/// <summary> /// Find the first document using Linq expression. Returns null if not found. Must have indexes on predicate. /// </summary> public T FindOne(Expression <Func <T, bool> > predicate) { return(this.Find(QueryVisitor.Visit(predicate)).FirstOrDefault()); }
/// <summary> /// Returns true if query returns any document. This method does not deserialize any document. Needs indexes on query expression /// </summary> public bool Exists(Expression <Func <T, bool> > predicate) { return(this.Exists(QueryVisitor.Visit(predicate))); }
/// <summary> /// Find documents inside a collection using Linq expression. Must have indexes in linq expression /// </summary> public IEnumerable <T> Find(Expression <Func <T, bool> > predicate) { return(this.Find(QueryVisitor.Visit(predicate))); }
/// <summary> /// Count documnets with a query. This method does not deserialize any document. Needs indexes on query expression /// </summary> public int Count(Expression <Func <T, bool> > predicate) { return(this.Count(QueryVisitor.Visit(predicate))); }
/// <summary> /// Delete document based on a LINQ query. /// </summary> public virtual int Delete(Expression <Func <T, bool> > predicate) { return(this.Delete(QueryVisitor.Visit(predicate))); }