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  • how to save related models with non-null foreign key

    - by Fortress
    I have a model called user which has_one email. I put the foreign key (NOT NULL) inside users table. Now I'm trying to save it in the following way: @email = Email.new(params[:email]) @email.user = User.new(params[:user]) @email.save This raises a db exception, because the foreign key constraint is not met (NULL is inserted into email_id). How can I elegantly solve this or is my data modeling wrong?

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  • attempt to write a readonly database in Android2.1

    - by JoJo
    This is the error: android.database.sqlite.SQLiteException: attempt to write a readonly database This is my code: SQLiteDatabase db = mDatabase.getWritableDatabase(); db.beginTransaction(); try { // add new records ContentValues newRecord = new ContentValues(); newRecord.put(Emergencydetails.EMERGENCYNUMBER, emergencyNumber.getText().toString()); db.insert(Emergencydetails.EMERGENCY_TABLE_NAME, null, newRecord); db.setTransactionSuccessful(); } finally { db.endTransaction(); }

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  • VB.net SyncLock Object

    - by Budius
    I always seen on SyncLock examples people using Private Lock1 As New Object ' declaration SyncLock Lock1 ' usage but why? In my specific case I'm locking a Queue to avoid problems on mult-threading Enqueueing and Dequeueing my data. Can I lock the Queue object itself, like this? Private cmdQueue As New Queue(Of QueueItem) ' declaration SyncLock cmdQueue ' usage Any help appreciated. Thanks.

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  • Group by with ActiveRecord in Rails

    - by Adnan
    Hello, I have a the following table with rows: ================================================================ id | name | group1 | group2 | group3 | group4 | ================================================================ 1 | Bob | 1 | 0 | 0 | 1| ================================================================ 2 | Eric| 0 | 1 | 0 | 1| ================================================================ 3 | Muris | 1 | 0 | 1 | 1| ================================================================ 4 | Angela | 0 | 0 | 0 | 1| ================================================================ What would be the most efficient way to get the list with ActiveRecords ordered by groups and show their count like this: group1 (2) group2 (1) group3 (1) group4 (4) All help is appreciated.

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  • How to use the IN operator in linq

    - by Hallaghan
    I'm querying a view and filtering the results with a column named status. I'd like to query it so I can search for rows with different status, by using the IN operator as I'd do in SQL. As so: SELECT * FROM VIEW WHERE Status in ('....', '.....') How can I achieve this?

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  • Does SQL Server guarantee sequential inserting of an identity column?

    - by balpha
    In other words, is the following "cursoring" approach guaranteed to work: retrieve rows from DB save the largest ID from the returned records for later, e.g. in LastMax later, "SELECT * FROM MyTable WHERE Id > {0}", LastMax In order for that to work, I have to be sure that every row I didn't get in step 1 has an Id greater than LastMax. Is this guaranteed, or can I run into weird race conditions?

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  • My PC suddenly reboots

    - by ChocoDeveloper
    Yesterday I opened my PC hub (after like, 5 years) to add more RAM and a new HDD. It was full of dust and balls of fluff, so I cleaned it a bit by blowing. I also removed the fan that was attached to the motherboard (I think it's there to cool the processor) and I cleaned it also by blowing and with a paintbrush, then put it back where it was (it had 4 weird plastic screws, it wasn't easy). Then I added 2 x 2Gib of RAM (Kingston 1333MHz), and the new HDD (Western Digital Caviar Blue 1TB SATA 3). I couldn't find another wire like the one my first disk had, which was thicker, but there was one that was more flat, so I plugged it and it worked fine (I also plugged the wire that I think is for the data, which looks like many little wires glued together). I'm running Ubuntu 12.04, and in the new disk I've just installed Windows 7. Between yesterday and today, two reboots ocurred while working on Ubuntu. I haven't used Windows 7 that much so I don't know if it will happen there too. So where can I begin to debug this?

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  • Dictionary w/ null key?

