bidirectional

I did some research, and after reading this and this (and all the related questions) I still can't figure which is the proper way to update a many to many relationship in Symonfy 2 Doctrine. It feels that there should be a very simple way of doing it that I still haven't found. I have this 2 entities: class student_main { /** * @ORM\ManyToMany(targetEntity="support_log", inversedBy="student_main") * @ORM\JoinTable(name="support_log_student") **/ private $support_log; and class support_log { /** * @ORM\ManyToMany(targetEntity="student_main", mappedBy="support_log") **/ private $student; I want

According to most of the reading I have done, a bidirectional search algorithm is said to terminate when the "forward" and "backward" frontiers first intersect. However, in Section 3.4.6 of Artificial Intelligence: A Modern Approach , Russel and Norvig state: Bidirectional search is implemented by replacing the goal test with a check to see whether the frontiers of the two searches intersect; if they do, a solution has been found. It is important to realize that the first solution found may not be optimal, even if the two searches are both breadth-first; some additional search is required to

I have the case where I want to map an entity to a viewmodel and back. I have to specify the mapping explicitly with ForMember() because their properties do not share the exact same names. Here is a short example of how my classes look like: public class PartTwo { public int Integer { get; set; } } public class PartTwoViewModel { public int PartInteger { get; set; } } And I want to use them this way: Mapper.CreateMap<PartTwo, PartTwoViewModel>() .ForMember(dst => dst.PartInteger, opt => opt.MapFrom(src => src.Integer)) .ReverseMap(); var partTwoViewModel = new PartTwoViewModel() { PartInteger

I have data that is organized in kind of a "key-key" format, rather than "key-value". It's like a HashMap, but I will need O(1) lookup in both directions. Is there a name for this type of data structure, and is anything like this included in Java's standard libraries? (or maybe Apache Commons?) I could write my own class that basically uses two mirrored Maps, but I'd rather not reinvent the wheel (if this already exists but I'm just not searching for the right term). uckelman There is no such class in the Java API. The Apache Commons class you want is going to be one of the implementations of

This question already has an answer here: Two way/reverse map 13 answers Python dict is a very useful data-structure: d = {'a': 1, 'b': 2} d['a'] # get 1 Sometimes you'd also like to index by values. d[1] # get 'a' Which is the most efficient way to implement this data-structure? Any official recommend way to do it? Here is a class for a bidirectional dict , inspired by Finding key from value in Python dictionary and modified to allow the following 2) and 3). Note that : 1) The inverse directory bd.inverse auto-updates itself when the standard dict bd is modified. 2) The inverse directory bd