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Only run the data migration if there are profiles in the db

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This commit is contained in:
Raphael Sofaer 2011-06-27 10:26:12 -07:00
parent c7b4e2b4f4
commit e22701a12d
1 changed files with 23 additions and 19 deletions
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4
db/migrate/20110125190034_unique_index_on_profile.rb
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@ -1,5 +1,7 @@
class UniqueIndexOnProfile < ActiveRecord::Migration class UniqueIndexOnProfile < ActiveRecord::Migration
class Profile < ActiveRecord::Base; end
def self.up def self.up
if Profile.count > 0
conn = ActiveRecord::Base.connection conn = ActiveRecord::Base.connection
columns = conn.columns("profiles").map{|c| c.name} columns = conn.columns("profiles").map{|c| c.name}
["id", "created_at", "updated_at"].each{|n| columns.delete(n)} ["id", "created_at", "updated_at"].each{|n| columns.delete(n)}
@ -22,6 +24,7 @@ class UniqueIndexOnProfile < ActiveRecord::Migration
end end
conn.execute("DELETE FROM profiles conn.execute("DELETE FROM profiles
WHERE profiles.id IN (#{undesired_profile_ids.join(",")});") unless undesired_profile_ids.empty? WHERE profiles.id IN (#{undesired_profile_ids.join(",")});") unless undesired_profile_ids.empty?
end
remove_index :profiles, :person_id remove_index :profiles, :person_id
add_index :profiles, :person_id, :unique => true add_index :profiles, :person_id, :unique => true
@ -29,5 +32,6 @@ class UniqueIndexOnProfile < ActiveRecord::Migration
def self.down def self.down
remove_index :profiles, :person_id remove_index :profiles, :person_id
add_index :profiles, :person_id
end end
end end