public override Expression Apply(Expression expression, Random random)
{
var i = random.Next(_expressionFinder.FoundExpressions.Count);
var expr = _expressionFinder.FoundExpressions[i];
var entityType = expr.Type.GetGenericArguments()[0];
var navigations = Context.Model.FindEntityType(entityType)?.GetNavigations().ToList();
var prm = Expression.Parameter(entityType, "prm");
if (navigations != null && navigations.Any())
{
var j = random.Next(navigations.Count);
var navigation = navigations[j];
var includeMethod = IncludeMethodInfo.MakeGenericMethod(entityType, navigation.ClrType);
var injector = new ExpressionInjector(
_expressionFinder.FoundExpressions[i],
e => Expression.Call(
includeMethod,
e,
Expression.Lambda(Expression.Property(prm, navigation.Name), prm)));
return(injector.Visit(expression));
}
return(expression);
}
public override Expression Apply(Expression expression, Random random)
{
var i = random.Next(_expressionFinder.FoundExpressions.Count);
var expr = _expressionFinder.FoundExpressions[i];
var thenInclude = random.Next(3) > 0;
var entityType = expr.Type.GetGenericArguments()[0];
var propertyType = expr.Type.GetGenericArguments()[1];
var propertyElementType = IsEnumerableType(propertyType) || propertyType.GetInterfaces().Any(ii => IsEnumerableType(ii))
? propertyType.GetGenericArguments()[0]
: propertyType;
var navigations = thenInclude
? Context.Model.FindEntityType(propertyElementType)?.GetNavigations().ToList()
: Context.Model.FindEntityType(entityType)?.GetNavigations().ToList();
var prm = thenInclude
? Expression.Parameter(propertyElementType, "prm")
: Expression.Parameter(entityType, "prm");
if (navigations != null &&
navigations.Any())
{
var j = random.Next(navigations.Count);
var navigation = navigations[j];
if (thenInclude)
{
var thenIncludeMethod = IsEnumerableType(propertyType) || propertyType.GetInterfaces().Any(ii => IsEnumerableType(ii))
? ThenIncludeCollectionMethodInfo.MakeGenericMethod(entityType, propertyElementType, navigation.ClrType)
: ThenIncludeReferenceMethodInfo.MakeGenericMethod(entityType, propertyElementType, navigation.ClrType);
var injector = new ExpressionInjector(
_expressionFinder.FoundExpressions[i],
e => Expression.Call(
thenIncludeMethod,
e,
Expression.Lambda(Expression.Property(prm, navigation.Name), prm)));
return(injector.Visit(expression));
}
else
{
var includeMethod = IncludeMethodInfo.MakeGenericMethod(entityType, navigation.ClrType);
var injector = new ExpressionInjector(
_expressionFinder.FoundExpressions[i],
e => Expression.Call(
includeMethod,
e,
Expression.Lambda(Expression.Property(prm, navigation.Name), prm)));
return(injector.Visit(expression));
}
}
return(expression);
}
// to get this to work, code was referenced and borrowed from https://github.com/aspnet/EntityFramework/blob/dev/src/EntityFramework.Core/EntityFrameworkQueryableExtensions.cs
public static IQueryable <T> IncludeString <T>(this IQueryable <T> query, string include) where T : class, new()
{
// need to get the first include, and then append the thenincludes
Type childType, parentType = typeof(T);
MethodInfo includeMethodInfo;
MethodInfo thenIncludeMethodInfo;
MethodCallExpression methodCallExpression;
IIncludableQueryable <T, object> resultQuery;
string[] includeProperties = include.Split('.');
childType = parentType.GetProperty(includeProperties[0], BindingFlags.IgnoreCase | BindingFlags.Public | BindingFlags.Instance).PropertyType;
includeMethodInfo = IncludeMethodInfo.MakeGenericMethod(parentType, childType);
methodCallExpression = Expression.Call(
includeMethodInfo,
query.Expression,
CreateExpression(parentType, includeProperties[0]));
resultQuery = new IncludableQueryable <T, object>(query.Provider.CreateQuery <T>(methodCallExpression));
for (int i = 1; i < includeProperties.Length; i++)
{
parentType = childType;
if (parentType.IsGenericType)
{
parentType = parentType.GetGenericArguments().First();
childType = parentType.GetProperty(includeProperties[i], BindingFlags.IgnoreCase | BindingFlags.Public | BindingFlags.Instance).PropertyType;
thenIncludeMethodInfo = ThenIncludeAfterCollectionMethodInfo.MakeGenericMethod(typeof(T), parentType, childType);
methodCallExpression = Expression.Call(
thenIncludeMethodInfo,
resultQuery.Expression,
CreateExpression(parentType, includeProperties[i]));
}
resultQuery = new IncludableQueryable <T, object>(resultQuery.Provider.CreateQuery <T>(methodCallExpression));
}
return(resultQuery);
}
/// <summary>
/// This API supports the Entity Framework Core infrastructure and is not intended to be used
/// directly from your code. This API may change or be removed in future releases.
