seeding

问题 Update 8/29/18 Seeing this issue in inline new -ing of seed data as well. Opened an EF Core issue. Will update the question with any findings. I am trying to use EF Core 2.1's seeding mechanism. However, I want to load the seed data from json flat files rather than hard-coding new C# objects. I wrote the extension method below, which worked well for the initial migration. It looks for files named [MyEntity].json in DataPath and deserializes them into objects. The problem is that if I add a

问题 So, here's my custom rake task: task :backup => :environment do |t| SeedFu::Writer.write('/path/to/file.rb', class_name: 'Category', constraints: [:id] do |w| Category.all.each do |x| w << x end end end And the following result file contains: # DO NOT MODIFY THIS FILE, it was auto-generated. # # Date: 2014-06-15 21:08:13 +0700 # Seeding Category # Written with the command: # # /home/dave/.rvm/gems/ruby-2.1.2/bin/rake backup # Category.seed(:id, #<Category id: 1, name: "foo">, #<Category id: 2

问题 I'm trying to generate a torrent and seed it with python libtorrent, it generates the torrent, but doesn't seed it. I am using libtorrent-0.16.18 with Python3.4 on Ubuntu 14.04 import sys import time import libtorrent as lt fs = lt.file_storage() lt.add_files(fs, "./test.txt") t = lt.create_torrent(fs) t.add_tracker("udp://tracker.publicbt.com:80") t.set_creator("My Torrent") t.set_comment("Test") lt.set_piece_hashes(t, ".") torrent = t.generate() f = open("mytorrent.torrent", "wb") f.write

问题 Organization and User have a many-to-many association through Relationship . Initially I implemented this a 1-to-many association, which worked but now I need it to become a many-to-many through association. So I created the Relationship model and changed the association in the model files. Organization accepts nested attributes for User as in my app I have a joined signup form for the two. Also, I use it in my seeds file: Organization.create!(name: "name", ...).users.create(email: "email

问题 I have 2 models, Courses and Videos, for example. And Courses has many Videos. // course.js 'use strict'; module.exports = (sequelize, DataTypes) => { const Course = sequelize.define('Course', { title: DataTypes.STRING, description: DataTypes.STRING }); Course.associate = models => { Course.hasMany(models.Video); }; return Course; }; // video.js 'use strict'; module.exports = (sequelize, DataTypes) => { const Video = sequelize.define('Video', { title: DataTypes.STRING, description: DataTypes

问题 I just started a new website and I wanted to make use of Eloquent. In the process of seeding my database, I noticed that I would get empty rows added if I had included any kind of constructor on the model that extends eloquent. For example, running this seeder: <?php class TeamTableSeeder extends Seeder { public function run() { DB::table('tm_team')->delete(); Team::create(array( 'city' => 'Minneapolis', 'state' => 'MN', 'country' => 'USA', 'name' => 'Twins' ) ); Team::create(array( 'city' =>

问题 When I run rake db:seed in my Rails app, I'm getting this error: invalid byte sequence in US-ASCII (Argument Error) I just added science_majors and down to my seed file, and now when I run rake db:seed it gives me this error: invalid byte sequence error Why is this, and how can I fix it? part of seeds.rb @college = College.find_or_create_by_name!('University of Pittsburgh') if @college.update_attributes( url: 'university-of-pittsburgh', public: 'Public', years: '4-year', category: 'National

问题 I have created a new clean asp.net 5 project (rc1-final). Using Identity Authentication I just have the ApplicationDbContext.cs with the following code: public class ApplicationDbContext : IdentityDbContext<ApplicationUser> { protected override void OnModelCreating(ModelBuilder builder) { // On event model creating base.OnModelCreating(builder); } } Please note ApplicationDbContext use IdentityDbContext and not DbContext. There is any IdentityConfig.cs. Where i need to put the classic

问题 I want to randomly select n rows from my data set using the sample() function in R . I was getting different outputs each time and hence used set.seed() function to get the same output. I know that each integer in the set.seed() will give me a unique output and the output will be the same if set the same seed. But I'm not able to make out what that integer that is passed as a parameter to the set.seed() function means. Is it just an index that goes into the random generator algorithm or does

问题 Okay so I am using Entity Framework 6.1 and attempting code first with seeding. I have a drop always intializer that ALWAYS WORKS. However I want to use database migration which I have set up and it works. UNTIL I normalize out a table and then try to seed it I get a primary key error. Basically in my context when I uncomment out the changes in the 'TODO' section and the schema changes I get a primary key violation when attempting population of the newly normalized out table. It will work for