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Uninitialized constant #{MIGRATION_NAME}::#{TABLE_NAME} when running migration


Uninitialized constant #{MIGRATION_NAME}::#{TABLE_NAME} when running migration

By : user2950834
Date : November 17 2020, 11:58 AM
I think the issue was by ths following , Solution is quite simple actually. When running rake db:migrate, migration tool expects models to exist. Therefore, here, we get a uninitialized constant error. Migration tool is searching a State model and will use it to call create method.
Then, there are several ways to fix this issue. Most simple is to create missing models.
code :
class MyMigration < ActiveRecord::Migration
  def MyTable < ActiveRecord::Base; end

  def change
    # Your migration
  end
end


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rake migration aborted: error with uninitialized constant and migration naming

rake migration aborted: error with uninitialized constant and migration naming


By : Wuma
Date : March 29 2020, 07:55 AM
wish helps you AddNameToSlicks is being requested but you have AddNametoSlicks.
Change to - To
Sequel Migration: uninitialized constant Jsonb (NameError)

Sequel Migration: uninitialized constant Jsonb (NameError)


By : jimmythegreek
Date : March 29 2020, 07:55 AM
like below fixes the issue As by Sequel source code, the column type should not be capitalized. In general, DSL is about defining class methods, not constants.
code :
Sequel.migration do
  up do
    alter_table :same_table do
    #                          ⇓⇓ NOTE SYMBOL     
      add_column :not_working, :jsonb
    end
  end
end

Sequel.migration do
  up do
    create_table :same_table do
    # ⇓ NOTE DOWNCASE
      jsonb :worked
    end
  end
end
rails 5 migration uninitialized constant

rails 5 migration uninitialized constant


By : EpicName
Date : March 29 2020, 07:55 AM
it fixes the issue I have project on rails 4.2 with bunch of migrations. And on rails 4.2 everything works perfectly. , It does not recognize Currency in that file. Create a currency model.
Uninitialized constant after rake db migration

Uninitialized constant after rake db migration


By : Luke Luma
Date : March 29 2020, 07:55 AM
will be helpful for those in need Okay I found out. In 20170620084816_create_measurement_error_category_table.rb I changed
code :
class CreateMeasurementErrorCategoryTable < ActiveRecord::Migration
  def change
    MeasurementErrorCategory.create_table(self, :measurementerrorcategories)
  end
end
class CreateMeasurementErrorCategoryTable < ActiveRecord::Migration
  def create
    MeasurementErrorCategory.create_table(self, :measurementerrorcategories)
  end
end
NameError: uninitialized constant with FriendlyId after migration to Rails4

NameError: uninitialized constant with FriendlyId after migration to Rails4


By : Layla Koral
Date : March 29 2020, 07:55 AM
around this issue I had this same problem with Rails 4 - and I fixed it by restarting spring:
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