rails-activerecord Archives - Page 2 of 3

How to express a NOT IN query with ActiveRecord/Rails?

I’m hoping there is a easy solution that doesn’t involve find_by_sql, if not then I guess that will have to work. I found ...

May 25, 2022
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ActiveModel::ForbiddenAttributesError when creating new user

I have this model in Ruby but it throws a ActiveModel::ForbiddenAttributesError class User < ActiveRecord::Base attr_accessor :password validates :username, :presence => true, :uniqueness ...

May 24, 2022
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Float vs Decimal in ActiveRecord

Sometimes, Activerecord data types confuse me. Err, often. One of my eternal questions is, for a given case, Should I use :decimal or ...

May 16, 2022
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Ruby on Rails generates model field:type – what are the options for field:type?

I’m trying to generate a new model and forget the syntax for referencing another model’s ID. I’d look it up myself, but I ...

May 15, 2022
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Add a reference column migration in Rails 4

A user has many uploads. I want to add a column to the uploads table that references the user. What should the migration ...

May 12, 2022
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How do you delete an ActiveRecord object?

How do you delete an ActiveRecord object? I looked at Active Record Querying and it does not have anything on deleting that I ...

May 11, 2022
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Rails :include vs. :joins

This is more of a “why do things work this way” question rather than a “I don’t know how to do this” question… ...

May 11, 2022
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Rails where condition using NOT NIL

Using the rails 3 style how would I write the opposite of: Foo.includes(:bar).where(:bars=>{:id=>nil}) I want to find where id is NOT nil. I ...

May 9, 2022
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Rails update_attributes without save?

Is there an alternative to update_attributes that does not save the record? So I could do something like: @car = Car.new(:make => 'GMC') ...

May 8, 2022
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How do I get the name of a Ruby class?

How can I get the class name from an ActiveRecord object? I have: result = User.find(1) I tried: result.class # => User(id: integer, ...

May 7, 2022
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