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  • Setting the initial value of a property when using DataContractSerializer

    - by Eric
    If I am serializing and later deserializing a class using DataContractSerializer how can I control the initial values of properties that were not serialized? Consider the Person class below. Its data contract is set to serialize the FirstName and LastName properties but not the IsNew property. I want IsNew to initialize to TRUE whether a new Person is being instantiate as a new instance or being deserialized from a file. This is easy to do through the constructor, but as I understand it DataContractSerializer does not call the constructor as they could require parameters. [DataContract(Name="Person")] public class Person { [DataMember(Name="FirstName")] public string FirstName { get; set; } [DataMember(Name = "LastName")] public string LastName { get; set; } public bool IsNew { get; set; } public Person(string first, string last) { this.FirstName = first; this.LastName = last; this.IsNew = true; } }

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  • Django ModelFormSet with Google app engine

    - by Eric
    I'm using Django with google app engine. I'm using the google furnished django app engine helper project. I'm attempting to create a Django modelformset like this: #MyModel inherits from BaseModel MyFormSet = modelformset_factory(models.MyModel) However, it's failing with this error: 'ModelOptions' object has no attribute 'fields' Apparently modelformset_factory() is expecting MyModel to implement a 'fields' accessor. Anybody successfully used a modelformset with GAE datastore? Or is this a fundamental incompatibility between Django and GAE?

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  • VS 2010 Class Diagram Error "The type cannot be edited..."

    - by Eric J.
    A few of the classes on a VS 2010 class diagram are displayed with a red title. The Class Details window shows all of the methods, properties, fields and correctly shows no events. However, there's an entry under each of methods, properties, fields and events that states where the name should be: "The type cannot be edited because the source code file contains an error." However, the source file builds with no errors or warnings. Anyone seen this? Any idea how to fix it?

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  • Split or save a subset of a ESRI Shape SHP file to a new file?

    - by Eric Palakovich Carr
    I'm working with shape files in GeoDjango. Right now I'm trying to write a test for code that loads in a shape file and saves it to a database. The shape file currently has a feature count of 64,118. I'd like to reduce this to a handful so the test can quickly load it and confirm everything is right. Since shape files aren't in a text format, is there a free application or library I can use to pluck out a handful of features and save them to a new file? I should mention I don't have a license nor access to any of the ESRI product line.

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  • how do I redirect from a subdirectory to another directory, but strip off the original subdirectory

    - by Eric Cope
    I have a Ruby on Rails app running on 12001. I am currently redirecting a subdomain to 127.0.0.1:12001 using some ReWriteCond detection. Now I want to redirect my subdirectory to that rails app. http[s]://domain.com/redmine to 127.0.0.1:12001 The current rules apply REQUEST_URI to the above rails path, but I need to strip "/redmine" from the front of REQUEST_URI... Any ideas?

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  • Is there a standard for storing normalized phone numbers in a database?

    - by Eric Z Beard
    What is a good data structure for storing phone numbers in database fields? I'm looking for something that is flexible enough to handle international numbers, and also something that allows the various parts of the number to be queried efficiently. [Edit] Just to clarify the use case here: I currently store numbers in a single varchar field, and I leave them just as the customer entered them. Then, when the number is needed by code, I normalize it. The problem is that if I want to query a few million rows to find matching phone numbers, it involves a function, like where dbo.f_normalizenum(num1) = dbo.f_normalizenum(num2) which is terribly inefficient. Also queries that are looking for things like the area code become extremely tricky when it's just a single varchar field. [Edit] People have made lots of good suggestions here, thanks! As an update, here is what I'm doing now: I still store numbers exactly as they were entered, in a varchar field, but instead of normalizing things at query time, I have a trigger that does all that work as records are inserted or updated. So I have ints or bigints for any parts that I need to query, and those fields are indexed to make queries run faster.

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  • How do I maintain scroll position in MVC?

    - by Eric Brown
    Im working on a project in MVC and have enjoyed learning about it. There are a few growing pains but once you figure them out it's not bad. One thing that is really simple in the WebForms world is maintaining the scroll position on a page. All you do is set the MaintainScrollPositionOnPostback property to true. However, in MVC, Im not using postbacks so this will not work for me. What is the standard way of handling this? Edit: Ajax is acceptable, but I was also wondering how you would do it without AJAX.

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  • What is an index in MySQL?

    - by Eric
    http://i.imgur.com/JdsUK.jpg I created a table like the picture above. What are the "Indexes"? primary key? unique? It works well without setting indexes.. What do they do? why do I need them? Also, I set all String fields to TEXT because I didn't know how many characters I need. Is this a good idea? I don't see any difference. Thanks!

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  • How to test when a feature was added to Perl?

    - by Eric Strom
    Are there any services similar to codepad that will allow you to test Perl constructs on old versions of perl? Ideally, a system where you could enter an expression and it will tell you the oldest version of perl that it will work with. Of course it's possible to use CPANTS for this, but that seems like an abuse of the service (if only for making the BackPan bigger). And it could take several days/weeks to get decent test coverage on old versions.

