NopCommerce 2.5
I want to sort the products on the home page on the display order given in Admin/Category/Edit/... but I can't find the table that the display order is held in. I have the query in Nop.Services\Catalog\ProductService.cs and I guess I need to set up a Join here but with which table???.
public virtual IList<Product> GetAllProductsDisplayedOnHomePage()
{
var query = from p in _productRepository.Table
orderby p.Name
where p.Published &&
!p.Deleted &&
p.ShowOnHomePage
select p;
var products = query.ToList();
return products;
}
Can someone point me in the right direction, or even better fill in the gaps?
I guess this is quite late but...
No way to modify the default order. In the code above you see the "ORDER BY Name" is hardcoded. This is a big flaw of nopCommerce. There's no table or field that stores the DisplayOrder on HomePage, because there's no HomePage <-> Product relation at all, it's just a switch: it's either ON or OFF.
Related
in typo3 tt_content the field sorting doesn't show the real order of the elements of a page. Is there any possibility to reorder it, to refresh it?
I want in a selection the bodytext and image of the first Contentelement (textpic) of a page.
Thanks
Volker
I don't really get your question but the order is correct in the backend, however you need to have some things in mind
the sorting depends on the page (field pid), so you can't compare sorting over multiple plages
The field colPos is also important as sorting is unique per column
I got the problem. In my installation in the tt_content is not updating the field "sorting" after a clean installation the problem is solved.
Thanks
Volker
A try of a concrete answer to a vague question:
lib.someContent = CONTENT
lib.someContent {
table = tt_content
select {
where = colPos=0
orderBy = sorting
languageField = sys_language_uid
begin = 0
max = 1
}
}
I have been trying for hours to get a Distinct to work for my code.
I am using EF 4.3, MVC3, Razor and trying to get a list downto product id and name.
When I run the Sql query against the DB, it's fine.
Sql Query is
SELECT DISTINCT [ProductId]
,[Product_Name]
FROM [dbo].[PRODUCT]
The only other column in that table is a country code so that's why a standard distinct() isn't working.
I have gone as far as creating an IEqualityComparer
Here is code:
public class DistinctProduct : IEqualityComparer<PRODUCT>
{
public bool Equals(PRODUCT x, PRODUCT y)
{
return x.ProductId.Equals(y.ProductId);
}
public int GetHashCode(PRODUCT obj)
{
return obj.ProductId.GetHashCode();
}
}
here is where I called it.
IEqualityComparer<PRODUCT> customComparer = new DistinctProduct();
IEnumerable<PRODUCT> y = db.PRODUCTs.Distinct(customComparer);
But when it hit's that Last line I get an error out of it stating...
LINQ to Entities does not recognize the method 'System.Linq.IQueryable`1[MyService.Models.PRODUCT] Distinct[PRODUCT](System.Linq.IQueryable`1[MyService.Models.PRODUCT], System.Collections.Generic.IEqualityComparer`1[MyService.Models.PRODUCT])' method, and this method cannot be translated into a store expression.
Can anyone tell me what I'm doing wrong?
Thanks,
David
Is there any reason you could just not use a distinct like the following?
var distinctProdcts = (from p in db.PRODUCTs
select new {
ProductId = p.ProductId,
Product_Name = p.ProductName
}).Distinct();
This would remove the country code from the query before you do the distinct.
Entity Framework is trying to translate your query to a SQL query. Obviously it does not know how to translate the IEqualityComparerer. I think the question is whether you want to do the Distinct in the datbase (in which case your client gets only filtered results) or you are OK with bringing all the data to the client and select distinct on the client. If you want the filtering to happen on the database side (which will make your app perform much better) and you want to be able to use different strategies for comparing you can come up with a code that builds distinct criteria on top of your query. If you are fine with bringing your data to the client (note that it can be a lot of data) you should be able just to do (.ToList() will trigger querying the database and materializing results):
IEnumerable<PRODUCT> y = db.PRODUCTs.ToList().Distinct(customComparer);
I'm a total LINQ noob so I guess you'll probably have a good laugh reading this question. I'm learning LINQ to create queries in LightSwitch and what I don't seem to understand is to select an entity based on a value in a lookup table. Say I want to select all employees in a table that have a job title that is picked from a related lookup table. I want the descriptive value in the lookup table for the user to pick from a list to use as a parameter in a query, not the non-descriptive id's.
Can someone point me to an article or tutorial that quickly explains this, or give me a quick answer? I AM reading books and have a Pluralsight account but since this is probably the most extensive knowledge I will need for now a simple tutorial would help me more that watching hours of videos and read thousands of pages of books.
