[英]Filter navigation property EF core
In my repository I try to filter the products with the variants active but I do not know how because is first time.在我的存储库中,我尝试过滤具有激活变体的产品,但我不知道如何,因为这是第一次。 I should return all products with or without variants active我应该退回所有有或没有变体的产品
public async Task<IEnumerable<Articolo>> GetArticoliByDivisioneAsync(string divisione)
{
return await _ctx.Articoli
.Where(a => a.Divisione == divisione
&& a.Category!= "001")
.Include(i => i.Varianti)
.Include(i => i.FotoArticoli)
.ToListAsync();
}
The field I want to filter on is in Varianti
.我要过滤的字段在Varianti
。
How can do .Where(v => v.Active == 1)
? .Where(v => v.Active == 1)
怎么办?
Just add your filter to where
Method只需将您的过滤器添加到where
方法
public async Task<IEnumerable<Articolo>> GetArticoliByDivisioneAsync(string divisione)
{
return await _ctx.Articoli
.Where(a => a.Divisione == divisione
&& a.Category!= "001"
&& a.Varianti.Any(v=>v.Active == 1))
.Include(i => i.Varianti)
.Include(i => i.FotoArticoli)
.ToListAsync();
}
if you don't need the value of Varianti
you can remove include part如果您不需要Varianti
的值,您可以删除包含部分
public async Task<IEnumerable<Articolo>> GetArticoliByDivisioneAsync(string divisione)
{
return await _ctx.Articoli
.Where(a => a.Divisione == divisione
&& a.Category!= "001"
&& a.Varianti.Any(v=>v.Active == 1))
.Include(i => i.FotoArticoli)
.ToListAsync();
}
Add to Where()
clause and use Any()
:添加到Where()
子句并使用Any()
:
return await _ctx.Articoli
.Include(i => i.Varianti)
.Include(i => i.FotoArticoli)
.Where(a => a.Divisione == divisione
&& a.Category!= "001"
&& a => a.Varianti.Any(v => v.Active == 1))
.ToListAsync();
To get all products with active variants need to make a projection to new article object and there filter variants要获得所有具有活动变体的产品,需要对新文章对象进行投影并过滤变体
This is the solution这是解决方案
public async Task<IEnumerable<Articolo>> GetArticoliByDivisioneAsync(string divisione)
{
return await _ctx.Articoli
.Where(a => a.Divisione == divisione
&& a.Category!= "001")
.Include(i => i.Varianti)
.Include(i => i.FotoArticoli)
.Select(x => new Articolo
{
Codice = x.Codice ,
Prezzo = x.Prezzo ,
Varianti = x.Varianti.Where(v => v.attivo== 0).ToList(),
FotoArticoli = x.FotoArticoli
})
.ToListAsync();
}
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