models

Django Admin: How to display value of fields with list_display from two models which are in oneToOne relation?

由 心不动则不痛 提交于 2019-12-20 12:32:20
问题 I belive that the answer to my problem is simple, but I can't find it anywhere. Here is my predicament. I have two models: Member and MemberDetail, which are in oneToOne relation like this: class Member(models.Model): ID = models.AutoField(primary_key=True) FIRST_NAME = models.CharField('First name', max_length=50) LAST_NAME = models.CharField('Last name', max_length=50) def __unicode__(self): return u'%s %s' % (self.FIRST_NAME, self.LAST_NAME) class MemberDetail(models.Model): member =

How to get foreign key values with getattr from models

由 吃可爱长大的小学妹 提交于 2019-12-20 10:43:51
问题 i have a model Project and i am getting the attributes of that with the following instr attr = getattr(project, 'id', None) project is the instance, id is the field and None is the default return type. my question is what if i want to get the F.K keys with this? Get customer name project.customer.name How to get customer name with the above condition? Already Tried if callable(attr): context[node][field] = '%s' % attr() Current Code context = {'project': {}} fields = ('id', 'name', 'category'

3.django Model

由 痴心易碎 提交于 2019-12-20 06:51:02
django ORM基本配置 django中遵循 Code Frist 的原则，即：根据代码中定义的类来自动生成数据库表 1.修改project数据库配置 （1）settigs.py里面 默认 DATABASES = { 'default': { 'ENGINE': 'django.db.backends.sqlite3', 'NAME': os.path.join(BASE_DIR, 'db.sqlite3'), } } 修改为mysql数据库： DATABASES = { 'default': { 'ENGINE': 'django.db.backends.mysql', 'NAME': 'mysql', #数据库名字 'USER': 'root', #账号 'PASSWORD': '123456', #密码 'HOST': '192.168.43.128', #IP 'PORT': '3306', #端口 } } （2）把模块改成pymysql 修改project目录下的init.py import pymysql pymysql.install_as_MySQLdb() 2.创建数据库表结构文件 对应app目录下的models.py （1）生成一个简单的数据库表： from django.db import models class UseInfo(models.Model

IntegrityError: null value in column “city_id ” violates not-null constraint

由 你。 提交于 2019-12-19 06:03:11
问题 I two model: class City(models.Model): name = models.CharField(max_length=50) country = models.OneToOneField(Country) def __unicode__(self): return self.name class UserProfile(models.Model): user = models.OneToOneField(User) city = models.OneToOneField(City) when I syncdb and create admin user : IntegrityError: null value in column "city_id" violates not-null constraint How I can Fix this error? 回答1: city = models.OneToOneField(City) Are you sure you want only one user per city? I think you

When to split up models into multiple database tables?

由 こ雲淡風輕ζ 提交于 2019-12-19 05:13:03
问题 I'm working with Ruby on Rails, but this question I think is broader than that and applies to database design generally. When is it a good idea to split a single model up into multiple tables? For example, assume I have a User model, and the number of fields in the model is really starting to add up. For example, the User can enter his website, his birthday, his time zone, his etc etc. Is there any advantage or disadvantage to splitting up the model, such that maybe the User table only has

Spacy link error

由 二次信任 提交于 2019-12-18 14:38:35
问题 When running: import spacy nlp = spacy.load('en') the following is printed: Warning: no model found for 'en' Only loading the 'en' tokenizer. /site-packages/spacy/data is empty with the exception of the init file. all filepaths are only pointing to my single installation of python. Any help appreciated on resolving this. Thanks! Will 回答1: I had this same issue when I tried this on Windows 10 - the problem was the output of python -m spacy.en.download all said Linking successful but above that

Using multiple PostgreSQL schemas with Rails models

由 柔情痞子 提交于 2019-12-17 17:25:40
问题 I have a PostgreSQL database for my Rails application. In the schema named 'public' the main Rails models tables are stored etc. I have created a 'discogs' schema which will have tables with names that are sometimes the same as in the 'public' schema - which is one of the reasons that I'm using schemas to organize this. How would I setup models from the 'discogs' schema in my app? I will be using Sunspot to let Solr index these models as well. I'm unsure of how you would do this. 回答1:

Reusing a Model Built in R

由 天涯浪子 提交于 2019-12-17 15:03:02
问题 When building a model in R, how do you save the model specifications such that you can reuse it on new data? Let's say I build a logistic regression on historical data but won't have new observations until next month. What's the best approach? Things that I have considered: Saving the model object and loading in a new session I know that some models can be exported with PMML, but haven't really seen anything about importing PMML Simply, I am trying to get a sense of what you do when you need

models.py getting huge, what is the best way to break it up?

由 那年仲夏 提交于 2019-12-17 07:01:44
问题 Directions from my supervisor: "I want to avoid putting any logic in the models.py . From here on out, let's use that as only classes for accessing the database, and keep all logic in external classes that use the models classes, or wrap them." I feel like this is the wrong way to go. I feel that keeping logic out of the models just to keep the file small is a bad idea. If the logic is best in the model, that's where it really should go regardless of file size. So is there a simple way to

Review of Image Super-resolution Reconstruction Based on Deep Learning

由 与世无争的帅哥 提交于 2019-12-16 13:04:57
Abstract With the deep learning method being applied to image super-resolution (SR), SR methods based on deep learning have achieved better reconstruction results than traditional SR methods. This paper briefly summarizes SR methods based on deep learning , anal yz es the characteristics and deficiencies of different network models and compares various deep learning network models on mainstream data set. Keyword: Image super-resolution reconstruction; deep learning; convolutional neural network 1. Introduction Image super-resolution reconstruction is to recover a corresponding high-resolution
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