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module ActiveRecord
module ConnectionAdapters # :nodoc:
# The goal of this module is to move Adapter specific column
# definitions to the Adapter instead of having it in the schema
# dumper itself. This code represents the normal case.
# We can then redefine how certain data types may be handled in the schema dumper on the
# Adapter level by over-writing this code inside the database specific adapters
module ColumnDumper
def column_spec(column, types)
spec = prepare_column_options(column, types)
(spec.keys - [:name, :type]).each{ |k| spec[k].insert(0, "#{k.to_s}: ")}
spec
end
# This can be overridden on a Adapter level basis to support other
# extended datatypes (Example: Adding an array option in the
# PostgreSQLAdapter)
def prepare_column_options(column, types)
spec = {}
spec[:name] = column.name.inspect
spec[:type] = column.type.to_s
spec[:null] = 'false' unless column.null
limit = column.limit || types[column.type][:limit]
spec[:limit] = limit.inspect if limit
spec[:precision] = column.precision.inspect if column.precision
spec[:scale] = column.scale.inspect if column.scale
default = schema_default(column) if column.has_default?
spec[:default] = default unless default.nil?
spec
end
# Lists the valid migration options
def migration_keys
[:name, :limit, :precision, :scale, :default, :null]
end
private
def schema_default(column)
default = column.type_cast_from_database(column.default)
unless default.nil?
column.type_cast_for_schema(default)
end
end
end
end
end
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