Recent questions tagged activerecord

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activerecord - Rails 3 migrations: Adding reference column?

If I create a new rails 3 migration with (for example) rails g migration tester title:tester user:references ... from the command line? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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activerecord - How do rails association methods work?

How do rails association methods work? Lets consider this example class User < ActiveRecord::Base has_many :articles ... could I validate this? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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activerecord - How to execute a raw update sql with dynamic binding in rails

I want to execute one update raw sql like below: update table set f1=? where f2=? and f3=? This SQL will be ... someone give me any help on it? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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activerecord - With Rails 4, Model.scoped is deprecated but Model.all can't replace it

Starting Rails 4, Model.scoped is now deprecated. DEPRECATION WARNING: Model.scoped is deprecated. Please use Model.all ... should I do here? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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