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• TextBoxFor rendering to HTML with prefix on the ID attribute

  - by msi

  I have an ASPNET MVC 2 project. When I use <%= Html.TextBoxFor(model => model.Login) %> the TexBoxFor will render as <input id="Login" name="Login" type="text" value="" /> Field in the model is [Required(ErrorMessage = "")] [DisplayName("Login")] public string Login { get; set; } Can I made id and name attribute with some prefix? Like <input id="prefixLogin" name="prefixLogin" type="text" value="" /> Thanks to all.

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• Proper way to add record to many to many relationship in Django

  - by blcArmadillo

  First off, I'm planning on running my project on google app engine so I'm using djangoappengine which as far as I know doesn't support django's ManyToManyField type. Because of this I've setup my models like this: from django.db import models from django.contrib.auth.models import User class Group(models.Model): name = models.CharField(max_length=200) class UserGroup(models.Model): user = models.ForeignKey(User) group = models.ForeignKey(Group) On a page I have a form field where people can enter a group name. I want the results from this form field to create a UserGroup object for the user - group combination and if the group doesn't yet exist create a new Group object. At first I started putting this logic in the UserGroup class with a add_group method but quickly realized that it doesn't really make sense to put this in the UserGroup class. What would the proper way of doing this be? I saw some stuff about model managers. Is this what those are for?

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• ASP.NET MVC Html.Display() using ViewData?

  - by JK

  When I use Html.DisplayFor() using a property of the model, it comes out nicely with both a label for the property name and a textbox or label with the property value: Html.DisplayFor(model => model.FirstName) // renders as First Name: Joe Smith But if I try to use the same for something that is in ViewData, it doesn't seem to have any way to specify the text that will be used in the label in the rendered html: Html.Display(ViewData["something"].ToString()) // renders as (no label) something The other Html.Display() parameters don't look helpful: Html.Display(ViewData["something"].ToString(), "TemplateName", "HtmlElementId", {additionalData}) It looks like the only place I might pass the label is with the additionalData param, but I haven't found any examples or docs on how to do this.

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• List display names from django models

  - by Ed

  I have an object: POP_CULTURE_TYPES = ( ('SG','Song'), ('MV', 'Movie'), ('GM', 'Game'), ('TV', 'TV'), ) class Pop_Culture(models.Model): name = models.CharField(max_length=30, unique=True) type = models.CharField(max_length=2, choices = POP_CULTURE_TYPES, blank=True, null=True) Then I have a function: def choice_list(request, modelname, field_name): mdlnm = get.model('mdb', modelname.lower()) mdlnm = mdlnm.objects.values_list(field_name, flat=True).distinct().order_by(field_name) return render_to_response("choice_list.html", { 'model' : modelname, 'field' : field_name, 'field_list' : mdlnm }) This gives me a distinct list of all the "type" entries in the database in the "field_list" variable passed in render_to_response. But I don't want a list that shows: SG MV I want a list that shows: Song Movie I can do this on an individual object basis if I was in the template object.get_type_display But how do I get a list of all of the unique "type" entries in the database as their full names for output into a template? I hope this question was clearly described. . .

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• MVC2 Checkbox problem...

  - by BitFiddler

  When I used the html Helper Checkbox, it produces 2 form elements. I understand why this is, and I have no problem with it except: The un-checking of the checkbox does not seem to be in sync with the 'hidden' value. What I mean is that when I have a bunch of checkboxes being generated in a loop: <%=Html.CheckBox("model.MarketCategories[" & i & "].Value", category.Value)%> and the user deselects and checkbox and the category.Value is FALSE, the code being generated is: <input checked="checked" id="model_MarketCategories_0__Value" name="model.MarketCategories[0].Value" type="checkbox" value="true" /> <input name="model.MarketCategories[0].Value" type="hidden" value="false" /> This is wrong since the Value is False the checkbox should NOT be checked. Any ideas why this is happening?

