ERD diagram for associations with information about Markdown 👔 Associations: erdwithassociations.herokuapp.com (ERD with Bachman notation) belongs_to has_one has_many has_many :through has_one :through has_and_belongs_to_many has_and_belongs_to_many vs has_many :through polymorphic association self joins association Markdown: 📓 Writing in GitHub - Markdown Tutorial List of emoji 📖 Wikipedia about Markdown Markdown editors online: GitHub Dillinger StackEdit
