SAINT DOCTRINE:

• TDD, start with integrations tests
• Use Service Objects for interaction between several models
• all texts to i18n (in multilingual projects)
• all bootstrap elements to own CSS classes (grids & utilities are exeptions)
• use BEM methodology for naming CSS classes
• no CSS in HTML
• no JavaScript in HTML
• no new gems/libraries without agreement
• it's forbidden to edit migrations
• no "if", methods, logic in migrations
• no objects in service params