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Migrations & Seeding

What are migrations??

Migrations are a way to make database changes or updates, like creating or dropping tables, as well as updating a table with new columns with constraints via generated scripts. We can build these scripts via the command line using knex command line tool.

To learn more about migrations, check out this article on the different types of database migrations!

Creating/Dropping Tables

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Dropping Migration Table, Models, Controller

Command Line

1. Drop Table/Migration

rails generate migration DropTablename

A file will be created, in the db > migrate folder, make sure it looks like:

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FROM ruby:2.4-alpine3.7

# Install dependencies:
# - build-base: To ensure certain gems can be compiled
# - nodejs: Compile assets
# - postgresql-dev postgresql-client: Communicate with postgres through the postgres gem
# - libxslt-dev libxml2-dev: Nokogiri native dependencies
# - imagemagick: for image processing
RUN apk --update add build-base nodejs tzdata postgresql-dev postgresql-client libxslt-dev libxml2-dev imagemagick

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" Ignore some folders and files for CtrlP indexing
let g:ctrlp_custom_ignore = {
  \ 'dir':  '\.git$\|\.yardoc\|node_modules\|log\|tmp$',
  \ 'file': '\.so$\|\.dat$|\.DS_Store$'
  \ }

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def send_text_message(phone_number, message) do
  ExTwilio.Api.create(ExTwilio.Message,
    [to: phone_number, 
     from: Application.get_env(:ex_twilio, :send_number), 
     body: message])
end

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URL="https://raw.githubusercontent.com/git/git/master/contrib/completion/git-completion.bash"


PROFILE="$HOME/.profile"

echo "Downloading git-completion..."
if ! curl "$URL" --silent --output "$HOME/.git-completion.bash"; then
	echo "ERROR: Couldn't download completion script. Make sure you have a working internet connection." && exit 1
fi

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Folder Structure

Motivations

• Clear feature ownership
• Module usage predictibility (refactoring, maintainence, you know what's shared, what's not, prevents accidental regressions, avoids huge directories of not-actually-reusable modules, etc)