public void FindSortableMember()
{
Assert.Null(EFSorting.FindSortableMember(typeof(TestClass_Base)));
Assert.Equal("Key", EFSorting.FindSortableMember(typeof(TestClass_LikelyKey)));
Assert.Equal("Key", EFSorting.FindSortableMember(typeof(TestClass_Field)));
Assert.Equal("Sortable", EFSorting.FindSortableMember(typeof(TestClass_OtherSortable)));
Assert.Equal("Sortable", EFSorting.FindSortableMember(typeof(TestClass_Nullable)));
// see https://msdn.microsoft.com/en-us/library/jj679962(v=vs.113).aspx#Anchor_1
Assert.Equal("ID", EFSorting.FindSortableMember(typeof(TestClass_CodeFirstConv1)));
Assert.Equal("TestClass_CodeFirstConv2Id", EFSorting.FindSortableMember(typeof(TestClass_CodeFirstConv2)));
Assert.Null(EFSorting.FindSortableMember(typeof(TestClass_CodeFirstConv_InvalidType)));
}
public LoadResult Load() {
if(Options.IsCountQuery)
return new LoadResult { totalCount = ExecCount() };
var result = new LoadResult();
if(CanUseRemoteGrouping && ShouldEmptyGroups) {
var groupingResult = ExecRemoteGrouping();
EmptyGroups(groupingResult.Groups, Options.Group.Length);
result.data = Paginate(groupingResult.Groups, Options.Skip, Options.Take);
result.summary = groupingResult.Totals;
result.totalCount = groupingResult.TotalCount;
if(Options.RequireGroupCount)
result.groupCount = groupingResult.Groups.Count();
} else {
if(!Options.HasPrimaryKey)
Options.PrimaryKey = Utils.GetPrimaryKey(typeof(S));
if(!Options.HasPrimaryKey && (Options.Skip > 0 || Options.Take > 0) && Compat.IsEntityFramework(Source.Provider))
Options.DefaultSort = EFSorting.FindSortableMember(typeof(S));
var deferPaging = Options.HasGroups || !CanUseRemoteGrouping && !SummaryIsTotalCountOnly && Options.HasSummary;
var loadExpr = Builder.BuildLoadExpr(Source.Expression, !deferPaging);
if(Options.HasAnySelect) {
ContinueWithGrouping(
ExecWithSelect(loadExpr).Select(ProjectionToDict),
Accessors.Dict,
result
);
} else {
ContinueWithGrouping(
ExecExpr<S>(Source, loadExpr),
new DefaultAccessor<S>(),
result
);
}
if(deferPaging)
result.data = Paginate(result.data, Options.Skip, Options.Take);
if(ShouldEmptyGroups)
EmptyGroups(result.data, Options.Group.Length);
}
return result;
}
public static object Load <T>(IQueryable <T> source, DataSourceLoadOptionsBase options)
{
var isLinqToObjects = source is EnumerableQuery;
var builder = new DataSourceExpressionBuilder <T>(options, isLinqToObjects);
if (options.IsCountQuery)
{
return(builder.BuildCountExpr().Compile()(source));
}
var accessor = new DefaultAccessor <T>();
var result = new DataSourceLoadResult();
var emptyGroups = options.HasGroups && !options.Group.Last().GetIsExpanded();
var canUseRemoteGrouping = options.RemoteGrouping.HasValue ? options.RemoteGrouping.Value : !isLinqToObjects;
if (canUseRemoteGrouping && emptyGroups)
{
var groupingResult = ExecRemoteGrouping(source, builder, options);
EmptyGroups(groupingResult.Groups, options.Group.Length);
result.data = Paginate(groupingResult.Groups, options.Skip, options.Take);
result.summary = groupingResult.Totals;
result.totalCount = groupingResult.TotalCount;
if (options.RequireGroupCount)
{
result.groupCount = groupingResult.Groups.Count();
}
}
else
{
if (!options.HasPrimaryKey)
{
options.PrimaryKey = Utils.GetPrimaryKey(typeof(T));
}
if (!options.HasPrimaryKey && (options.Skip > 0 || options.Take > 0) && Compat.IsEntityFramework(source.Provider))
{
options.DefaultSort = EFSorting.FindSortableMember(typeof(T));
}
var deferPaging = options.HasGroups || options.HasSummary && !canUseRemoteGrouping;
var queryResult = ExecQuery(builder.BuildLoadExpr(!deferPaging).Compile(), source, options);
IEnumerable data = queryResult;
if (options.HasGroups)
{
data = new GroupHelper <T>(accessor).Group(queryResult, options.Group);
if (options.RequireGroupCount)
{
result.groupCount = (data as IList).Count;
}
}
if (canUseRemoteGrouping && options.HasSummary && !options.HasGroups)
{
var groupingResult = ExecRemoteGrouping(source, builder, options);
result.totalCount = groupingResult.TotalCount;
result.summary = groupingResult.Totals;
}
else
{
if (options.RequireTotalCount)
{
result.totalCount = builder.BuildCountExpr().Compile()(source);
}
if (options.HasSummary)
{