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• VS 2010 and Entity Framework: accessing SQL Server 2000 databases

  - by pcampbell

  Consider a Visual Studio 2010 project whose requirement is to model the data using Entity Framework. The datasource is a SQL Server 2000 database. The first step is creating a new ADO.NET Entity Data Model item. The Entity Data Model Wizard prompts for a Data Connection. When creating a new Connection, you will need to use a provider other than SqlClient. Usually it's SQLOLEDB. The list of data providers only has SqlClient or ".NET Framework Data Provider for SQL Server". Is there a work-around for Visual Studio 2010 to create or use data connections to SQL Server 2000 using the Entity Framework?

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• Sorting deeply nested attributes in Rails

  - by Senthil

  I want to be able to drag and drag App model which is nested under Category model. http://railscasts.com/episodes/196-nested-model-form-part-1 's the Railscast I've tried to follow. Category controller def move params[:apps].each_with_index do |id, index| Category.last.apps.update(['position=?', index+1], ['id=?', Category.last.id]) end render :nothing => true end I'm able to sort Categories with something similar, but since I'm updating an attribute, I'm having trouble. def sort params[:categories].each_with_index do |id, index| Category.update_all(['position=?', index+1], ['id=?', id]) end render :nothing => true end Any help is appreciated.

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• Database design for summarized data

  - by holden

  I have a new table I'm going to add to a bunch of other summarized data, basically to take some of the load off by calculating weekly avgs. My question is whether I would be better off with one model over the other. One model with days of the week as a column with an additional column for price or another model as a series of fields for the DOW each taking a price. I'd like to know which would save me in speed and/or headaches? Or at least the trade off. IE. ID OBJECT_ID MON TUE WED THU FRI SAT SUN SOURCE OR ID OBJECT_ID DAYOFWEEK PRICE SOURCE

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• Why does this render as a list of "System.Web.Mvc.SelectListItem"s?

  - by JMT

  I'm trying to populate a DropDownList with values pulled from a property, and my end result right now is a list of nothing but "System.Web.Mvc.SelectListItem"s. I'm sure there's some minor step I'm omitting here, but for the life of me I can't figure out what it is. The property GET generating the list: public IEnumerable<SelectListItem> AllFoo { get { var foo = from g in Bar orderby g.name select new SelectListItem { Value = g.fooid.ToString(), Text = g.name }; return foo.AsEnumerable(); } } The controller code: public ActionResult Edit(string id) { // n/a code ViewData["fooList"] = new SelectList(g.AllFoo, g.fooid); return View(model); } The view code: <%= Html.DropDownListFor(model => model.fooid, ViewData["fooList"] as SelectList) %>

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• Best way of implementing DropDownList in ASP.NET MVC 2?

  - by Kelsey

  I am trying to understand the best way of implementing a DropDownList in ASP.NET MVC 2 using the DropDownListFor helper. This is a multi-part question. First, what is the best way to pass the list data to the view? Pass the list in your model with a SelectList property that contains the data Pass the list in via ViewData How do I get a blank value in the DropDownList? Should I build it into the SelectList when I am creating it or is there some other means to tell the helper to auto create an empty value? Lastly, if for some reason there is a server side error and I need to redisplay the screen with the DropDownList, do I need to fetch the list values again to pass into the view model? This data is not maintained between posts (at least not when I pass it via my view model) so I was going to just fetch it again (it's cached). Am I going about this correctly?

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• Sumproduct using Django's aggregation

  - by Matthew Rankin

  Question Is it possible using Django's aggregation capabilities to calculate a sumproduct? Background I am modeling an invoice, which can contain multiple items. The many-to-many relationship between the Invoice and Item models is handled through the InvoiceItem intermediary table. The total amount of the invoice—amount_invoiced—is calculated by summing the product of unit_price and quantity for each item on a given invoice. Below is the code that I'm currently using to accomplish this, but I was wondering if there is a better way to handle this using Django's aggregation capabilities. Current Code class Item(models.Model): item_num = models.SlugField(unique=True) description = models.CharField(blank=True, max_length=100) class InvoiceItem(models.Model): item = models.ForeignKey(Item) invoice = models.ForeignKey('Invoice') unit_price = models.DecimalField(max_digits=10, decimal_places=2) quantity = models.DecimalField(max_digits=10, decimal_places=4) class Invoice(models.Model): invoice_num = models.SlugField(max_length=25) invoice_items = models.ManyToManyField(Item,through='InvoiceItem') def _get_amount_invoiced(self): invoice_items = self.invoiceitem_set.all() amount_invoiced = 0 for invoice_item in invoice_items: amount_invoiced += (invoice_item.unit_price * invoice_item.quantity) return amount_invoiced amount_invoiced = property(_get_amount_invoiced)

