This is sort of odd and I'm sure there is an easy fix.
I have my ModelsBuilder set to Dll and I can do things like #Model.Content.PROPERTY to get the property I wrote in my backoffice. This works fine, but what if I want to loop through all children and use that notation as well? Here's an example:
My document type structure goes like this:
-Projects
-Project
And this is what I want to do:
#foreach(var project in Model.Content.Children) {
<p>#project.Content.PROPERTY</p>
}
I want to do something like that, but the project type is set to an IPublishedContent. I basically want it to be a IPublishedContent<Project> so I can access the model properties directly. This works fine, by the way:
#foreach(var project in Model.Content.Children) {
<p>#project.GetPropertyValue("description")</p>
}
and description is a property on my Project model.
Okay, it was actually rather easy. No clue why I didn't try this before (I didn't expect it to work):
#foreach(Project project in Model.Content.Children) {
<p>#project.Description</p>
}
Works flawlessly. Simply set the type to be the model type.
Related
I've been stuggling for a moment and I'm unable to find anything related to that. I'm a total newbie with Kendo, and sadly I was not able to find anything that could help my question, documentation, forums and all of that : they haven't helped at all.
Situation :
I have a viewmodel in my ASP .NET app. I'm trying to make a chart out of one of the proripeties called "Type". This propriety represent a type of data - let's say fruits, like "Banana", "Apple" etc.
This type contains only and only one type at the time. It cannot contain something like "Apple and bananas". It's always a string, too.
This proriety is part of a larger model. But I'm only interested in this one.
Now, what I like to do :
I'd like to make a chart, using Kendo, from that propriety.
That means, I have to bind my chart to my model, and then, it will be able to know how many time some of those Types were used.
Like, example, If I have three objects :
Name : "Mjuzl"
Type : "Potato"
Name : "Uijqf"
Type : "Apple"
Name : "Zjli"
Type : Potato"
I'd like my char to count that my model used the type Potato twice, and the type Apple once.
I know how to get my datasource that contain all of the objects that use my model. (I have already used Kendo Grid just before but it's so simplier tbh) My issue right now, is that I have no idea - and I wasnt' able to find any - how to actually display what I want in my chart. I say it again, they are strings. I know how to get my datasource. I don't know how to actually show what I want to show. (Should I use columns ? sections ? I don't know)
Do I need to build a JSON from my controller that will ask the database to count ? Does Kendo is able to do it by it's own ? I'm so lost, I have no idea what Kendo is actually waiting for to make my chart working. The documentation isn't helping at all. I've been researching for a while, I haven't found anything that describes the exact same problem. And I've been searching for days.
Very badly drawn image I've done to put a picture on my problem :
I don't ask to do it for me, I ask for a path. A way to do it.
Thanks.
One way would be to create a view model specifically for your chart, and you can populate that view model based on your data.
Roughly (untested code - just to give you an idea), something like this:
public class MyChartViewModel
{
public int TypeCount { get; set; }
public string TypeName { get; set; }
}
and then in your read method for the chart where you are populating MyChartViewModel:
var myExistingDataModel = howeverYouGetYourDataHere;
var model = new MyChartViewModel();
var distinctTypes = myExistingDataModel.Select(x => x.Type).Distinct().ToList();
foreach (var distinctType in distinctTypes)
{
model.TypeCount = myExistingDataModel.Count(x => x.Type == distinctType);
model.TypeName = distinctType;
}
Finally ! I managed to do it !
For any future reference :
Based on G_P's answer, I used a LINQ request to count all of my types : Linq distinct - Count (don't forget to remove the .District() otherwise I won't work !)
Then, I did some debuging to see if I actually return my data, because nothing was showing in the chart. It did return my data and the right number.
The issue for this case was, I use
return Json(types.ToDataSourceResult(request, ModelState));
To return my data to my chart. But ! there is a little thing to know about Chart, they don't work like grids. You have to use a specific setup for showing your data if you use ToDataSourceResult : https://docs.telerik.com/aspnet-mvc/html-helpers/charts/data-binding (See "3) (Optional) Configure a Custom DataSource."), just change the call to your controller, and voilà ! It worked !
I just wasted half a day trying to figure this out, reading about some workarounds, and thinking "it can't be that bad - there must be a straightforward to do edit a collection in Grails, whethere using scaffolded views or my own."
