public OrQuery PredicateToQuery(Expression <Func <T, bool> > where)
{
// create a fake queryable to force query parsing and capture resolution
var executor = new NullExecutor(_typeDescription.AsTypeDescription);
var queryable = new NullQueryable <T>(executor);
var unused = queryable.Where(where).ToList();
return(executor.Expression);
}
private OrQuery PredicateToQuery <T>(Expression <Func <T, bool> > predicate, string collectionName)
{
// convert the predicate to a serializable query
// create a fake queryable to force query parsing and capture resolution
var schema = _connector.GetCollectionSchema(collectionName);
var executor = new NullExecutor(schema, collectionName);
var queryable = new NullQueryable <T>(executor);
var unused = queryable.Where(predicate).ToList();
var query = executor.Expression;
return(query);
}
/// <summary>
/// Precompile an expression tree as a query. It can be used to avoid parsing the expression tree multiple times
/// </summary>
/// <param name="where"></param>
/// <param name="collectionName"></param>
/// <returns></returns>
public OrQuery PredicateToQuery(Expression <Func <T, bool> > where, string collectionName = null)
{
collectionName ??= _collectionSchema.CollectionName;
// create a fake queryable to force query parsing and capture resolution
var executor = new NullExecutor(_collectionSchema, collectionName);
var queryable = new NullQueryable <T>(executor);
var unused = queryable.Where(where).ToList();
var query = executor.Expression;
query.CollectionName = _collectionName;
return(query);
}
