Sha256: be6a2a5702d2c040ebc419920296293916b55f91fd3582cd4571bc179d076994
Contents?: true
Size: 1.26 KB
Versions: 7
Compression:
Stored size: 1.26 KB
Contents
module Sequel::Database::SplitAlterTable
private
# Preprocess the array of operations. If it looks like some operations depend
# on results of earlier operations and may require reloading the schema to
# work correctly, split those operations into separate lists, and between each
# list, remove the cached schema so that the later operations deal with the
# then current table schema.
def apply_alter_table(name, ops)
modified_columns = []
op_groups = [[]]
ops.each do |op|
case op[:op]
when :add_column, :set_column_type, :set_column_null, :set_column_default
if modified_columns.include?(op[:name])
op_groups << []
else
modified_columns << op[:name]
end
when :rename_column
if modified_columns.include?(op[:name]) || modified_columns.include?(op[:new_name])
op_groups << []
end
modified_columns << op[:name] unless modified_columns.include?(op[:name])
modified_columns << op[:new_name] unless modified_columns.include?(op[:new_name])
end
op_groups.last << op
end
op_groups.each do |ops|
next if ops.empty?
alter_table_sql_list(name, ops).each{|sql| execute_ddl(sql)}
remove_cached_schema(name)
end
end
end
Version data entries
7 entries across 7 versions & 1 rubygems