Let's say I have this domain object:
class TreeGroup {
String name
List<Tree> trees
static hasMany = ['trees': MyTree]
}
Just to explain the choice of data structure - I need my records to be unique, but in the order I set. That's why I chose List, AFAIK one cannot rely on order in a Set. So there are 2 pieces to this question - 1) how to remove from any Collection, for example a Set, 2) is List the best replacement for Set in this context (preserving order).
I want to be able to create a group record with no trees in it and make 4 updates:
edit/save
edit the group record to reference 2 trees A and B
add another tree C
remove A
remove B and C
And obviously, I want the desired state after every step. Currently though, I can only add records, and if I even edit/save to list, the list elements are added to it again.
I am using the multiple select tag for this. It looks like this:
<g:select name="trees" from="${allTrees}" optionKey="id"
multiple="true" class="many-to-many"
value="${trees ? trees*.id : treeGroupInstance?.trees*.id}" />
and that's fine, in the sense that it generates an HTTP header with these variables on update:
_method:PUT
version:19
name:d5
trees:1
_action_update:Update
But the data binder only adds new elements, it never lets you edit a list.
What is the cleanest way to do it ? Is it me, not reading something obvious, or is this a design flaw of grails data binding (and of so, when/how will it be fixed) ?
Is there a way perhaps via a hidden HTTP parameter to clear the list before (re)adding elements ?
Thanks
I ended up doing this:
private repopulate(def domainObject, String propertyName, Class domainKlaz) {
if (params[propertyName] != null) {
domainObject[propertyName].clear()
domainObject[propertyName].addAll(
params[propertyName].collect { domainKlaz.get(it) }
)
}
}
and I am calling it in update controller method before save(), for every collection. OMG how ugly.
I develop web part with custom editor part and faced with this question.
Is it possible in web part set Personalizable attribute to generic List?
For example I want something like this:
[WebBrowsable(false)]
[Personalizable(PersonalizationScope.Shared)]
public List<AnnouncementItem> Announcements
{
get { return _announcements; }
set { _announcements = value; }
}
Is it possible, and what kind of types at all can be used as "Personalizable"?
Thanks.
Solution:
I use a custom EditorPart to select multiple lists using AssetUrlSelector, but I need a way to personalize this collection for end user.List<of custom objects> doesn't work, but I found that List<string> (and only string) work perfectly. So, I get required lists in EditorPart and pass their to the web part using List<string>.
Try using a custom EditorPart to add/remove items from the collection. I've never built a web part that personalized a collection so I don't know if it works but I'd definitely try the collection with an EditorPart. If it doesn't work, serialize XML into a string property.
Your question does not seem to match your code. Your code shows a collection of custom objects. I doubt an end user will be able to set such a property. To have a property that points to a generic list, you would probably be better off defining the property as a string that contains the URL to a list.
I'm working on an application at the moment in ASP.NET MVC which has a number of look-up tables, all of the form
LookUp {
Id
Text
}
As you can see, this just maps the Id to a textual value. These are used for things such as Colours. I now have a number of these, currently 6 and probably soon to be more.
I'm trying to put together an API that can be used via AJAX to allow the user to add/list/remove values from these lookup tables, so for example I could have something like:
http://example.com/Attributes/Colours/[List/Add/Delete]
My current problem is that clearly, regardless of which lookup table I'm using, everything else happens exactly the same. So really there should be no repetition of code whatsoever.
I currently have a custom route which points to an 'AttributeController', which figures out the attribute/look-up table in question based upon the URL (ie http://example.com/Attributes/Colours/List would want the 'Colours' table). I pass the attribute (Colours - a string) and the operation (List/Add/Delete), as well as any other parameters required (say "Red" if I want to add red to the list) back to my repository where the actual work is performed.
Things start getting messy here, as at the moment I've resorted to doing a switch/case on the attribute string, which can then grab the Linq-to-Sql entity corresponding to the particular lookup table. I find this pretty dirty though as I find myself having to write the same operations on each of the look-up entities, ugh!
What I'd really like to do is have some sort of mapping, which I could simply pass in the attribute name and get out some form of generic lookup object, which I could perform the desired operations on without having to care about type.
Is there some way to do this to my Linq-To-Sql entities? I've tried making them implement a basic interface (IAttribute), which simply specifies the Id/Text properties, however doing things like this fails:
System.Data.Linq.Table<IAttribute> table = GetAttribute("Colours");
As I cannot convert System.Data.Linq.Table<Colour> to System.Data.Linq.Table<IAttribute>.
