protected Expression BuildFindEntityQuery(IEntityType entityType, IQueryProviderProvider queryProvider, JObject jObject, IDictionary <IProperty, object> keyPairs)
{
var query = queryProvider.GetQuery(entityType.ClrType);
var keyPredicateLambdaExpression = GetKeyFilterExpression(jObject, entityType, keyPairs);
var whereCallExpression = Expression.Call(null, WhereMethodInfo.MakeGenericMethod(entityType.ClrType), query.Expression, keyPredicateLambdaExpression);
return(whereCallExpression);
}
protected Expression BuildFindEntityQuery()
{
var query = MutationContext.QueryProviderProvider.GetQuery(EntityType.ClrType);
var keyPredicateLambdaExpression = GetKeyFilterExpression();
var whereCallExpression = Expression.Call(null, WhereMethodInfo.MakeGenericMethod(EntityType.ClrType), Root ? Expression.Constant(query) : query.Expression, keyPredicateLambdaExpression);
return(whereCallExpression);
}
public override Expression Apply(Expression expression, Random random)
{
var i = random.Next(_expressionFinder.FoundExpressions.Count);
var expressionToInject = _expressionFinder.FoundExpressions[i];
var typeArgument = expressionToInject.Type.GetGenericArguments()[0];
var prm = Expression.Parameter(typeArgument, "prm");
var candidateExpressions = new List <Expression>
{
Expression.Constant(random.Choose(new List <bool> {
true, false
})),
};
if (typeArgument == typeof(bool))
{
candidateExpressions.Add(prm);
}
var properties = typeArgument.GetProperties().Where(p => !p.GetMethod.IsStatic).ToList();
properties = FilterPropertyInfos(typeArgument, properties);
var boolProperties = properties.Where(p => p.PropertyType == typeof(bool)).ToList();
if (boolProperties.Any())
{
candidateExpressions.Add(Expression.Property(prm, random.Choose(boolProperties)));
}
// compare two properties
var propertiesOfTheSameType = properties.GroupBy(p => p.PropertyType).Where(g => g.Count() > 1).ToList();
if (propertiesOfTheSameType.Any())
{
var propertyGroup = random.Choose(propertiesOfTheSameType).ToList();
var firstProperty = random.Choose(propertyGroup);
var secondProperty = random.Choose(propertyGroup.Where(p => p != firstProperty).ToList());
candidateExpressions.Add(Expression.NotEqual(Expression.Property(prm, firstProperty), Expression.Property(prm, secondProperty)));
}
// compare property to constant
if (properties.Any())
{
var property = random.Choose(properties);
candidateExpressions.Add(
Expression.NotEqual(
Expression.Property(prm, property),
Expression.Default(property.PropertyType)));
}
if (IsEntityType(typeArgument))
{
var entityType = Context.Model.FindEntityType(typeArgument);
var navigations = entityType.GetNavigations().ToList();
var collectionNavigations = navigations.Where(n => n.IsCollection()).ToList();
var collectionNavigation = random.Choose(collectionNavigations);
if (collectionNavigation != null)
{
var any = EnumerableAnyMethodInfo.MakeGenericMethod(collectionNavigation.ForeignKey.DeclaringEntityType.ClrType);
// collection.Any()
candidateExpressions.Add(
Expression.Call(
any,
Expression.Property(prm, collectionNavigation.PropertyInfo)));
}
var navigation = random.Choose(navigations);
}
var lambdaBody = random.Choose(candidateExpressions);
var negated = random.Next(6) > 3;
if (negated)
{
lambdaBody = Expression.Not(lambdaBody);
}
var where = WhereMethodInfo.MakeGenericMethod(typeArgument);
var lambda = Expression.Lambda(lambdaBody, prm);
var injector = new ExpressionInjector(expressionToInject, e => Expression.Call(where, e, lambda));
return(injector.Visit(expression));
}