    - by Ralph
    Firstly, why doesn't Dictionary<TKey, TValue> support a single null key? Secondly, is there an existing dictionary-like collection that does? I want to store an "empty" or "missing" or "default" System.Type, thought null would work well for this. More specifically, I've written this class: class Switch { private Dictionary<Type, Action<object>> _dict; public Switch(params KeyValuePair<Type, Action<object>>[] cases) { _dict = new Dictionary<Type, Action<object>>(cases.Length); foreach (var entry in cases) _dict.Add(entry.Key, entry.Value); } public void Execute(object obj) { var type = obj.GetType(); if (_dict.ContainsKey(type)) _dict[type](obj); } public static void Execute(object obj, params KeyValuePair<Type, Action<object>>[] cases) { var type = obj.GetType(); foreach (var entry in cases) { if (entry.Key == null || type.IsAssignableFrom(entry.Key)) { entry.Value(obj); break; } } } public static KeyValuePair<Type, Action<object>> Case<T>(Action action) { return new KeyValuePair<Type, Action<object>>(typeof(T), x => action()); } public static KeyValuePair<Type, Action<object>> Case<T>(Action<T> action) { return new KeyValuePair<Type, Action<object>>(typeof(T), x => action((T)x)); } public static KeyValuePair<Type, Action<object>> Default(Action action) { return new KeyValuePair<Type, Action<object>>(null, x => action()); } } For switching on types. There are two ways to use it: Statically. Just call Switch.Execute(yourObject, Switch.Case<YourType>(x => x.Action())) Precompiled. Create a switch, and then use it later with switchInstance.Execute(yourObject) Works great except when you try to add a default case to the "precompiled" version (null argument exception).

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  • Drupal return number of results in a View

    - by Linda
    I have a view in Drupal that filters my content. It brings back 7 rows. All I want to return is the number or results returned(7). Is this possible? I tried using the View result counter but it returns a number for each results 1 2 3 4 5 6 7 I just need the 7 part. So in SQL I would do a select count(*)

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  • SQL Query Theory Question...

    - by Keng
    I have a large historical transaction table (15-20 million rows MANY columns) and a table with one row one column. The table with one row contains a date (last processing date) which will be used to pull the data in the trasaction table ('process_date'). Question: Should I inner join the 'process_date' table to the transaction table or the transaction table to the 'process_date' table?

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  • Looking for advice on how to do some bit-twiddling [closed]

    - by davit-datuashvili
    hi everybody fisrt of all this is not homework and now question is like this suppose i have array int a[]=new int[]{0xBCDA,0xABFE,0xBCAD,0xEFCA,0xFFCA} i know that there is always some hexadecimal number which occurs in all number or in this case A is repeat in array everywhere so my aim is print only repeat number and other numbers should be zero so my new array should be like this 0x000A, 0xA000,0x00A0 0x000A,0x000A any idea please help me? p.s please nobody say that this is homework

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  • Any suggestions for improvement on this style for BDD/TDD?

    - by Sean B
    I was tinkering with doing the setups with our unit test specifciations which go like Specification for SUT when behaviour X happens in scenario Y Given that this thing And also this other thing When I do X... Then It should do ... And It should also do ... I wrapped each of the steps of the GivenThat in Actions... any feed back whether separating with Actions is good / bad / or better way to make the GivenThat clear? /// <summary> /// Given a product is setup for injection /// And Product Image Factory Is Stubbed(); /// And Product Size Is Stubbed(); /// And Drawing Scale Is Stubbed(); /// And Product Type Is Stubbed(); /// </summary> protected override void GivenThat() { base.GivenThat(); Action givenThatAProductIsSetupforInjection = () => { var randomGenerator = new RandomGenerator(); this.Position = randomGenerator.Generate<Point>(); this.Product = new Diffuser { Size = new RectangularProductSize( 2.Inches()), Position = this.Position, ProductType = Dep<IProductType>() }; }; Action andProductImageFactoryIsStubbed = () => Dep<IProductBitmapImageFactory>().Stub(f => f.GetInstance(Dep<IProductType>())).Return(ExpectedBitmapImage); Action andProductSizeIsStubbed = () => { Stub<IDisplacementProduct, IProductSize>(p => p.Size); var productBounds = new ProductBounds(Width.Feet(), Height.Feet()); Dep<IProductSize>().Stub(s => s.Bounds).Return(productBounds); }; Action andDrawingScaleIsStubbed = () => Dep<IDrawingScale>().Stub(s => s.PixelsPerFoot).Return(PixelsPerFoot); Action andProductTypeIsStubbed = () => Stub<IDisplacementProduct, IProductType>(p => p.ProductType); givenThatAProductIsSetupforInjection(); andProductImageFactoryIsStubbed(); andProductSizeIsStubbed(); andDrawingScaleIsStubbed(); andProductTypeIsStubbed(); }