Is there a way to make these look-up tables 'generic'?
Apologies that this is a bit of a brain-dump. There's surely imformation missing here, so just let me know if you'd like any further details. Cheers!
You have 2 options.
Use Expression Trees to dynamically create your lambda expression
Use Dynamic LINQ as detailed on Scott Gu's blog
I've looked at both options and have successfully implemented Expression Trees as my preferred approach.
Here's an example function that i created: (NOT TESTED)
private static bool ValueExists<T>(String Value) where T : class
{
ParameterExpression pe = Expression.Parameter(typeof(T), "p");
Expression value = Expression.Equal(Expression.Property(pe, "ColumnName"), Expression.Constant(Value));
Expression<Func<T, bool>> predicate = Expression.Lambda<Func<T, bool>>(value, pe);
return MyDataContext.GetTable<T>().Where(predicate).Count() > 0;
}
Instead of using a switch statement, you can use a lookup dictionary. This is psuedocode-ish, but this is one way to get your table in question. You'll have to manually maintain the dictionary, but it should be much easier than a switch.
It looks like the DataContext.GetTable() method could be the answer to your problem. You can get a table if you know the type of the linq entity that you want to operate upon.
Dictionary<string, Type> lookupDict = new Dictionary<string, Type>
{
"Colour", typeof(MatchingLinqEntity)
...
}
Type entityType = lookupDict[AttributeFromRouteValue];
YourDataContext db = new YourDataContext();
var entityTable = db.GetTable(entityType);
var entity = entityTable.Single(x => x.Id == IdFromRouteValue);
// or whatever operations you need
db.SubmitChanges()
The Suteki Shop project has some very slick work in it. You could look into their implementation of IRepository<T> and IRepositoryResolver for a generic repository pattern. This really works well with an IoC container, but you could create them manually with reflection if the performance is acceptable. I'd use this route if you have or can add an IoC container to the project. You need to make sure your IoC container supports open generics if you go this route, but I'm pretty sure all the major players do.
I am using ASP.NET-MVC and nHibernate for the first time. Great tools, but big learning curve!
I have a list view of objects that are quite large (each has about 60 properties). In the list view I am only using about 10 of these properties. Performance is not too bad, but it seems a waste to fully hydrate these objects. What is the recommended practice?
I tried using HQL to select fewer properties, but it seems like it won't partially hydrate an object. I also tried making property on the main object that was a header class with the list view properties, but I couldn't seem to get it mapped properly. I think this should be easy but I've really been struggling with it.
EDIT:
I kept coming back to this because I knew Anton had given me the answer and I just couldn't see it.
There are three things you need to do:
Make an object with the properties you want.
Make a mapping file to import this object.
<hibernate-mapping
xmlns="urn:nhibernate-mapping-2.2"
namespace="Core.Entities"
assembly="Core"
default-access="property">
<import class="RequestHeader" />
</hibernate-mapping>
If you are using HQL, your object must contain a constructor with all the properties, in the same order, as your select new statement. If you use the Criteria API, you don't need to do this.
public IList<RequestHeader> ListAll()
{
using (ISession session = GetSession())
{
using (ITransaction tx = session.BeginTransaction())
{
IList<RequestHeader> results = session.CreateCriteria(typeof (Request), "r")
.CreateCriteria("Requestor", "req", JoinType.InnerJoin)
.CreateCriteria("r.Grant", "g", JoinType.InnerJoin)
.SetProjection(Projections.ProjectionList()
.Add(Projections.Property("r.Id"), "Id")
.Add(Projections.Property("r.Status"), "Status")
.Add(Projections.Property("r.SubmissionDate"), "SubmissionDate")
.Add(Projections.Property("req.Name"), "Requestor")
.Add(Projections.Property("g.Number"), "Number"))
.SetResultTransformer(Transformers.AliasToBean(typeof (RequestHeader)))
.SetMaxResults(10000)
.List<RequestHeader>();
tx.Commit();
return results;
}
}
}
60 properties is too much. See Component mapping.
As for selecting a subset of properties, see this: you need a select new HQL construct. Be aware, though, that you need an appropriate constructor and that an object you'll get cannot be saved back to the DB.