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• Core Location in iPhone Simulator 3.2 (iPad)

  - by choise

  So, i'm trying to port my app to iPad. I'm using CoreLocation. Apple says the iPad does have Location: Wi-Fi Digital compass Assisted GPS (Wi-Fi + 3G model) Cellular (Wi-Fi + 3G model) so it should be possible to get the position of my ipad (at least with 3g model) about 3km radius would be enought. but it doesnt work in simulator (3.2 ipad) (running 3.1.3 in simulator simulates me cupertino). is there a way to get the position in simulator (3.2 ipad) ? i live in germany and here the ipad isnt released yet, so i cannot test it on my device. thanks!

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• Databinding a ListBox with SelectionMode = Multiple

  - by David Veeneman

  I have a WPF ListBox that I would like to Enable multiple selection in the ListBox, and Databind the ListBox to my view model. These two requirements appear to be incompatible. My view model has an ObservableCollection<T> property to bind to this ListBox; I set up a binding in XAML from the property to the ListBox.SelectedItems property. When I compiled, I got an error saying that the SelectedItems property was read only and could not be set from XAML. Am I binding to the wrong control property? Is there a way to bind a multiple-selection ListBox in XAML to a view model collection property? Thanks for your help.

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• How to page while maintaining the querystring values in ASP.Net Mvc 2

  - by Picflight

  I am using the pager provided by Martijin Boland to implementing paging in my Asp.Net Mvc 2 application. My form uses the GET method to send all parameters to the querystring, it is a search form with several form elements. <% using (Html.BeginForm("SearchResults", "Search", FormMethod.Get)) {%> On the SearchResults View I am trying to implement paging: <div class="pager"> <%= Html.Pager(Model.PageSize, Model.PageNumber, Model.TotalItemCount, new { Request.QueryString })%> </div> The Html.Pager has some overloads which I am not too clear on how to use. The Request.QueryString makes the querystring look like this: http://localhost:1155/Search/SearchResults?QueryString=Distance%3D10%26txtZip%3D%26cb&page=2 Should it not be like this? http://localhost:1155/Search/SearchResults?Distance=20&txtZip=10021&page=2

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• Entity Framework 4 relationship management in POCO Templates - More lazy than FixupCollection?

  - by Joe Wood

  I've been taking a look at EF4 POCO templates in beta 2. The FixupCollection looks fine for maintaining the model correctness after updating the relationship collection property (i.e. product.Orders it would set the order.Product reference ). But what about support for handling the scenario when some of those Order objects are removed from the context? The use-case of maintaining cascading deletes in the in-memory model. The old Typed DataSet model used to do this by performing the query through the container to derive the relationship results. Like the DataSet, this would require a reference to the ObjectContext inside the entity class so that it could query the top-level Order collection. Better support for Separation of Concerns in the ObjectContext would be required. It looks like EF is not suited to this use-case that DataSets did out of the box.... am I right?

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• GetAllUsers - MVC

  - by Jemes

  I’m using the Membership Provider and would like to display a list of all the users and their First Name, Last Name etc using the GetAllUsers function. I'm having trouble understanding how to implement this function in MVC. Has anyone implemented this in MVC or is there an easier way to list all the users in my application? Any help or advise would be really helpful. Controller public ActionResult GetUsers() { var users = Membership.GetAllUsers(); return View(users); } View Model public class GetUsers { [Required] [DisplayName("User name")] public string UserName { get; set; } [Required] [DisplayName("User name")] public string FirstName { get; set; } } View <%= Html.Encode(item.UserName) %> Error The model item passed into the dictionary is of type 'System.Web.Security.MembershipUserCollection', but this dictionary requires a model item of type 'System.Collections.Generic.IEnumerable`1[Account.Models.GetUsers]'.

