我们试图重新命名DB到的列导轨约定:Rails的迁移 - 未定义的方法`'
class MakeRailsy < ActiveRecord::Migration
def change
# Classes
rename_table :Classes, :classes_
rename_table :classes_, :classes
rename_column :classes, :ClassID, :id
rename_column :classes, :ClassNO, :class_no
rename_column :classes, :SE, :se
rename_column :classes, :EE, :ee
rename_column :classes, :CE, :ce
rename_column :classes, :MBA, :mba
rename_column :classes, :CS, :cs
rename_column :classes, :AM, :am
rename_column :classes, :ESL, :esl
rename_column :classes, :U_G, :u_g
%w(ClassName DepartmentID SectionNumber InstructorID Units Location
DaysAndTimes Notes Description).each do |column|
rename_column :classes, column, column.underscore
end
但是,这将引发一个错误:
-- rename_column(:classes, "ClassName", "class_name")
-> 0.0089s
-- ([])
rake aborted!
StandardError: An error has occurred, all later migrations canceled:
undefined method ` ' for #<MakeRailsy:0x007ffa718e1160>/Users/kellyprice/git/transcript_archives/db/migrate/20150401225004_make_railsy.rb:19:in `block in change'
/Users/kellyprice/git/transcript_archives/db/migrate/20150401225004_make_railsy.rb:18:in `each'
/Users/kellyprice/git/transcript_archives/db/migrate/20150401225004_make_railsy.rb:18:in `change'
NoMethodError: undefined method ` ' for #<MakeRailsy:0x007ffa718e1160>
/Users/kellyprice/git/transcript_archives/db/migrate/20150401225004_make_railsy.rb:19:in `block in change'
/Users/kellyprice/git/transcript_archives/db/migrate/2015040122500
要尽量排除范围/语法错误我试过了,无济于事:
self.rename_column(:classes, column, column.underscore)
而且,如果你扁平化循环并手动调用rename_column,上班。
我相信这是在'SectionNumber'一个错字。它现在读取'SectionMumber',其中M. – kwarrick 2015-04-03 20:01:20
提供了整个迁移命名为20150401225004_make_railsy,所以我们可以在第19行很多错误是(读取错误消息) – cristian 2015-04-03 20:22:42
@kwarrick,你是正确的,但即使当我解决这个问题,它会抛出同样的错误。 – kjprice 2015-04-03 21:00:18