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6+ curated questions with the same answer shape every time: quick recap, deep dive, pitfalls, and follow-ups. Coverage includes crud basics, validations basics, associations basics, migrations basics.
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Topics follow a teaching order. Each answer ends with a clear Next question control so you can move forward without hunting the list.
Active Record basics interview questions for freshers cover the database layer that every Rails developer touches every day. This module covers the ORM concept (the model maps to a database table — Post model → posts table, user_id foreign key), CRUD operations (create/find/find_by/all/where/update/save/destroy) and the bang vs non-bang semantics (save returns boolean, save! raises exception), validations (presence, uniqueness, format) and how to check valid? and read errors.full_messages, basic associations (belongs_to adds the foreign key, has_many is the inverse), dependent: :destroy for cascade deletion, migrations (rails generate model, the change method, db:migrate, db:rollback), schema.rb as the source of truth, and scopes at a basic level. Every answer shows the Ruby code and explains the SQL it produces.
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Topics are ordered for learning. Within each topic, rows are numbered 1–6 globally so you always know where you are. Collapse topics if you want a lighter view — use Expand all when you need the full list again.
Numbers 1–6 follow the order we recommend — click any row to open the full answer, or use the sticky Next link at the bottom of each page to go Q1 → Q6.