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• Asking Box2d if a collision happened

  - by Rosarch

  I'm using Box2dx (ported to C#; optimized for XNA). It handles collision resolution, but how can I tell if two objects are currently colliding? This is the function I'm trying to write: public bool IsColliding(GameObjectController collider1, GameObjectController collider2) Where collider1.Model.Body is the Box2d Body, and collider1.Model.BodyDef is the Box2d BodyDef. (The same goes for collider2, of course.) UPDATE: Looks like contact listeners or this could be useful: AABB collisionBox; model.Body.GetFixtureList().GetAABB(out collisionBox); Why does GetFixtureList() return one fixture?

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• How can I use a custom ValidationAttribute to ensure two properties match?

  - by Brandon Linton

  We're using xVal and the standard DataAnnotationsValidationRunner described here to collect validation errors from our domain objects and view models in ASP.NET MVC. I'd like to have a way to have that validation runner identify when two properties don't match through the use of custom DataAnnotations. Right now I'm forced into doing it outside of the runner, this way: if (!(model.FieldOne == model.FieldTwo)) errors.Add(new ErrorInfo("FieldTwo", "FieldOne must match FieldTwo", model.FieldTwo)); My question is: can this be done using property-level validation attributes, or am I forced into using class-level attributes (in which case, I'd have to modify the runner...and my follow up question would be how best to retrieve them in that case). Thanks!

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• How to use Railroad to create a models diagram that show methods

  - by SeeBees

  Railroad is a great UML tool for Ruby on Rails. It can automatically generate class diagrams of models and controllers. For models, a railroad-generated class diagram shows attributes of each model and the associations between one model and another. A sample diagram can be found here. It is very useful for a developer to see attributes and associations of models. While attributes and associations reveal the inner states and relationships of models, methods specify their behaviours. They are all desirable in a class diagram. I would like railroad to generate a class diagram that also lists methods for models, which will help me to know what each model does. I know methods are displayed in a diagram that is generated for controllers, but I don't see such an option for a diagram of models. Does someone know how to do that with railroad? Or is that possible? Thanks!

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• Python decoding issue with hashlib.digest() method

  - by Sorw

  Hello StackOverflow community, Using Google App Engine, I wrote a keyToSha256() method within a model class (extending db.Model) : class Car(db.Model): def keyToSha256(self): keyhash = hashlib.sha256(str(self.key())).digest() return keyhash When displaying the output (ultimately within a Django template), I get garbled text, for example : ?????_??!`?I?!?;?QeqN??Al?'2 I was expecting something more in line with this : 9f86d081884c7d659a2feaa0c55ad015a3bf4f1b2b0b822cd15d6c15b0f00a08 Am I missing something important ? Despite reading several guides on ASCII, Unicode, utf-8 and the like, I think I'm still far from mastering the secrets of string encoding/decoding. After browsing StackOverflow and searching for insights via Google, I figured out I should ask the question here. Any idea ? Thanks !

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• Pylons, SQlite and autoincrementing fields

  - by Maxfrank

  Hey! Just started working with Pylons in conjunction with SQLAlchemy, and my model looks something like this: from sqlalchemy import Column from sqlalchemy.types import Integer, String from helloworld.model.meta import Base class Person(Base): __tablename__ = "person" id = Column(Integer, primary_key=True) name = Column(String(100)) email = Column(String(100)) def __init__(self, name='', email=''): self.name = name self.email = email def __repr__(self): return "<Person('%s')" % self.name To avoid sqlite reusing id's that might have been deleted, I want to add AUTOINCREMENT to the column "id". I've looked through the documentation for sqlalchemy and saw that the sqlite_autoincrement can be issued. An example where this attribute is given can be found here. sqlite_autoincrement seems though to be issued when creating the table itself, and I just wondered how it can be supplied when using a declarative style of the model such as mine.

