Seeding Your Rails Database With A Spreadsheet

Did you find a great spreadsheet you would like to use to seed your database? Or maybe your client has given you an excel sheet of information that you need to seed the database with for their webpage? I’m sure you don’t really want to, nor have the time to copy and paste all of the information into your seed file. This would take precious time away from building out a beautiful application with a bunch of great functionality! Well, you’re in luck, because today I am going to give you a step by step guide to convert your spreadsheet to a CSV file to seed your database with.

Please keep in mind, the steps regarding a spreadsheet will be based off a spreadsheet created using Numbers on a Macbook. Windows may differ in a few keys, but the steps should generally be the same.

Cleaning Up Your Spreadsheet

Each row in your spreadsheet will account for an instance, while each column will be a value within this instance. If your spreadsheet has headers, the header of the column will be the key of the key value pair within this instance. That being said, this guid will assume, your spreadsheet has headers.

Please be sure the spreadsheet is set up with the first row being your headers and every row after that being your values that you would like to convert into an instance, of course matching each column in the row with it’s matching header.

You do not want any additional rows outside of this because it will ruin the set up of information being seeded and could cause null values within your seeded database. A title on your spreadsheet is okay, as long as it does not account for any cells. Your column headers must start on row 1 and your columns must begin at column A.

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Buddha Community

System Databases in SQL Server

Introduction

In SSMS, we many of may noticed System Databases under the Database Folder. But how many of us knows its purpose?. In this article lets discuss about the System Databases in SQL Server.

System Database

Fig. 1 System Databases

There are five system databases, these databases are created while installing SQL Server.

• Master
• Model
• MSDB
• Tempdb
• Resource

Master

• This database contains all the System level Information in SQL Server. The Information in form of Meta data.
• Because of this master database, we are able to access the SQL Server (On premise SQL Server)

Model

• This database is used as a template for new databases.
• Whenever a new database is created, initially a copy of model database is what created as new database.

MSDB

• This database is where a service called SQL Server Agent stores its data.
• SQL server Agent is in charge of automation, which includes entities such as jobs, schedules, and alerts.

TempDB

• The Tempdb is where SQL Server stores temporary data such as work tables, sort space, row versioning information and etc.
• User can create their own version of temporary tables and those are stored in Tempdb.
• But this database is destroyed and recreated every time when we restart the instance of SQL Server.

Resource

• The resource database is a hidden, read only database that holds the definitions of all system objects.
• When we query system object in a database, they appear to reside in the sys schema of the local database, but in actually their definitions reside in the resource db.

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Preventing Duplicates in Databases while using Rails

For anyone creating a database whether through Rails or any other language, ensuring that there are no duplicates is extremely important. Imagine signing up for a service using a username, and learning later on that another user also has the same username. Not only would this be confusing and concerning for the user, but this could (and more than likely would) prevent a myriad of problems for your database.

If you have ever created a database through rails, you have more than likely used the Active Record helper uniqueness to check if an attribute is unique before saving it to the database like so:

class Account < ApplicationRecord
 validates :email, uniqueness: true
end

So what is the uniqueness helper doing for us under the hood? Uniqueness makes a SELECT SQL query to that model’s table to find if the attribute already exists, if it does not exist, it will run INSERT and persist the new instance into the database; if it does exist, however, the instance will not persist.

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Django-allauth: A simple Boilerplate to Setup Authentication

Django-Authentication 

A simple Boilerplate to Setup Authentication using Django-allauth, with a custom template for login and registration using django-crispy-forms.

Getting Started

Prerequisites

• Python 3.8.6 or higher

Project setup

# clone the repo
$ git clone https://github.com/yezz123/Django-Authentication

# move to the project folder
$ cd Django-Authentication

Creating virtual environment

• Create a virtual environment for this project:

# creating pipenv environment for python 3
$ virtualenv venv

# activating the pipenv environment
$ cd venv/bin #windows environment you activate from Scripts folder

# if you have multiple python 3 versions installed then
$ source ./activate

Configured Enviromment

Environment variables

SECRET_KEY = #random string
DEBUG = #True or False
ALLOWED_HOSTS = #localhost
DATABASE_NAME = #database name (You can just use the default if you want to use SQLite)
DATABASE_USER = #database user for postgres
DATABASE_PASSWORD = #database password for postgres
DATABASE_HOST = #database host for postgres
DATABASE_PORT = #database port for postgres
ACCOUNT_EMAIL_VERIFICATION = #mandatory or optional
EMAIL_BACKEND = #email backend
EMAIL_HOST = #email host
EMAIL_HOST_PASSWORD = #email host password
EMAIL_USE_TLS = # if your email use tls
EMAIL_PORT = #email port

change all the environment variables in the .env.sample and don't forget to rename it to .env.

Run the project

After Setup the environment, you can run the project using the Makefile provided in the project folder.

help:
 @echo "Targets:"
 @echo "    make install" #install requirements
 @echo "    make makemigrations" #prepare migrations
 @echo "    make migrations" #migrate database
 @echo "    make createsuperuser" #create superuser
 @echo "    make run_server" #run the server
 @echo "    make lint" #lint the code using black
 @echo "    make test" #run the tests using Pytest

Preconfigured Packages

Includes preconfigured packages to kick start Django-Authentication by just setting appropriate configuration.

Package	Usage
django-allauth	Integrated set of Django applications addressing authentication, registration, account management as well as 3rd party (social) account authentication.
django-crispy-forms	django-crispy-forms provides you with a crispy filter and {% crispy %} tag that will let you control the rendering behavior of your Django forms in a very elegant and DRY way.

Contributing

• Django-Authentication is a simple project, so you can contribute to it by just adding your code to the project to improve it.
• If you have any questions, please feel free to open an issue or create a pull request.

Download Details:
Author: yezz123
Source Code: https://github.com/yezz123/Django-Authentication
License: MIT License

#django #python 

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SingleStore: The One Stop Shop For Everything Data

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