foreign-keys

问题 i've a problem with my tabularinline field. I have model like this class Product(models.Model): .... class Pemesanan(models.Model): produks = models.ManyToManyField(Product, verbose_name=u"Kode Produk", through='Foo') class Foo(models.Model): product = models.ForeignKey(Product) ... Class Foo is an intermediary class (manytomany field) with class Pemesanan and Class Product. It has a foreign key field to Class Pemesanan. Class Foo is displayed as an tabularinline in change_form template like

问题 And I solved this problem in VBA using DAO here Using the Oledb framework, I created a function that can look up a record value. However it only gets the raw value. I need to find the value of the column property called "Row Source" Can someone explain to me how to find the foreign key value using Oledb Below is my function for a traditional look up query. string IDatabase.LookupRecord(string column, string table, string lookupColumn, string lookUpValue) { OleDbCommand cmdLookupColumnValue =

问题 im new on mysql workbench, and i tried so many things to put my script working but i simply cant... Ive got these tables: CREATE TABLE Utilizador (email varchar(40) not null, nome varchar(50) not null, dataNascimento date, profissao varchar(50) not null, reputacao double(3,2) unsigned not null, constraint pk_Utilizador primary key(email)) This is the first table created! CREATE TABLE POI (email varchar(40) not null, designacaoPOI varchar(10) not null, coordenadaX int, coordenadaY int,

问题 In a Sqlite database, I have a table Vector3 where I store my vectors X, Y, Z. Vector3 Ids can be referenced by a lot of different fields in different tables. The behavior I'm looking for, is that whenever an entry in another table referencing the Vector3 Id is deleted, the Vector3 row referenced is deleted too. If I put a foreign key on the other tables referencing Vector3 Id, then when a Vector3 entry will be deleted the entry in the other table will be deleted. What I want is the reverse

问题 I am quickly learning the ins and outs of database design (something that, as of a week ago, was new to me), but I am running across some questions that don't seem immediately obvious, so I was hoping to get some clarification. The question I have right is about foreign keys. As part of my design, I have a Company table. Originally, I had included address information directly within the table, but, as I was hoping to achieve 3NF, I broke out the address information into its own table, Address

问题 I cannot figure out if Restkit is able to download an object not present locally, in particular when a foreign key is referring to that missing object in a to-one relationship in Core Data. Take the following example: - contact 1 refers to company 2 contact 1 is present in the local db but company 2 is not when in the UI the user inspects the details of contact 1, then a GET for the contact 1 is performed the GET returns a JSON containing among other contact details the property company_id =

问题 I'm trying to display job offers that are in relation ship with Company (Many To One) but I'm not able to do it. I've tried many loops but I'm not even getting queryset so I must doing it wrong but can't solve what I'm doing wrong. My files models.py class Company(models.Model): # field person with relation many to one (many persons to 1 company) team = models.ManyToManyField('Person') name = models.CharField(max_length=100, blank=False) ... class Job(models.Model): name = models.CharField

问题 I did not found a solution to this, so I want to ask you. The whole thing is that I have 3 tables: Cities, Districts, Institutions. Districts have a relationship with Cities Now when I want to register an Institution, I have to choose a District from which the Institution belongs, but if that City doesn't have any district, I have to choose the City itself. So, the question is, how can I bind these tables for the given situation? P.S. the Districts and Cities must remain bind 回答1: Have 2

问题 I have some code (see below) that populates a table with all the records. I however want to replace the ID that is presented for site_id with its actual name which is stored in another table. The site_id for example is the primary key in a table called sites_tbl , and I want to pull the associated sitename and display this in the table rather than the ID which comes from the sheets_tbl as a foreign key. I assume I need to do some kind of loop, where foreach site_id within the $data variable

问题 A foreign key on a model is not appearing in the Django admin site. This is irrespective of whether the field is explicitly specified in a ModelAdmin instance (fields = ('title', 'field-that-does-not-show-up')) or not. I realize there are many variables that could be causing this behavior. class AdvertiserAdmin(admin.ModelAdmin): search_fields = ['company_name', 'website'] list_display = ['company_name', 'website', 'user'] class AdBaseAdmin(admin.ModelAdmin): list_display = ['title', 'url',