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  • Show a form from another form

    - by M.H
    Hi,When I want to Display a from (C#) by clicking a button in another form I usually create an object form the form that I want to show and use the show method : Form2 f2 = new Form2(); f2.Show(); or I work with the "Owner" : Form2 tempForm = new Form2(); this.AddOwnedForm(tempForm); tempForm.Show(); the tow ways generate the same results but what is the best and what are the differences between them?

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  • Android: How to properly exit application when inconsistent condition is unavoidable?

    - by Bevor
    First of all I already read about all this discussion that it isn't a good idea to manually exit an Android application. But in my case it seems to be needed. I have an AsyncTask which does a lof of operations in background. That means downloading data, saving it to local storage and preparing it for usage in application. It could happen that there is no internet connection or something different happens. For all that cases I have an Exception handling which returns the result. And if there is an exception, the application is unusable so I need to exit it. My question is, do I have to do some unregistration unloading or unbinding tasks or something when I exit the application by code or is System.exit(0) ok? I do all this in an AsyncTask, see my example: public class InitializationTask extends AsyncTask<Void, Void, InitializationResult> { private ProcessController processController = new ProcessController(); private ProgressDialog progressDialog; private Activity mainActivity; public InitializationTask(Activity mainActivity) { this.mainActivity = mainActivity; } @Override protected void onPreExecute() { super.onPreExecute(); progressDialog = new ProgressDialog(mainActivity); progressDialog.setMessage("Die Daten werden aufbereitet.\nBitte warten..."); progressDialog.setIndeterminate(true); //means that the "loading amount" is not measured. progressDialog.setCancelable(false); progressDialog.show(); }; @Override protected InitializationResult doInBackground(Void... params) { return processController.initializeData(); } @Override protected void onPostExecute(InitializationResult result) { super.onPostExecute(result); progressDialog.dismiss(); if (!result.isValid()) { AlertDialog.Builder dialog = new AlertDialog.Builder(mainActivity); dialog.setTitle("Initialisierungsfehler"); dialog.setMessage(result.getReason()); dialog.setPositiveButton("Ok", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { dialog.cancel(); //TODO cancel application System.exit(0); } }); dialog.show(); } } }

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  • HTML format using Java mail in android

    - by TheDevMan
    I am trying to implement an HTML format mail using the Java mail in android. I would like to get results like this: When I look at the html format sent from lookout in my GMAIL. I don't see any link, but just has this format: [image: Lookout_logo] [image: Signal_flare_icon] Your battery level is really low, so we located your device with Signal Flare. I was trying the following: Properties props = System.getProperties(); props.put("mail.smtp.starttls.enable", "true"); // added this line props.put("mail.smtp.host", host); props.put("mail.smtp.user", from); props.put("mail.smtp.password", pass); props.put("mail.smtp.port", "587"); props.put("mail.smtp.auth", "true"); javax.mail.Session session = javax.mail.Session.getDefaultInstance(props, null); MimeMessage message = new MimeMessage(session); message.setFrom(new InternetAddress(from)); InternetAddress[] toAddress = new InternetAddress[to.length]; // To get the array of addresses for( int i=0; i < to.length; i++ ) { // changed from a while loop toAddress[i] = new InternetAddress(to[i]); } message.setRecipients(Message.RecipientType.BCC, toAddress); message.setSubject(sub); //message.setText(body); body = "<!DOCTYPE html><html><body><img src=\"http://en.wikipedia.org/wiki/Krka_National_Park#mediaviewer/File:Krk_waterfalls.jpg\">"; message.setContent(body, "text/html; charset=utf-8"); Transport transport = session.getTransport("smtp"); transport.connect(host, from, pass); transport.sendMessage(message, message.getAllRecipients()); transport.close(); When I look at the html format sent with the above code. I get the following: <!DOCTYPE html><html><body><img src="http://en.wikipedia.org/wiki/Krka_National_Park#mediaviewer/File:Krk_waterfalls.jpg> How to make sure the user will not be able to see any html code or URL link like the mail sent by LOOKOUT? Thanks!