data = Buffer <T>(data);
result.summary = new AggregateCalculator <T>(data, accessor, options.TotalSummary, options.GroupSummary).Run();
}
}
if (deferPaging)
{
data = Paginate(data, options.Skip, options.Take);
}
if (emptyGroups)
{
EmptyGroups(data, options.Group.Length);
}
result.data = data;
}
if (result.IsDataOnly())
{
return(result.data);
}
return(result);
}
public LoadResult Load()
{
if (Options.IsCountQuery)
{
return new LoadResult {
totalCount = ExecCount()
}
}
;
var result = new LoadResult();
if (CanUseRemoteGrouping && ShouldEmptyGroups)
{
var groupingResult = ExecRemoteGrouping();
EmptyGroups(groupingResult.Groups, Options.Group.Length);
result.data = Paginate(groupingResult.Groups, Options.Skip, Options.Take);
result.summary = groupingResult.Totals;
result.totalCount = groupingResult.TotalCount;
if (Options.RequireGroupCount)
{
result.groupCount = groupingResult.Groups.Count();
}
}
else
{
if (!Options.HasPrimaryKey)
{
Options.PrimaryKey = Utils.GetPrimaryKey(typeof(S));
}
if (!Options.HasPrimaryKey && !Options.HasDefaultSort && (Options.Skip > 0 || Options.Take > 0))
{
if (Compat.IsEntityFramework(Source.Provider))
{
Options.DefaultSort = EFSorting.FindSortableMember(typeof(S));
}
else if (Compat.IsXPO(Source.Provider))
{
Options.DefaultSort = "this";
}
}
var deferPaging = Options.HasGroups || !CanUseRemoteGrouping && !SummaryIsTotalCountOnly && Options.HasSummary;
var loadExpr = Builder.BuildLoadExpr(Source.Expression, !deferPaging);
if (Options.HasAnySelect)
{
ContinueWithGrouping(
ExecWithSelect(loadExpr).Select(ProjectionToExpando),
result
);
}
else
{
ContinueWithGrouping(
ExecExpr <S>(Source, loadExpr),
result
);
}
if (deferPaging)
{
result.data = Paginate(result.data, Options.Skip, Options.Take);
}
if (ShouldEmptyGroups)
{
EmptyGroups(result.data, Options.Group.Length);
}
}
return(result);
}
IEnumerable <AnonType> ExecWithSelect(Expression loadExpr)
{
if (Options.UseRemoteSelect)
{
return(ExecExpr <AnonType>(Source, loadExpr));
}
var inMemoryQuery = ForceExecution(ExecExpr <S>(Source, loadExpr)).AsQueryable();
var selectExpr = new SelectExpressionCompiler <S>(true).Compile(inMemoryQuery.Expression, Options.GetFullSelect());
return(ExecExpr <AnonType>(inMemoryQuery, selectExpr));
}
void ContinueWithGrouping <R>(IEnumerable <R> loadResult, LoadResult result)
{
var accessor = new DefaultAccessor <R>();
if (Options.HasGroups)
{
var groups = new GroupHelper <R>(accessor).Group(loadResult, Options.Group);
if (Options.RequireGroupCount)
{
result.groupCount = groups.Count;
}
ContinueWithAggregation(groups, accessor, result);
}
else
{
ContinueWithAggregation(loadResult, accessor, result);
}
}
void ContinueWithAggregation <R>(IEnumerable data, IAccessor <R> accessor, LoadResult result)
{
if (CanUseRemoteGrouping && !SummaryIsTotalCountOnly && Options.HasSummary && !Options.HasGroups)
{
var groupingResult = ExecRemoteGrouping();
result.totalCount = groupingResult.TotalCount;
result.summary = groupingResult.Totals;
}
else
{
var totalCount = -1;
if (Options.RequireTotalCount || SummaryIsTotalCountOnly)
{
totalCount = ExecCount();
}
if (Options.RequireTotalCount)
{
result.totalCount = totalCount;
}
if (SummaryIsTotalCountOnly)
{
result.summary = Enumerable.Repeat((object)totalCount, Options.TotalSummary.Length).ToArray();
}
else if (Options.HasSummary)
{
data = Buffer <R>(data);
result.summary = new AggregateCalculator <R>(data, accessor, Options.TotalSummary, Options.GroupSummary).Run();
}
}
result.data = data;
}
int ExecCount()
{
var expr = Builder.BuildCountExpr(Source.Expression);
#if DEBUG
Options.ExpressionWatcher?.Invoke(expr);
#endif
return(Source.Provider.Execute <int>(expr));
}
RemoteGroupingResult ExecRemoteGrouping()
{
return(RemoteGroupTransformer.Run(
ExecExpr <AnonType>(Source, Builder.BuildLoadGroupsExpr(Source.Expression)),
Options.HasGroups ? Options.Group.Length : 0,
Options.TotalSummary,
Options.GroupSummary
));
}
IEnumerable <R> ExecExpr <R>(IQueryable <S> source, Expression expr)
{
IEnumerable <R> result = source.Provider.CreateQuery <R>(expr);
#if DEBUG
if (Options.UseEnumerableOnce)
{
result = new EnumerableOnce <R>(result);
}
Options.ExpressionWatcher?.Invoke(expr);
#endif
return(result);
}
