/// <summary>
/// We are using just some properties of the entity. Rewrite the properties as JObject field lookups and
/// record all the field names used to ensure we only select those.
/// </summary>
/// <param name="selectExpression">Select expression to re-bind.</param>
void RebindPropertiesAndElasticFields(Expression selectExpression)
{
var projection = MemberProjectionExpressionVisitor.Rebind(SourceType, Mapping, selectExpression);
var compiled = Expression.Lambda(projection.Expression, projection.Parameter).Compile();
itemProjector = h => compiled.DynamicInvoke(h);
searchRequest.Fields.AddRange(projection.Collected);
}
internal static new RebindCollectionResult<string> Rebind(Type sourceType, IElasticMapping mapping, Expression selector)
{
var parameter = Expression.Parameter(typeof(Hit), "h");
var visitor = new MemberProjectionExpressionVisitor(sourceType, parameter, mapping);
Argument.EnsureNotNull("selector", selector);
var materializer = visitor.Visit(selector);
return new RebindCollectionResult<string>(materializer, visitor.fieldNames, parameter);
}
internal static new RebindCollectionResult <string> Rebind(string prefix, IElasticMapping mapping, Expression selector)
{
var parameter = Expression.Parameter(typeof(Hit), "h");
var visitor = new MemberProjectionExpressionVisitor(prefix, parameter, mapping);
Argument.EnsureNotNull("selector", selector);
var materializer = visitor.Visit(selector);
return(new RebindCollectionResult <string>(materializer, visitor.fieldNames, parameter));
}
