2 database tables and core data / NSManagedObjects in SQLite: User is user_id name group (multiple groups) Group group_id title group members (multiple users) By using core data to save a group and adding users ( Add to group) as follows: group * cordata = zero; Cordata = [NSEntityDescription insertNewObjectForEntityForName: @ Managed Object Contains in "Groups": Reference]; Request = [NSFetchRequest fetchRequestWithEntityName: @ "user"]; Request.predicate = [NSPredicate predicateWithFormat: @ "user_id =% @", user_id]; Result = [reference executeFetchRequest: request error: & amp; Error]; CoreData.group_id = group_id Cordettitle = Title [Cordata AdGroupMailersObject: [Last objections result]]; Is it right to say that core data manages a user with multiple users and groups with the code above? Yes, if the relationships are in the form of each other's inverse relationship The inverse relationships are updated automaticall...
Read more

Calling a C++ function from C# by passing a string with variable size to it -

I am calling a string with a C + code and calling from the C # code. The C ++ function is responsible for filling the string material. The following code is: C #party: var abc = new string builder (4096); // will have to change this var result = Basic methods. SignCrcFile (ABC); C ++: bool __cdecl SignCrcFile (char * abc) {... char * tempStr = "hello all"; // for example // copy it to ABC string strcpy (ABC, tempStr); Back true; } The problem is that tempStr's size in the C ++ function is dynamic (the above assignment for TempStr is only an example). In such a case, it is not a hard code that the size of ABC string is in the size of 4096 bytes on the C #. The first solution can be a solution to create 2 functions on the C ++ side to get the size of the string. Then allocate that size using StringBuilder in the C # side then use the next function to bring the entire string from C ++ to the C #. But no suggestion this may not be the most optimal way? ...
Read more