discourse/lib/comment_migration.rb

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class CommentMigration < ActiveRecord::Migration
def comments_up
raise "Not implemented"
end
def up
comments_up.each do |table|
table[1].each do |column|
table_name = table[0]
column_name = column[0]
comment = column[1]
if column_name == :_table
ActiveRecord::Base.exec_sql "COMMENT ON TABLE #{table_name} IS ?", comment
puts " COMMENT ON TABLE #{table_name}"
else
ActiveRecord::Base.exec_sql "COMMENT ON COLUMN #{table_name}.#{column_name} IS ?", comment
puts " COMMENT ON COLUMN #{table_name}.#{column_name}"
end
end
end
end
def comments_down
{}
end
def down
replace_nils(comments_up).deep_merge(comments_down).each do |table|
table[1].each do |column|
table_name = table[0]
column_name = column[0]
comment = column[1]
if column_name == :_table
ActiveRecord::Base.exec_sql "COMMENT ON TABLE #{table_name} IS ?", comment
puts " COMMENT ON TABLE #{table_name}"
else
ActiveRecord::Base.exec_sql "COMMENT ON COLUMN #{table_name}.#{column_name} IS ?", comment
puts " COMMENT ON COLUMN #{table_name}.#{column_name}"
end
end
end
end
private
def replace_nils(hash)
hash.each do |key, value|
if Hash === value
hash[key] = replace_nils value
else
hash[key] = nil
end
end
end
end