/// <summary>
/// Filters this route's dataset by a parameter value
/// </summary>
/// <param name="property">An expression getting the property to filter for</param>
/// <param name="retriever">A function that will get the value of the parameter for a given request</param>
/// <typeparam name="T">The type of the parameter to filter with</typeparam>
/// <returns>This <see cref="RestModelOptionsBuilder{TModel, TUser}" /> object, for chaining</returns>
public RestModelOptionsBuilder <TModel, TUser> FilterByParameterEqual <T>(Expression <Func <TModel, T> > property, ParameterRetriever retriever)
{
PropertyInfo Info = RestModelOptionsBuilder <TModel, TUser> .ExtractProperty(property);
ParameterExpression ModelParameter = Expression.Parameter(typeof(TModel));
MemberExpression PropertyExpression = Expression.Property(ModelParameter, Info);
Type PropertyType = typeof(T);
this.Filter(
(c, d) => {
string?ParamValue = retriever.GetValue(c.Request);
if (ParamValue == null)
{
throw new ConditionFailedException("Failed to parse request parameter");
}
T Parsed = (T)ParameterResolver.ParseParameter(ParamValue, PropertyType);
// ModelParameter.Property == ParamValue
Expression ComparisonExpression = Expression.Equal(PropertyExpression, Expression.Constant(Parsed));
// and create the lambda
Expression <Func <TModel, bool> > FilterExpression =
Expression.Lambda <Func <TModel, bool> >(ComparisonExpression, ModelParameter);
return(d.Where(FilterExpression));
});
return(this);
}
/// <summary>
/// Sets a value on parsed models before the operation occurs.
/// </summary>
/// <param name="property">The property to set the value on</param>
/// <param name="retriever">A parameter retriever to use to get the value for a request</param>
/// <returns>This <see cref="RestModelOptionsBuilder{TModel, TUser}" /> object, for chaining</returns>
public RestModelOptionsBuilder <TModel, TUser> SetValue(PropertyInfo property, ParameterRetriever retriever)
{
Type PropertyType = property.PropertyType;
return(this.SetValue(
property,
c => ParameterResolver.ParseParameter(retriever.GetValue(c.Request), PropertyType)));
}