public async Task TestAsRequested()
{
#pragma warning disable CS1998 // Async method lacks 'await' operators and will run synchronously
await Assert.ThrowsExceptionAsync <ArgumentNullException>(async() =>
{
IDataModelCollection <Model.SharePoint.IList> bla = null;
var a = bla.AsRequested();
});
#pragma warning restore CS1998 // Async method lacks 'await' operators and will run synchronously
}
/// <summary>
/// Returns an <see cref="IEnumerable{T}" /> which can be enumerated without executing an actual LINQ query on the target data provider.
/// </summary>
/// <typeparam name="TSource"> The type of the elements of <paramref name="source" />. </typeparam>
/// <param name="source"> An <see cref="IDataModelCollection{T}" /> to enumerate. </param>
/// <returns> The query results. </returns>
/// <exception cref="InvalidOperationException"> <paramref name="source" /> is <see langword="null" />. </exception>
/// <exception cref="ArgumentNullException"> <paramref name="source" /> is not a <see cref="IAsyncEnumerable{T}" />. </exception>
public static IEnumerable <TSource> AsRequested <TSource>(
this IDataModelCollection <TSource> source)
{
if (source == null)
{
throw new ArgumentNullException(nameof(source));
}
if (source is BaseQueryableDataModelCollection <TSource> enumerable)
{
return((IEnumerable <TSource>)enumerable.RequestedItems);
}
throw new InvalidOperationException(PnPCoreResources.Exception_InvalidOperation_NotAsyncQueryableSource);
}
/// <summary>
/// When implemented, loads the full object graph for the first
/// <see cref="DataModel"/> that is returned from the specified
/// <paramref name="query"/>, within the specified database
/// <paramref name="transactionContext"/>.
/// </summary>
/// <param name="query"></param>
/// <param name="transactionContext"></param>
/// <param name="depth"></param>
/// <param name="loadedModels">
/// Used for keeping recursive loading from resulting
/// in infinite loops. Evaluate each loaded item from
/// a database result set against this collection; if
/// there is a match, use the collection item,
/// otherwise use the database loaded item, deep-load
/// it, and add it to this collection.
/// </param>
/// <returns></returns>
public virtual TModel DeepLoadModel <TModel>(
DataModelQuery <TModel> query, int?depth, DbTransaction transactionContext,
List <DataModel> loadedModels
) where TModel : DataModel
{
TModel e = LoadModel(query, transactionContext);
if (e == null)
{
return(e);
}
if (loadedModels == null)
{
loadedModels = new List <DataModel>();
}
if (loadedModels.Contains(e))
{
return((TModel)loadedModels[loadedModels.IndexOf(e)]);
}
foreach (DataModel previouslyLoadedModel in loadedModels)
{
if (query.GetType().IsGenericType)
{
Type qt = query.GetType().GetGenericArguments()[0];
if (previouslyLoadedModel.GetType().IsOrInherits(qt) &&
previouslyLoadedModel.Equals(e) &&
previouslyLoadedModel is TModel)
{
return((TModel)previouslyLoadedModel);
}
}
}
if (!loadedModels.Contains(e))
{
loadedModels.Add(e);
}
foreach (var fe_kvp in e.EntityMappings.ForeignModelMappings)
{
if (depth == null || depth > 0)
{
ForeignDataModelAttribute fe = fe_kvp.Value;
Type targetEntityType = fe.TargetMemberType;
while (targetEntityType.IsGenericType &&
targetEntityType.IsOrInherits(typeof(IEnumerable)))
{
targetEntityType = targetEntityType.GetGenericArguments().Last();
}
if (!targetEntityType.IsDataModel())
{
targetEntityType = typeof(DataModel <>).MakeGenericType(targetEntityType);
}
Type subQueryType = typeof(DataModelQuery <>).MakeGenericType(targetEntityType);
Relationship relationship = fe.Relationship;
if (relationship == Relationship.ManyToMany &&
string.IsNullOrEmpty(fe.MappingTable))
{
relationship = Relationship.OneToMany;
}
switch (relationship)
{
case Relationship.OneToOne:
case Relationship.ManyToOne:
IDataModelQuery subQuery = ((IDataModelQuery)Activator.CreateInstance(subQueryType))
.WhereColumn[fe.RelatedTableColumn].IsEqualTo(
e.ColumnMappedValue[fe.LocalColumn]);
DataModel e2 = DeepLoadModel(targetEntityType, subQuery,
depth == null ? null : depth - 1,
transactionContext, loadedModels);
object e2o = e2;
if (!fe.TargetMemberType.IsDataModel())
{
e2o = (e2).Entity;
}
if (fe.TargetMember.MemberType == MemberTypes.Field)
{
((FieldInfo)fe.TargetMember).SetValue(e.Entity, e2o);
}
else if (fe.TargetMember.MemberType == MemberTypes.Property)
{