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  • How does Response.Redirect calculate the URL for "~/folder1/folder2/some.aspx"

    - by Chris Marisic
    This might sound like a trivial problem but for some reason it is not. Instead of needing to redirect Response.Redirect("~/folder1/folder2/some.aspx") I need the location as if it behaved like string navigatingUrl = Response.Redirect("~/folder1/folder2/some.aspx") Trying to replicate this I started with string navigatingUrl = new Uri(HttpContext.Current.Request.Url, new Uri("~/folder1/folder2/some.aspx", UriKind.Relative)); This instead generates "http://www.fullRequestUrl/~/folder1/folder2/some.aspx"

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  • Dictionary/Hashmap......... what on earth is happening?

    - by Tom
    else if (!registryData.ContainsKey(kyInvolved)) { keyInvolved = new RegistryKy(kyInvolved); lock (registryDataLock) { registryData.Add(kyInvolved, keyInvolved); } processInvolved = new Proces(procInvolved); keyInvolved.addProcessToDict(processInvolved); } kyInvolved is a String which represents a registry key. keyInvolved is the actual registry key object. I'm being told that im adding a key which already exists, yet i have already checked to see whether it is in there or not???

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  • how to convert BigInteger to String in java

    - by Bipul
    i converted a string to BigInteger as follows: Scanner sc=new Scanner(System.in); System.out.println("enter the message"); String msg=sc.next(); byte[] bytemsg=msg.getBytes(); BigInteger m=new BigInteger(bytemsg); now i want my string back.i m using m.toString() method but not getting desired result. why??? what is bug in it and what is its remedy.

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  • PHP Doctrine: filtering data which is already loaded?

    - by ropstah
    I'm new to Doctrine and ActiveRecord. How should I filter a table after it has been loaded? (i suppose this is preferred over sending multiple queries?) Is this 'good' or 'bad'? class UserTable extends Doctrine_Table { function filterByGroup($group) { $ut = new UserTable(); foreach($this as $u) { if($u->group = $group) $ut->add($u); } return $ut; } }

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  • Reading a large text file to memory in C++

    - by NoneType
    Is there a way to read a large text file (~60MB) into memory at once (like a compiler flag to increase program memory limit) ? Currently, ofstream's open function throws a segmentation fault while trying to read this file. ifstream fis; fis.open("my_large_file.txt"); // Segfaults here The file just consists of rows of the form number_1<tabspace>number_2 i.e., two numbers separated by a tabspace.

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  • Large memory chunk not garbage collected

    - by Niels
    In a hunt for a memory-leak in my app I chased down a behaviour I can't understand. I allocate a large memory block, but it doesn't get garbage-collected resulting in a OOM, unless I explicit null the reference in onDestroy. In this example I have two almost identical activities that switch between each others. Both have a single button. On pressing the button MainActivity starts OOMActivity and OOMActivity returns by calling finish(). After pressing the buttons a few times, Android throws a OOMException. If i add the the onDestroy to OOMActivity and explicit null the reference to the memory chunk, I can see in the log that the memory is correctly freed. Why doesn't the memory get freed automatically without the nulling? MainActivity: package com.example.oom; import android.app.Activity; import android.content.Intent; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; public class MainActivity extends Activity implements OnClickListener { private int buttonId; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); System.gc(); Button OOMButton = new Button(this); OOMButton.setText("OOM"); buttonId = OOMButton.getId(); setContentView(OOMButton); OOMButton.setOnClickListener(this); } @Override public void onClick(View v) { if (v.getId() == buttonId) { Intent leakIntent = new Intent(this, OOMActivity.class); startActivity(leakIntent); } } } OOMActivity: public class OOMActivity extends Activity implements OnClickListener { private static final int WASTE_SIZE = 20000000; private byte[] waste; private int buttonId; protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); Button BackButton = new Button(this); BackButton.setText("Back"); buttonId = BackButton.getId(); setContentView(BackButton); BackButton.setOnClickListener(this); waste = new byte[WASTE_SIZE]; } public void onClick(View view) { if (view.getId() == buttonId) { finish(); } } }

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