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  • non-latin email address validation

    - by Eric Di Bari
    Now that ICann is allowing non-latin-character domain names, should I be concerned about e-mail validation? Currently, my sites are using php functions to ensure some alpha-numeric character set in each segment of an email address. Will these other character sets, such as Cyrillic, Arabic, and Chinese, pass validation? Are there recommended php functions to utilize for this?

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  • How do I model teams and gameplay in this scorekeeping application?

    - by Eric Hill
    I'm writing a scorekeeping application for card game that has a few possibly-interesting constraints. The application accepts user registrations for players, then lets them check-in to a particular game (modeled as Event). After the final player registers, the app should generate teams, singles or doubles, depending on the preference of the person running the game and some validations (can't do doubles if there's an odd number checked in). There are @event.teams.count rounds in the game. To sum up: An event consists of `@event.teams.count` rounds; Teams can have 1 or more players Events have n or n/2 teams (depending on whether it's singles or doubles) Users will be members of different teams at different events Currently I have a rat's nest of associations: class User < ActiveRecord::Base has_many :teams, :through => :players has_many :events, :through => :teams class Event < ActiveRecord::Base has_many :rounds has_many :teams has_many :players, :through => :teams class Player < ActiveRecord::Base belongs_to :user belongs_to :team end class Team < ActiveRecord::Base has_many :players belongs_to :event end class Round < ActiveRecord::Base belongs_to :event belongs_to :user end The sticky part is team generation. I have basically a "start game" button that should freeze the registrations and pair up teams either singly or doubly, and render to Round#new so that the first (and subsequent) matches can be scored. Currently I'm implementing this as a check on Round#new that calls Event#generate_teams and displays the view: # Event#generate_teams def generate_teams # User has_many :events, :through => :registrations # self.doubles is a boolean denoting 2 players per team registrations.in_groups_of(self.doubles ? 2 : 1, nil).each do |side| self.teams << Player.create(self,side) end end Which doesn't work. Should there maybe be a Game model that ties everything together rather than (my current method) defining the game as an abstraction via the relationships between Events, Users, and Rounds (and Teams and Players and etc.)? My head is swimming.

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  • Customizing the behavior of ControlDesigners for Controls derived from native .NET controls.

    - by Eric
    My question is related to this question: http://stackoverflow.com/questions/93541/baseline-snaplines-in-custom-winforms-controls However, in my case, I have created a new control that derives from TextBox rather than containing a TextBox. I would like to have a custom ControlDesigner, but I would like to modify the behavior of the TextBox's designer rather than having to write a complete designer myself. In particular, I'd like to be able to return the TextBox's SnapLines while providing some custom verbs. Is there a good way to do this? EDIT: To clarify, this is for Windows Forms in .NET 2.0.

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  • Google indexing to a staging server.

    - by Eric
    A site that I was working is resolving to a staging server through google. I've removed all the information. How long does it take for google to update the information so that it does not show up. is there anyone that I can contact to move this along?

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  • What is IPKVM and why would I need that to install SQL Server on my Web Server?

    - by Eric
    Hello. I have a dedicated server, and will be installing SQL Server. However, my hosting company said they can connect an external CD ROM drive and give me KVM over IP to install SQL Server. My question is, what is IPKVM, and how does it work? Do I need special hardware or software on my side to use it....or do I just connect via remote desktop? Also, why can't I remote into my server through remote desktop instead of using KVM over IP?

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  • input file cannot be found

    - by Eric Smith
    I am just messing around with reading input files with java until I got stumped at the most basic of steps... finding the input file! The input.txt file is in the same directory as my class file that is calling it yet eclipse still gives me an error that it cant be found: "Exception in thread "main" java.lang.Error: Unresolved compilation problem: Unhandled exception type FileNotFoundException" My code: package pa; import java.util.Scanner; public class Project { public static void main(String[] args) { java.io.File file = new java.io.File("input.txt"); System.out.println(file.getAbsolutePath()); Scanner input = new Scanner(file); } } input.txt is in the same package, same folder and everything. I'm confused :(

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  • Best method to compress JSON string in term of performance and compress radio

    - by Eric Yin
    For a JSON string, contains all kinds of settings, numbers, string etc. Total JSON string fairly fall into 10k~50K range. I want to compress it before save to database. So I wonder which compress method should I choose, I am using c# 4, I know I can choose gzip and deflate but the compression radio is not good (although speed is good). More specific, compress can be a little slow (since only once) but should be small. Decompress should be lighting fast since decompress happens lots. Please give some advice.

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  • How can I download information from bank accounts?

