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module ActiveRecord
module ConnectionAdapters
class SchemaCache
attr_reader :columns, :columns_hash, :primary_keys, :tables
attr_reader :column_defaults
attr_reader :connection
def initialize(conn)
@connection = conn
@tables = {}
@columns = Hash.new do |h, table_name|
h[table_name] = conn.columns(table_name, "#{table_name} Columns")
end
@columns_hash = Hash.new do |h, table_name|
h[table_name] = Hash[columns[table_name].map { |col|
[col.name, col]
}]
end
@column_defaults = Hash.new do |h, table_name|
h[table_name] = Hash[columns[table_name].map { |col|
[col.name, col.default]
}]
end
@primary_keys = Hash.new do |h, table_name|
h[table_name] = table_exists?(table_name) ?
conn.primary_key(table_name) : 'id'
end
end
# A cached lookup for table existence.
def table_exists?(name)
return @tables[name] if @tables.key? name
@tables[name] = connection.table_exists?(name)
end
# Clears out internal caches:
#
# * columns
# * columns_hash
# * tables
def clear!
@columns.clear
@columns_hash.clear
@column_defaults.clear
@tables.clear
end
# Clear out internal caches for table with +table_name+.
def clear_table_cache!(table_name)
@columns.delete table_name
@columns_hash.delete table_name
@column_defaults.delete table_name
@primary_keys.delete table_name
@tables.delete table_name
end
end
end
end
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