relationship

How do I use a remote method in one model to return info from another model?

由 瘦欲@ 提交于 2019-12-07 19:05:00
问题 So I've set up something really simple to learn how to use Loopback. The models are as follows: Person - based on built in User model food_pref typeId (number) personId (number) food_type type (string) Relationships: Person has many food_prefs (foreign key: personId) food_pref belongs to Person (foreign key: personId) food_pref belongs to food_type (foreign key: typeId) An auto-generated method gets created that returns the food_prefs based on the id of the Person. People/{id}/foodPrefs This

EF5 to EF6 upgrade - navigation properties are broken

由 ╄→гoц情女王★ 提交于 2019-12-07 08:15:24
问题 I used nuget to upgrade EF5 to EF6, and somewhere a breaking change was introduced for my solution. I discovered this when running one of my unit tests (it affects everything though). In each test, I init by doing this: // warm up EF. using (var context = new ReportingDbContext()) { context.Database.Initialize(false); // <-- boom! } // init the service _inventoryService = new InventoryService(); It tosses me this exception: The property 'EmployeeID' cannot be configured as a navigation

When to use an attribute (property) instead of an association/aggregation/composition when drawing a UML

由 坚强是说给别人听的谎言 提交于 2019-12-07 07:37:32
问题 Okay so I'm a bit confused as to when I should add an attribute to a class vs drawing an association to a class when trying to show a relationship in a UML diagram. For example let's say I have a DFA class that contains 10 state objects each having a different set of paths to various states in the DFA. Should I draw the composition line from the DFA to the State class or just type all 10 states in the attribute section of the DFA class. Basically I'm trying to figure out if when a Class A

Structuring Relationships in Firebase

由 三世轮回 提交于 2019-12-07 03:02:36
问题 I've got two items in my Firebase: providers and services , and I'm trying to figure out the best way to structure and build relationships using Firebase's recommended flattened architecture approach. My data looks something like this: { "services" : { "hip_replacement" : { "title" : "Hip Replacement" } }, "providers" : { "the_blue_hospital" : { "title" : "The Blue Hospital" } } } I would like to link these two items together so that if you were to visit the Hip Replacement page, The Blue

Laravel 4 Relationship: messaging system

由 核能气质少年 提交于 2019-12-07 02:38:31
I followed the suggestions from user ehp in order to build a lightweight messaging-system: https://stackoverflow.com/a/18717864/1084315 Users: id | username Messages: id | from | content user_messages: user_id | message_id class User extends Eloquent { public function messages() { return $this->belongsToMany('Message'); } public function sent_messages() { return $this->hasMany('Messages', 'from'); } } class Message extends Eloquent { public function from() { return $this->belongsTo('User', 'from'); } public function to() { return $this->belongsToMany('User'); } } I create a message like this:

sugarCRM : creating relationship using module loader, package not installing

由 我的梦境 提交于 2019-12-06 16:06:43
I am trying to create relationships through module loader in SugarCRM. But the problem is my package is stopped installing after 55%. When I am viewing display log the error is:- Failed to copy cache/upgrades/temp/SYWr9G/custom/metadata/accounts_contacts_1MetaData.php custom/metadata/accounts_contacts_1MetaData.php I tried to change permissions also but at some point they through internal server error 500. Following are the code which I am using. 1.In manifest.php file : $installdefs = array( 'id' => 'package_20170804', 'copy' => array( 0 => array( 'from' => '<basepath>/accounts_contacts

Ember.js: How to represent a has-many model relationship?

由 房东的猫 提交于 2019-12-06 12:48:10
I am trying to set up an ember app where I have many Items, all of which have many Options. I then need a 'dashboard' area where I can monitor information on all Items/Options. In a previous post I got a working example of a dashboard which monitors a single collection of Items. How do I update this to represent child Options for each Item? Javascript - from jsBin (updated) App = Ember.Application.create(); /* ROUTES */ App.Router.map(function() { this.resource('items'); this.resource('dashboard'); }); App.IndexRoute = Ember.Route.extend({ redirect: function() { this.transitionTo('items'); } }

Neo4j Match Node Property OR Relationship Property

由 北慕城南 提交于 2019-12-06 12:40:01
问题 I'm trying to write a query that will return nodes that either match a node property or a relationship property. For instance, I want all nodes where the name property is George OR if the relationship property status is "good". I have two queries that will get the nodes for each of these: MATCH (n) where n.name = 'George' return n MATCH (n)-[r]-() where r.status = 'good' return n Is there a singe query I could write to get these combined results? I thought I could use this optional query

How to plot relationships in R?

由 陌路散爱 提交于 2019-12-06 10:02:06
The relationship is expressed as a matrix x like this: John Jack Mary Wendy John 0 2 1 1 Jack 2 0 1 0 Mary 1 1 0 1 Wendy 1 0 1 0 The entries refer to the number of connections they have. Could anyone show me how to plot it as a network in R? Thanks! This is known as an adjacency matrix. There is some information in the R FAQ on plotting social networks expressed as matrices: Plotting social network data can be easily done with the igraph package in R. [...] In order for the igraph package to recognize this table as a network, we can first convert it to a matrix. Then, if we wish to calculate

Relationships in a UML class diagram

由 。_饼干妹妹 提交于 2019-12-06 08:33:53
问题 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
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