Thanks for previous replies,
I am new to magento framework. can anyone guide me how to get the return values from model to controller. in simple i want to return the values from model folder to controller action.
I think this will do what you want
$collection = Mage::getModel('<module>/<module>')->getCollection();
<module> represents model name
In Magento, controller sets values on Models, then Blocks and templates reads them from the those Models. For example, we can set a string hello by using core/session model
Mage::getSingleton('core/session')->setHello('hello');
Then we can get this hello from a block or a template or anywhere else by
Mage::getSingleton('core/session')->getHello();
Related
In ASP.NET, when I want to send a list of model instances to view layer, I convert them into another type (ModelView) by the following code:
var userViewModels = users.select(new {
Name = Name,
UserName = Username
});
I do this because I don't want to send all of my user model data (like password) to view layer. I put this code in my business logic Layer.
I'm using AJAX, and I'm sending my data by JSON protocol. What is the best practice in Ruby on Rails to do a similar action?
In RoR you simply pass models to your views.
Also, view in RoR can directly access (though it's not recommended) models from database. So "hiding" models does not make sense here.
You can consider rails generated scaffold as a close to the best practices.
Controller is used for selecting models from database
View is used for rendering model to the user
Model is the main place to store business logic
Although it is probably unnecessary, as dimakura pointed out, you can select arbitrary attributes when finding by using the select method. Your example would end up looking something like:
#users = User.select(:name, :username)
My website is built around tabs. I have one single page with multiple partial views that display each tab.
The problem im facing now is I want to loop through files that the user has uploaded and display them in one of my partial views. This requires me to send the file list as a paramater in my action like this:
//Uploadedfiles is a function that adds the files to a list.
var files = UploadedFiles();
return View(files);
Because im only using one view to display all my partial views, i get:
The model item passed into the dictionary is of type 'Microsoft.WindowsAzure.Storage.Core.Util.CommonUtility+d__0`1[Delamapp.CloudStorageServices.UploadEntity]', but this dictionary requires a model item of type 'Delamapp.Models.LoginFolder'.
This means im required to not send a model item to my index view. Now, the only thing i can think off is adding my file list to viewbag and then display them on my view. BUT.. The files require high security. How safe is viewbag? Can you for example store sensitive login information in there? Can you think off some other way to accomplish this?
Thank you in advance
You can pass a model item to your view, but the model item you are passing doesn't match the type of model that your view uses (that's what the error message says).
So you need to do one of the following:
Modify your view to accept the model type that you are passing to it
Put the data you want to pass into the model type that your view is expecting
Create a new model type for both your data and for the view, and use that
In terms of security, I don't think using a view bag versus model binding really enters into the question of security. Both are just ways of passing data in between the controller and the view, and that all takes place within the ASP.NET process (perhaps you have ViewBag confused with Web Forms' ViewState?).
I have a view that is using a model
Inherits="System.Web.Mvc.ViewPage<Program.Models.Test>"
I am displaying data in the view using:
> <%= this.Model.Item == null ? "" :
> Html.GetString(this.Model.Item.Name) %>
Now I am trying to display a different item from another model on the same view, I thought ViewBag might help, so in my controler, I added:
ViewBag.GuideLines = ctx.GuideLines;
My question is can I display a specific item value from Guidelines model on the same view?
Thanks in advance.
I thought ViewBag might help
Wrong thought. ViewBag/ViewData never helps. I never use those 2 in any ASP.NET MVC application.
Now I am trying to display a different item from another model on the same view
Simply add this other model as property of the main view model. So you will have Model.Guidelines in the view.
in general if you need to use one or more of your domain models for use in a single page, you would create a viewmodel, basically a POCO that would contain just the properties from your domain objects (or any other information) that your view would need to be aware of. you would then strongly ype your view to this new viewmodel type and access the properties as per normal.
I have an action that depends on a list of integers. My first instinct was to simply declare the action with a List.
I tried declaring the action in the controller as:
public ActionResult EditMultiple(List<int> ids)
and in my View call like so:
<%= Html.ActionLink("EditMultiple", "EditMultiple", new { ids = new List<int> {2, 2, 2} })%>
Although it compiles the List is empty when I put a breakpoint in the action. Anybody know why or have an alternate approach?
Adding more detail about the scenario:
I'm trying to "Edit" multiple entities at the same time. I'm already at the point where I have an application that allows me to create/edit/view information about books in a library. I have a partial view that allows the user to edit information about a single book and save it to the database.
Now I'd like to create a View which allows the user to edit the information about multiple books with a single submit button. I've created an action EditMultiple which just renders the partial for each book (my model for this view is List) and adds the submit button afterwards.
Yes. The default model binder can bind "ids" to any ICollection. But you have to submit multiple parameters with the same name. That eliminates using the helper method "ActionLink". You can use url helper Action and append the ids to the link like so:
Test link
Here's the link from Haack's block.
I dont think
new List<int> {2, 2, 2}
gets properly converted into an POST that is bindable, you want to send
Ids=1&Ids=2&Ids=3
a comma separate list may also work, im not sure, i don't use the crappy default modelbinder.
Why are you doing that anyway? I hope thats pseudocode for something else...
I'm wondering how you keep a constant value of the Model in an ASP.NET MVC framework. Like when adding something to the Model through the view. You go back to an action in the controller but where do you keep the Model? Is it a private in the controller? or is it passed back and forth from the view to the controller because if it gets big then you are passing alot of data back and forth to add/delete a single item from the Model.
Also any small examples to show this?
Thanks
What are you referring to? Are you meaning a database table loaded up into an object such as Ruby on Rails's ORM -- typically the 'Model' is a series of interfaces or domain objects that load data into objects from the database .. or more simply just the database period.
Please be more specific. There are many MVC frameworks and many different kinds of 'Models'
I think you should check out a ASP.NET MVC tuturial like NerdDinner (from "Professional ASP.NET MVC 1.0"). Scott Guthrie has posted a html version of the tutorial on his site. It's a fairly simple site that they build in the tutorial, and is a great intro to ASP.NET MVC (in my opinion).
There are also some good tutorials on the ASP.NET site.
Hope these help you with .NET MVC, it's a great framework to use!
You can pass the model to the page and you can then use UpdateModel(model name) within your controller.
Each member in the model must be a property with a getter and a setter.
On the page you can hold the data in say a hidden field if you need to maintain the value outside of state.
If you have problems using UpdateModel then you can use the following in your controller;
[AcceptVerbs(HttpVerbs.Post)]
public ActionResult MyAction(int? id, FormCollection collection)
{
string commentText = collection["myFieldName"];
}
This will normally get your values from the model.
Hope this is what you were asking.
Think of the model as a data transfer object. In a list, display only or edit page, you pull it out of a data layer as a single object or a list of objects. The controller passes it along to the view and it gets displayed.
In the case of an insert, a new data transfer object is instantiated upon post back and is updated with the posted values. Then sent back to the the data layer for persistence.
In the case of an edit, it comes from the data layer on the HTTP GET request and is used to pre-populate the HTML form. Then on post back, the data transfer object gets updated with the posted values and sent back to the the data layer for persistence.
Definitely checkout NerdDinner or Stephen Walther's samples.