    - by Eric Anastas
    There are a number of free finance tracking sites out there like mint.com, wesabe.com etc.. . I've tried all of them and all seem to miss the mark in one way or another. I'm interested in creating my own website, or possibly just a stand alone windows program for tracking my finances in ASP.NET or C#.NET. I'm assuming the answer is no, but is there any way that a personal developer can download transactions from financial websites like these? I know once you login to most financial sites you can download a CSV or Quicken file. Yet I really like how I can log-in to my Mint.com account and update all my accounts with one click.

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  • Has anyone got the vim taglist plugin working with Scala?

    - by Eric Hauser
    I'm having trouble getting the taglist plugin working properly with Scala. I've installed the plugin and ctags and verified that it works properly with Java and C++. I then followed the instructions on this page (minus the Lift specific instructuions), but was nothing shows up in the taglist window when I open it while editing a Scala file. Has anyone got this working and what are the proper steps? Thanks.

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  • How can I write an XSLT that will recursively include other files?

    - by Eric
    Let's say I have a series of xml files in this format: A.xml: <page> <header>Page A</header> <content>blAh blAh blAh</content> </page> B.xml: <page also-include="A.xml"> <header>Page B</header> <content>Blah Blah Blah</content> </page> Using this XSLT: <xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"> <xsl:template match="/page"> <h1> <xsl:value-of select="header" /> </h1> <p> <xsl:value-of select="content" /> </p> </xsl:template> </xsl:stylesheet> I can turn A.xml into this: <h1> Page A </h1> <p> blAh blAh blAh </p> But how would I make it also turn B.xml into this? <h1> Page B </h1> <p> Blah Blah Blah </p> <p> blAh blAh blAh </p> I know that I need to use document(concat(@also-include,'.xml')) somewhere, but I'm not sure where. Oh, and the catch is, I need this to still work if B were to be included in a third file, C.xml. Any idea as to how to do this?

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  • Is the MySQL FOSS License Exception transitive - does it remove the GPL restrictions for downstream

    - by Eric
    I'm looking at building a MySQL client plugin for a proprietary product, which would violate the GPL as discussed in the FAQ at http://www.gnu.org/licenses/gpl-faq.html#NFUseGPLPlugins However, according to the MySQL FOSS License Exception ("FLE"), discussed at http://www.mysql.com/about/legal/licensing/foss-exception/, you can license an open-source product built with the client with many alternatives. The oursql library (https://launchpad.net/oursql) is BSD-licensed. Is this a valid way around the GPL? By my reading of the FLE, the only clause that refers to downstream uses of derived works is section 2.e: All works that are aggregated with the Program or the Derivative Work on a medium or volume of storage are not derivative works of the Program, Derivative Work or FOSS Application, and must reasonably be considered independent and separate works. This is the case for our product: it is not a derivative work of oursql, and in fact accesses it only via a plugin-driven interface. So is this a valid loophole?

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  • javascript turn single line break to double line break

    - by Eric Sim
    Hm... I'm trying to convert single line break into double line break, as in This is a sentence. This is another sentence. into This is a sentence. This is another sentence. Apparently this doesn't work ThisContent = ThisContent.replace(/(\n)/gm, "\n\n"); since it replace everything, including double line breaks. What's the regex to do this?

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  • IE8 rendering of local-files is wrong

    - by Eric
    It appears that IE8 is not rendering properly a local file: Consider this simple webpage: http://sayang.free.fr/ie8render.html (html code below) extracted from a w3c tutorial on opacity. Save it locally and display it again: the local file has no opacity! That's very annoying, especially when one wants to design complex pages on prototypes placed in local files. Do you have a solution to that ? <html> <head> <title>IE8 Local File</title> <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1" /> <meta http-equiv="pragma" content="no-cache" /> <meta http-equiv="cache-control" content="no-cache" /> <meta http-equiv="expires" content="-1" /> <style type="text/css"> div.background { width: 500px; height: 250px; background: url(http://www.w3schools.com/css/klematis.jpg) repeat; border: 2px solid black; } div.transbox { width: 400px; height: 180px; margin: 30px 50px; background-color: #ffffff; border: 1px solid black; /* for IE */ filter:alpha(opacity=60); /* CSS3 standard */ opacity:0.6; } div.transbox p { margin: 30px 40px; font-weight: bold; color: #000000; } </style> </head> <body> <h2>Save this file locally and open it to see the difference</h2> <div class="background"> <div class="transbox"> <p>This is some text that is placed in the transparent box. This is some text that is placed in the transparent box. This is some text that is placed in the transparent box. This is some text that is placed in the transparent box. This is some text that is placed in the transparent box.</p> </div> </div> </body> </html>

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  • Financial Charts / Graphs in Ruby or Python

    - by Eric the Red
    What are my best options for creating a financial open-high-low-close (OHLC) chart in a high level language like Ruby or Python? While there seem to be a lot of options for graphing, I haven't seen any gems or eggs with this kind of chart. http://en.wikipedia.org/wiki/Open-high-low-close_chart (but I don't need the moving average or Bollinger bands) JFreeChart can do this in Java, but I'd like to make my codebase as small and simple as possible. Thanks!

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