/// </summary>
public virtual void CompileIncludes(
[NotNull] QueryModel queryModel,
[NotNull] ICollection <IncludeResultOperator> includeResultOperators,
bool trackingQuery)
{
var includeGroupings
= CreateIncludeSpecifications(queryModel, includeResultOperators)
.GroupBy(a => a.QuerySourceReferenceExpression);
foreach (var includeGrouping in includeGroupings)
{
var entityParameter = Expression.Parameter(includeGrouping.Key.Type, name: "entity");
var propertyExpressions = new List <Expression>();
var blockExpressions = new List <Expression>();
if (trackingQuery)
{
blockExpressions.Add(
Expression.Call(
_queryBufferParameter,
_startTrackingMethodInfo,
entityParameter,
Expression.Constant(
_queryCompilationContext.Model
.FindEntityType(entityParameter.Type))));
}
var includedIndex = 0;
foreach (var includeSpecification in includeGrouping)
{
_queryCompilationContext.Logger
.LogDebug(
CoreEventId.IncludingNavigation,
() => CoreStrings.LogIncludingNavigation(includeSpecification.IncludeResultOperator));
propertyExpressions.AddRange(
includeSpecification.NavigationPath
.Select((t, i) =>
includeSpecification.NavigationPath
.Take(i + 1)
.Aggregate(
(Expression)includeSpecification.QuerySourceReferenceExpression,
EntityQueryModelVisitor.CreatePropertyExpression)));
blockExpressions.Add(
BuildIncludeExpressions(
includeSpecification.NavigationPath,
entityParameter,
trackingQuery,
ref includedIndex,
navigationIndex: 0));
// TODO: Hack until new Include fully implemented
includeResultOperators.Remove(includeSpecification.IncludeResultOperator);
}
var includeReplacingExpressionVisitor
= new IncludeReplacingExpressionVisitor(
includeGrouping.Key,
Expression.Call(
IncludeMethodInfo.MakeGenericMethod(includeGrouping.Key.Type),
includeGrouping.Key,
Expression.NewArrayInit(
typeof(object),
propertyExpressions),
trackingQuery
? (Expression)
Expression.Property(
Expression.Property(
EntityQueryModelVisitor.QueryContextParameter,
propertyName: "StateManager"),
propertyName: "Value")
: Expression.Default(typeof(IStateManager)),
trackingQuery
? (Expression)
Expression.Property(
EntityQueryModelVisitor.QueryContextParameter,
propertyName: "QueryBuffer")
: Expression.Default(typeof(IQueryBuffer)),
Expression.Lambda(
Expression.Block(typeof(void), blockExpressions),
entityParameter,
_includedParameter,
_stateManagerParameter,
_queryBufferParameter)));
queryModel.SelectClause.TransformExpressions(includeReplacingExpressionVisitor.Visit);
}
}
