Explain valid and invalid in rails?
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How to use two databases into a single application?
What is the difference between save and save?
how can we define Ruby regular expressions?
What is the symbol garbage collector?
Explain the role of sub directory app/controllers and app/helpers.
Explain the controller in rails?
how you can run Rails application without creating databases?
What is rails scaffolding?
what is rake in Rails?
how many types of callbacks available in ror?
Explain model in rails?
Write the command to run the migration.