relationship

I am kind of new to programming and parse, but I am really interested in it. I already know how to create a PFUser and how to set relations between Users, thanks to the tutorial provided on parse.com. The thing is they only have examples for one User following another User. I would prefer sending like a "Friends Request", for example like in instagram if a profile is not open to anybody. How can I code that? What do I need to think of? Example Code is very welcome :P I would definitely create a FriendRequest table as @MatthewLuiHK suggested. However, I don't know if this is the best way to

Following java doc @Where Where clause to add to the element Entity or target entity of a collection. The clause is written in SQL. A common use case here is for soft-deletes. @WhereJoinTable Where clause to add to the collection join table. The clause is written in SQL. Just as with {@link Where}, a common use case is for implementing soft-deletes. It seems annotations can be used in same way in general: |---------------------|-------------------|-------------------| | |@Where | @WhereTable | |---------------------|-------------------|-------------------| |target elements |TYPE, METHOD, FIELD

I have an application that models a tree, with classes Tree, Node and Edge (I need the Edge class!), and I'm not sure how to represent the relationships in the class diagram for this. I've read other posts about this, but am still in doubt. The Tree object have a pointer to a Node (its root), which I believe defines an one-way association (Tree -> Node) with multiplicity 1..1 in both ends. Is it right? Each Node object have pointers to the edges that comes out of it (Edge objects). Since these edges only exist if the node exist, I believe it's a composition association. But then I have, in

I'm trying to implement a morphable table for categories, right now I've the following. // Snippet Table - id - title - body // Post Table - id - title - body // Category Table - id - name I want to be able to morph the posts and snippets to have only one category, something like this: // Categorizable Table - category_id - categorizable_id - categorizable_type Do I have to have another model for this categorizable table? Or there is a way to set it without another model? So far I have this class Snippet extends Model { public function category() { return $this->morphOne(Category::class,

I'm trying to create a rails app where user can create events and invite participants to it and need your help! I've been going in circle, trying few things but doesn't seem right at all and this is now driving me crazy!! I'm using rails 4. How would you setup the active model? User has_many :events through :meeting //for the participants? has_many :events // for the organizer? Event belongs to :user has_many :participants, class_name: "User" Participant belongs to :user has_many :events through :meeting Meeting has_many :participants has_many :events Does that make any sense? Do I need the

I'm using Laravel 4. I have many to many relationships in my system. And I choose to use Wordpress taxonomy table scheme. But how can I make models relationships with Laravel 4 Eloquent ORM? Here is my database tables; Table terms : +------------+---------------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +------------+---------------------+------+-----+---------+----------------+ | term_id | bigint(20) unsigned | NO | PRI | NULL | auto_increment | | name | varchar(200) | NO | MUL | | | | slug | varchar(200) | NO | UNI | | | +------------+----

I've been studying Core Data quite a bit now, and I've now decided it's time to use it in a new project I'm doing. Having never use it in a working project I've just come across a few issues I would like to get the communities feedback on. I'm doing a location based application and I would like to store "outings" in my Core Data model, so for each trip I have some traditional information such as date, distance, description etc... But I also need to save location information which I'll need to plot some points on a map. So I have a "to" and "from" object per trip, I've created a MapPoint entity

I've got a parent-child OO relationship . Parent obejcts has many child objects and every child object knows about it's parent by reference. The parent can be a child too ( basically its a tree ). When i do a var_dump() on the root object it says ["parent"]=> RECURSION many times and the generated description will be really long. I'm wondering if i do something wrong. If yes, i'm interested in the "best practice". Thanks for the help! You're not doing anything wrong; you have a parent that has a reference to its children, and each child has a reference back to its parent. When you var_dump()