((PropertyInfo)fe.TargetMember).SetValue(e.Entity, e2o, new object[] {});
}
break;
case Relationship.OneToMany:
IDataModelQuery subQuery2 = ((IDataModelQuery)Activator.CreateInstance(subQueryType))
.WhereColumn[fe.RelatedTableColumn].IsEqualTo(
e.ColumnMappedValue[fe.LocalColumn]);
IDataModelCollection e2c = DeepLoadModels(targetEntityType, subQuery2, depth,
transactionContext, loadedModels);
object e2ct = Activator.CreateInstance(fe.TargetMemberType);
if (e2ct is IList)
{
bool de = fe.TargetMemberType.IsGenericType &&
fe.TargetMemberType.GetGenericArguments().Last().IsDataModel();
foreach (object e2cx in e2c)
{
if (de)
{
((IList)e2ct).Add(e2cx);
}
else
{
object e2cx2 = ((DataModel)e2cx).Entity;
((IList)e2ct).Add(e2cx2);
}
}
}
else
{
e2ct = ((IList)e2c)[0];
}
if (fe.TargetMember.MemberType == MemberTypes.Field)
{
((FieldInfo)fe.TargetMember).SetValue(e.Entity, e2ct);
}
else if (fe.TargetMember.MemberType == MemberTypes.Property)
{
((PropertyInfo)fe.TargetMember).SetValue(e.Entity, e2ct, new object[] {});
}
break;
case Relationship.ManyToMany:
if (!fe.TargetMemberType.IsOrInherits(typeof(IList)))
{
throw new InvalidCastException(
"Cannot apply ManyToMany binding to a non-IList property.");
}
Type tleft = fe.DeclaringType;
Type tleftEntity = tleft;
while (tleftEntity.IsDataModelWrapper(true))
{
if (tleftEntity.BaseType != (typeof(DataModel <>)).BaseType)
{
tleftEntity = tleftEntity.BaseType;
}
else
{
tleftEntity = tleftEntity.GetGenericArguments()[0];
}
}
Type tright = (fe.TargetMemberType.IsGenericType &&
!fe.TargetMemberType.IsDataModel() &&
fe.TargetMemberType.IsOrInherits(typeof(IList)))
? fe.TargetMemberType.GetGenericArguments()[0]
:
fe.TargetMemberType;
Type trightEntity = tright;
if (!tright.IsDataModel())
{
tright = typeof(DataModel <>).MakeGenericType(tright);
}
Type mapType = typeof(DataModelMap.RuntimeMappingTable <,>)
.MakeGenericType(
// left side of mapping table
fe.TargetMember.DeclaringType,
// right side
tright);
var mapObj = (DataModel)Activator.CreateInstance(mapType);
mapObj.EntityMappings.TableMapping.Schema = fe.MappingTableSchema ??
ProviderDefaults.DefaultSchema;
mapObj.EntityMappings.TableMapping.Table = fe.MappingTable ??
(string.Compare(trightEntity.Name,
tleftEntity.Name) == -1
? trightEntity.Name +
tleftEntity.Name
: tleftEntity.Name +
trightEntity.Name);
DataModelColumnAttribute mapLeftCol = mapObj.EntityMappings.FieldMappings["LeftColumn"];
mapLeftCol.ColumnName = fe.LocalColumn;
mapLeftCol.DbType = e.EntityMappings
.GetFieldMappingByDbColumnName(fe.LocalColumn).DbType;
mapLeftCol.TargetMemberType = e.EntityMappings
.GetFieldMappingByDbColumnName(fe.LocalColumn).TargetMemberType;
Type mapQueryType = typeof(DataModelQuery <>).MakeGenericType(new[] { mapType });
var mapQuery = (IDataModelQuery)Activator.CreateInstance(mapQueryType);
mapQuery.WhereColumn[fe.LocalColumn].IsEqualTo(
e.ColumnMappedValue[fe.LocalColumn]);
IDataModelCollection mapdes = LoadModels(mapType, mapQuery, transactionContext);
var mappedDEs = new DataModelCollection <DataModel>();
foreach (DataModel de in mapdes) // de is a MappingTable<L,R>
{
var mappedDEQuery = (IDataModelQuery)
Activator.CreateInstance(typeof(DataModelQuery <>)
.MakeGenericType(targetEntityType));
mappedDEQuery.WhereColumn[fe.RelatedTableColumn]
.IsEqualTo(de.ColumnMappedValue[fe.RelatedTableColumn]);
DataModel mappedDE = DeepLoadModel(targetEntityType, mappedDEQuery,
depth == null ? null : depth - 1,
transactionContext, loadedModels);
if (mappedDE != null)
{
mappedDEs.Add(mappedDE);
}
}
Type mmtargtype = fe.TargetMemberType;
var mmtargcol = (IList)Activator.CreateInstance(fe.TargetMemberType);
Type mapdeType = null;
foreach (DataModel mapde in mappedDEs)
{
if (mapdeType == null)
{
mapdeType = mapde.GetType();
}
object deinst = mapde;
if (mmtargtype.IsGenericType &&
!mmtargtype.GetGenericArguments()[0].IsDataModel())
{
deinst = mapde.Entity;
}
mmtargcol.Add(deinst);
}
if (fe.TargetMember is FieldInfo)
{
((FieldInfo)fe.TargetMember).SetValue(e, mmtargcol);
}
else if (fe.TargetMember is PropertyInfo)
{
((PropertyInfo)fe.TargetMember).SetValue(
e.Entity, mmtargcol, new object[] {});
}
break;
}
}
}
foreach (var field_kvp in e.EntityMappings.FieldMappings)
{
DataModelColumnAttribute field = field_kvp.Value;
if (field.IsForeignKey &&
field.ForeignKeyMapping.AssignToMember != null)
{
LoadMember(e, field, field_kvp.Key, transactionContext, loadedModels);
}
}
return(e);
}
