associations

Doctrine 2 Pagination with Association Mapping

由 坚强是说给别人听的谎言 提交于 2020-01-13 13:50:32
问题 I am wondering how can you paginate the results obtained from an entity association mapping in Doctrine 2? For example class Customer { /** * @OneToMany(targetEntity="Order") */ private $orders; } can be used as such: $customer->getOrders(); which will return a collection of Order objects. The problem is when there are a large number of order objects. We can use Doctrine\ORM\Tools\Pagination\Paginator when building custom queries, however I do not see any way to hook into query generation

Association between Category, Subcategory, and Lawyer

由 末鹿安然 提交于 2020-01-13 04:55:47
问题 I have a vast list of Lawyers, Categories, and Subcategories. Hint (so you could have a clue if my associations are okay) On Categories Table, I do not want to see a column on Categories Table referencing Subcategories. On Subcategories Table, I do not want to see a column on Subcategories Table referencing Categories. Not all Categories has Subcategories. i.e. some don't have subcategories as seen in the picture. I have 2 separate forms creating category and subcategory. I added category_id

Association between Category, Subcategory, and Lawyer

由 泄露秘密 提交于 2020-01-13 04:55:06
问题 I have a vast list of Lawyers, Categories, and Subcategories. Hint (so you could have a clue if my associations are okay) On Categories Table, I do not want to see a column on Categories Table referencing Subcategories. On Subcategories Table, I do not want to see a column on Subcategories Table referencing Categories. Not all Categories has Subcategories. i.e. some don't have subcategories as seen in the picture. I have 2 separate forms creating category and subcategory. I added category_id

Validate presence of polymorphic parent

由 一个人想着一个人 提交于 2020-01-12 13:55:14
问题 I am developing a Rails 3.2 application with the following models: class User < ActiveRecord::Base # Associations belongs_to :authenticatable, polymorphic: true # Validations validates :authenticatable, presence: true # this is the critical line end class Physician < ActiveRecord::Base attr_accessible :user_attributes # Associations has_one :user, as: :authenticatable accepts_nested_attributes_for :user end What I am trying to do is validate whether a user always has an authenticatable parent

How do I create an association between these 2 entities without touching the DB?

由 China☆狼群 提交于 2020-01-11 09:21:35
问题 I need to create a "virtual" association between these two entities (1-*) so that I can traverse them using linq , but the problem is I cannot touch the database. I have tried to manually edit the edmx many times without success, getting various mapping errors. EDMX: <?xml version="1.0" encoding="utf-8"?> <edmx:Edmx Version="2.0" xmlns:edmx="http://schemas.microsoft.com/ado/2008/10/edmx"> <!-- EF Runtime content --> <edmx:Runtime> <!-- SSDL content --> <edmx:StorageModels> <Schema Namespace=

Role name in association relationship

由 风流意气都作罢 提交于 2020-01-10 10:42:32
问题 From the UML bible, about role : Role: A role name explains how an object participates in the relationship. Each object needs to hold a reference to the associated object or objects. The reference is held in an attribute value within the object. When there is only one association then there is only one attribute holding a reference. What does this sentence mean? Can anyone please offer an example to explain it? 回答1: Roles:A role name explains how an object participates in the relationship.

Objective-C 源码（五） Associated Objects 的实现原理

由 孤人 提交于 2020-01-07 08:07:13
【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 原文链接： http://blog.leichunfeng.com/blog/2015/06/26/objective-c-associated-objects-implementation-principle/ 我们知道，在 Objective-C 中可以通过 Category 给一个现有的类添加属性，但是却不能添加实例变量，这似乎成为了 Objective-C 的一个明显短板。然而值得庆幸的是，我们可以通过 Associated Objects 来弥补这一不足。 在阅读本文的过程中，读者需要着重关注以下三个问题： 关联对象被存储在什么地方，是不是存放在被关联对象本身的内存中？ 关联对象的五种关联策略有什么区别，有什么坑？ 关联对象的生命周期是怎样的，什么时候被释放，什么时候被移除？ 与 Associated Objects 相关的函数主要有三个，我们可以在 runtime 源码的 runtime.h 文件中找到它们的声明： OBJC_EXPORT void objc_setAssociatedObject(id object, const void *key, id value, objc_AssociationPolicy policy) OBJC_EXPORT id objc

Using has_and_belongs_to_many to get list of associated objects rails

由 别等时光非礼了梦想. 提交于 2020-01-07 06:57:11
问题 I have two models, Clinician and Patient . A clinician has_many: patients and a patient belongs_to :clinician . A third model, SharedPatient is meant to store additional assosiactions between patients and clinicians as a patient can be shared by many other clinicians besides the one it belongs_to . This is done using a has_and_belongs_to_many relationship. See models: class Clinician < ActiveRecord::Base has_many :patients has_and_belongs_to_many :shared_patients, join_table: 'shared_patients

Using has_and_belongs_to_many to get list of associated objects rails

由 蹲街弑〆低调 提交于 2020-01-07 06:57:04
问题 I have two models, Clinician and Patient . A clinician has_many: patients and a patient belongs_to :clinician . A third model, SharedPatient is meant to store additional assosiactions between patients and clinicians as a patient can be shared by many other clinicians besides the one it belongs_to . This is done using a has_and_belongs_to_many relationship. See models: class Clinician < ActiveRecord::Base has_many :patients has_and_belongs_to_many :shared_patients, join_table: 'shared_patients

has_many through with condition not working

由 爱⌒轻易说出口 提交于 2020-01-07 06:28:09
问题 I have a model Grade and a model User. Between grades and user is a many-to-many association through collaborations. in user.rb has_many :grades, through: :collaborations, source: :user works, but i need to get only grades with attribute "archived" = false i tryied has_many :grades, through: :collaborations, source: :user, conditions: [' archived = ? ', false] but it takes all the grades, in other words, the condition is ignored. I can put in my collaborations this condition, but
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