Thanks in advance!
Edit: this is the code. As far as I know this should but won't work (red squigly line under EmployeeTitle, error says that EmployeeContract does not contain a definition for EmployeeTitle even though there is a relationship between the two).
partial void ActiveEngineers_PreprocessQuery(ref IQueryable<Employee> query)
{
query = from Employee e in query
where e.EmployeeContract.EmployeeTitle.Description == "Engineer"
select e;
}
Edit 2: This works! But why this one and not the other?
partial void ActiveContracts_PreprocessQuery(ref IQueryable<EmployeeContract> query)
{
query = from EmployeeContract e in query
where e.EmployeeTitle.Description == "Engineer"
select e;
}
The red squiggly line you've described is likely because each Employee can have 1-to-many EmployeeContracts. Therefore, Employee.EmployeeContracts is actually an IEnumerable<EmployeeContract>, which in turn does not have a "EmployeeTitle" property.
I think what you're looking for might be:
partial void ActiveEngineers_PreprocessQuery(ref IQueryable<Employee> query)
{
query = from Employee e in query
where e.EmployeeContract.Any(x => x.EmployeeTitle.Description == "Engineer")
select e;
}
What this is saying is that at least one of the Employee's EmployeeContracts must have an EmployeeTitle.Description == "Engineer"
Try something like this:
partial void RetrieveCustomer_Execute()
{
Order order = this.DataWorkspace.NorthwindData.Orders_Single
(Orders.SelectedItem.OrderID);
Customer cust = order.Customer;
//Perform some task on the customer entity.
}
(http://msdn.microsoft.com/en-us/library/ff851990.aspx#ReadingData)
Assuming you have navigation properties in place for the foreign key over to the lookup table, it should be something like:
var allMonkies = from employee in context.Employees
where employee.EmployeeTitle.FullTitle == "Code Monkey"
select employee;
If you don't have a navigation property, you can still get the same via 'manual' join:
var allMonkies = from employee in context.Employees
join title in context.EmployeeTitles
on employee.EmployeeTitleID equals title.ID
where title.FullTitle == "Code Monkey"
select employee;
I want to do the following...
FROM o IN orders
SELECT new OrderContainer { Contact = (PostalContact) o.Contact }
So hopefully you can see that the order's 'Contact' will be of a derived type. Unfortunately however it doesn't seem to do a polymorphic fetch! Is there anyway of achieving this?
Cheers, Ian.
Try using the extention method .OfType()
from o in orders
select new OrderContainer { Contact = o.Contact.OfType<PostalContact>().FirstOrDefault() }
Edit:
a way to get the full object data, but i doubt that this is good enough for your needs.
from c in contacts.OfType<PostalContact>()
where c.Orders.Any(o=>o.Contact.Id == c.id)
select new OrderContainer { Contact = c }
on the other hand, if you set the base class (entity) to abstract, you may find that entity will load the full objects. but this is not recomended due to the queries that are generated. if you are looking into this you may want to look at (TPH) Table per Hierarchy for your contacts
Ok this should be really simple, but I am doing my head in here and have read all the articles on this and tried a variety of things, but no luck.
I have 3 tables in a classic many-to-many setup.
ITEMS
ItemID
Description
ITEMFEATURES
ItemID
FeatureID
FEATURES
FeatureID
Description
Now I have a search interface where you can select any number of Features (checkboxes).
I get them all nicely as an int[] called SearchFeatures.
I simply want to find the Items which have the Features that are contained in the SearchFeatures.
E.g. something like:
return db.Items.Where(x => SearchFeatures.Contains(x.ItemFeatures.AllFeatures().FeatureID))
Inside my Items partial class I have added a custom method Features() which simply returns all Features for that Item, but I still can't seem to integrate that in any usable way into the main LINQ query.
Grr, it's gotta be simple, such a 1 second task in SQL. Many thanks.
The following query will return the list of items based on the list of searchFeatures:
from itemFeature in db.ItemFeatures
where searchFeatures.Contains(itemFeature.FeatureID)
select itemFeature.Item;
The trick here is to start with the ItemFeatures table.
It is possible to search items that have ALL features, as you asked in the comments. The trick here is to dynamically build up the query. See here:
var itemFeatures = db.ItemFeatures;
foreach (var temp in searchFeatures)
{
// You will need this extra variable. This is C# magic ;-).
var searchFeature = temp;
// Wrap the collection with a filter
itemFeatures =
from itemFeature in itemFeatures
where itemFeature.FeatureID == searchFeature
select itemFeature;
}
var items =
from itemFeature in itemFeatures
select itemFeature.Item;