public void UpdateCrawlers(ICollection <RssCrawler> crawlers)
{
var existingCrawlers = _rssCrawlerGateway.Select();
var dataRecs = Mapper.Map <ICollection <Data.Models.RssCrawler> >(crawlers);
var comparer = new Func <Data.Models.RssCrawler, Data.Models.RssCrawler, bool>((x, y) => x.RssCrawlerId == y.RssCrawlerId);
CollectionMergeHelper.MergeNewAndOld(
newItems: dataRecs,
existingItems: existingCrawlers,
comparer: comparer,
create: (x) =>
{
int id = _rssCrawlerGateway.Insert(x);
var dataFilters = Mapper.Map <ICollection <Data.Models.RssCrawlerFilter> >(
crawlers.Single(y => x.RssCrawlerId == y.RssCrawlerId).Filters);
foreach (var filter in dataFilters)
{
filter.RssCrawlerId = id;
_rssCrawlerFilterGateway.Insert(filter);
}
},
update: (x) =>
{
_rssCrawlerGateway.Update(x);
var filters = _rssCrawlerFilterGateway.SelectByRssCrawler(x.RssCrawlerId);
var dataFilters = Mapper.Map <ICollection <Data.Models.RssCrawlerFilter> >(
crawlers.Single(y => x.RssCrawlerId == y.RssCrawlerId).Filters);
foreach (var filter in filters)
{
_rssCrawlerFilterGateway.Delete(filter.RssCrawlerFilterId);
}
foreach (var filter in dataFilters)
{
filter.RssCrawlerId = x.RssCrawlerId;
_rssCrawlerFilterGateway.Insert(filter);
}
//вместо добавления и удаления можно сделать ещё один мёрдж
},
delete: (x) =>
{
_rssCrawlerGateway.Delete(x.RssCrawlerId);
// фильтры выпилятся сами
return(true);
}
);
}
public void MergeTest()
{
var oldCollection = new List <TestClass>()
{
new TestClass()
{
Id = 1, Data = "first"
},
new TestClass()
{
Id = 2, Data = "second"
},
new TestClass()
{
Id = 3, Data = "third"
},
new TestClass()
{
Id = 10, Data = "tenth"
},
new TestClass()
{
Id = 100, Data = "hundredth"
},
};
var newCollection = new List <TestClass>()
{
new TestClass()
{
Id = 1, Data = "firstNew"
},
new TestClass()
{
Id = 3, Data = "thirdNew"
},
new TestClass()
{
Id = 4, Data = "fourthNew"
},
};
var resultCollection = oldCollection.ToList();
//bool Comparer(TestClass x, TestClass y)
//{
// return x.Id == y.Id;
//}
var comparer = new Func <TestClass, TestClass, bool>((x, y) => x.Id == y.Id);
int inserts = 0;
int updates = 0;
int deletes = 0;
CollectionMergeHelper.MergeNewAndOld(
newItems: newCollection,
existingItems: oldCollection,
comparer: comparer,
create: x =>
{
resultCollection.Add(x);
inserts++;
},
update: (x) =>
{
resultCollection.Single(y => comparer(x, y)).Data = x.Data;
updates++;
},
delete: @class =>
{
deletes++;
return(resultCollection.Remove(@class));
});
Assert.AreEqual(resultCollection.Count, 3);
Assert.AreEqual(resultCollection.Single(x => x.Id == 1).Data, "firstNew");
Assert.IsNull(resultCollection.SingleOrDefault(x => x.Id == 2));
Assert.AreEqual(resultCollection.Single(x => x.Id == 3).Data, "thirdNew");
Assert.AreEqual(resultCollection.Single(x => x.Id == 4).Data, "fourthNew");
}