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• Why i am not able to clear the date input field when i do not need? using jquery

  - by kumar

  I have this code in the view to display datepicker for input type.. $("input[id^='exc-flwup-']").datepicker({ duration: '', showTime: true, constrainInput: true, stepMinutes: 30, stepHours: 1, altTimeField: '', time24h: true, minDate: 0 }); This is my Input Filed in the Fieldset.. <label for="FollowupDate"> Follow-up: <span><input type="text" id="exc-flwup-<%=Model.ExceptionID %>" name="exc-flwup-<%=Model.ExceptionID %>" value="<%=Model.FollowupDate %>" /> </span> Problem Is when I click on the textbox on the UI I can select the date its working fine.. but when I am trying to clear the textbox its not going off its allways showing currect date and time.. Can anybody help me why its i am not able to make clear.. thanks

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• django-admin - how to modify ModelAdmin to create multiple objects at once?

  - by skrobul

  let's assume that I have very basic model class Message(models.Model): msg = models.CharField(max_length=30) this model is registered with admin module: class MessageAdmin(admin.ModelAdmin): pass admin.site.register(Message, MessageAdmin) Currently when I go into the admin interface, after clicking "Add message" I have only one form where I can enter the msg. I would like to have multiple forms (formset perhaps) on the "Add page" so I can create multiple messages at once. It's really annoying having to click "Save and add another" every single time. Ideally I would like to achieve something like InlineModelAdmin but it turns out that you can use it only for the models that are related to the object which is edited. What would you recommend to use to resolve this problem?

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• Unicode issue in Django

  - by Kave

  I seem to have a unicode problem with the deal_instance_name in the Deal model. It says: coercing to Unicode: need string or buffer, __proxy__ found The exception happens on this line: return smart_unicode(self.deal_type.deal_name) + _(u' - Set No.') + str(self.set) The line works if I remove smart_unicode(self.deal_type.deal_name) but why? Back then in Django 1.1 someone had the same problem on Stackoverflow I have tried both the unicode() as well as the new smart_unicode() without any joy. What could I be missing please? class Deal(models.Model): def __init__(self, *args, **kwargs): super(Deal, self).__init__(*args, **kwargs) self.deal_instance_name = self.__unicode__() deal_type = models.ForeignKey(DealType) deal_instance_name = models.CharField(_(u'Deal Name'), max_length=100) set = models.IntegerField(_(u'Set Number')) def __unicode__(self): return smart_unicode(self.deal_type.deal_name) + _(u' - Set No.') + str(self.set) class Meta: verbose_name = _(u'Deal') verbose_name_plural = _(u'Deals') Dealtype: class DealType(models.Model): deal_name = models.CharField(_(u'Deal Name'), max_length=40) deal_description = models.TextField(_(u'Deal Description'), blank=True) def __unicode__(self): return smart_unicode(self.deal_name) class Meta: verbose_name = _(u'Deal Type') verbose_name_plural = _(u'Deal Types')

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• Django - Form validation error

  - by Igor G.

  Hello, I have a model like this: class Entity(models.Model): entity_name = models.CharField(max_length=100) entity_id = models.CharField(max_length=30, primary_key=True) entity_parent = models.CharField(max_length=100, null=True) photo_id = models.CharField(max_length=100, null=True) username = models.CharField(max_length=100, null=True) date_matched_on = models.CharField(max_length=100, null=True) status = models.CharField(max_length=30, default="Checked In") def __unicode__(self): return self.entity_name class Meta: app_label = 'match' ordering = ('entity_name','date_matched_on') verbose_name_plural='Entities' I also have a view like this: def photo_match(request): ''' performs an update in the db when a user chooses a photo ''' form = EntityForm(request.POST) form.save() And my EntityForm looks like this: class EntityForm(ModelForm): class Meta: model = Entity My template's form returns a POST back to the view with the following values: {u'username': [u'admin'], u'entity_parent': [u'PERSON'], u'entity_id': [u'152097'], u'photo_id': [u'2200734'], u'entity_name': [u'A.J. McLean'], u'status': [u'Checked Out'], u'date_matched_on': [u'5/20/2010 10:57 AM']} And form.save() throws this error: Exception in photo_match: The Entity could not be changed because the data didn't validate. I have been trying to figure out why this is happening, but cannot pinpoint the exact problem. I can change my Entities in the admin interface just fine. If anybody has a clue about this I would greatly appreciate it! Thanks, Igor

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