relationships

问题 I am here again with a trouble understanding the correct way of doing Laravel Relationships I have this User Model public function concessionaire() { return $this->hasOne('App\Concessionaire', 'meternum', 'meternum'); } and Concessionaire Model public function user() { return $this->belongsTO('App\User', 'meternum', 'meternum'); } But when I try to display it in my view. the concessionaire data fields does not display.. In my Controller I have this $dataUser = User::where('usertype', '=',

问题 I am trying to make a simple follower/following system in laravel, nothing special, just click a button to follow or unfollow, and display the followers or the people following you. My trouble is I can't figure out how to make the relationships between the models. These are the migrations: -User migration: Schema::create('users', function (Blueprint $table) { $table->increments('id'); $table->timestamps(); $table->string('email'); $table->string('first_name'); $table->string('last_name');

问题 I've been looking over relationships in Laravel 4 in the documentation and I'm trying to work out the following. I have a table in my database called 'events'. This table has various fields that mainly contain ID's that relate to other tables. For example, I have a 'courses' table. The events table contains a field called 'course_id' which relates to the ID of the 'id' field in the courses table. So basically, I'm after some advice on how you go about relating the two (belongsTo()?) and then

问题 I was wondering if there are any advantages or disadvantages in storing data into relationships or nodes. For example, if I were to store comments related to a discussion into the DB, should I store the comment data in a "comment" relationship or a "comment" node that is related to the discussion through a separate relationship. 回答1: The correct data model depends on the types of queries you need to make. You should figure out what your queries are, and then determine a data model that meets

问题 I was wondering if there are any advantages or disadvantages in storing data into relationships or nodes. For example, if I were to store comments related to a discussion into the DB, should I store the comment data in a "comment" relationship or a "comment" node that is related to the discussion through a separate relationship. 回答1: The correct data model depends on the types of queries you need to make. You should figure out what your queries are, and then determine a data model that meets

问题 I was wondering if there are any advantages or disadvantages in storing data into relationships or nodes. For example, if I were to store comments related to a discussion into the DB, should I store the comment data in a "comment" relationship or a "comment" node that is related to the discussion through a separate relationship. 回答1: The correct data model depends on the types of queries you need to make. You should figure out what your queries are, and then determine a data model that meets

问题 I have a MySQL table named companies like this: +---------+-----------+-----------+ | id_comp | comp_name | id_parent | +---------+-----------+-----------+ | 1 | comp1 | NULL | | 2 | comp2 | 1 | | 3 | comp3 | 2 | | 4 | comp4 | 2 | | 5 | comp5 | 2 | | 6 | comp6 | 1 | | 3 | comp3 | 6 | | 5 | comp5 | 6 | | 7 | comp7 | 6 | | 4 | comp4 | 6 | | 8 | comp8 | 4 | +---------+-----------+-----------+ Each company may have multiple parents (ex: comp3 , which is child of comp2 and comp6 ), each parent may

问题 I have a simple Coredata model with one entity called "conversation" and the other one "messages". Basically, I need to kind of reproduce the iPhone sms application. I have a to-one relationship from message to conversation and a to-many from conversation to messages. Conversation{ messages<-->>Message.conversation } Message{ conversation<<-->Conversation.messages } Anytime I launch my app, all my conversation are loaded in my fetchedResultsController. If I understood correctly how Coredata

问题 Hi I have a posts model where a post belongs_to a user and a user has_many posts. The posts table has a user_id At the moment in my show posts I have: <td><%= post.user_id %></td> I get the users id who makes the post this works fine. How can I get the username when the Users table contains a column User_name do I need to add post_id to Users or? class User < ActiveRecord::Base devise :database_authenticatable, :registerable, :recoverable, :rememberable, :trackable, :validatable attr

问题 Basically I have following models in CakePHP: User(id, username) Photo(id, user_id, path) I have set up following relation: User hasMany Photo. On one screen, I would like to list users, and show random photo next to each user. I tried setting up following relation: User hasOne SamplePhoto (where SamplePhoto is just Photo model) but when user has two photos for instance, he is listed twice on the list. basically my question is: can you reduce hasMany relation to hasOne, without adding any