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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)
[schema_type_with_virtual(column), prepare_column_options(column)]
end
def column_spec_for_primary_key(column)
return {} if default_primary_key?(column)
spec = { id: schema_type(column).inspect }
spec.merge!(prepare_column_options(column).except!(:null))
spec[:default] ||= "nil" if explicit_primary_key_default?(column)
spec
end
# This can be overridden on an Adapter level basis to support other
# extended datatypes (Example: Adding an array option in the
# PostgreSQL::ColumnDumper)
def prepare_column_options(column)
spec = {}
if limit = schema_limit(column)
spec[:limit] = limit
end
if precision = schema_precision(column)
spec[:precision] = precision
end
if scale = schema_scale(column)
spec[:scale] = scale
end
default = schema_default(column) if column.has_default?
spec[:default] = default unless default.nil?
spec[:null] = "false" unless column.null
if collation = schema_collation(column)
spec[:collation] = collation
end
spec[:comment] = column.comment.inspect if column.comment.present?
spec
end
# Lists the valid migration options
def migration_keys # :nodoc:
column_options_keys
end
deprecate :migration_keys
private
def default_primary_key?(column)
schema_type(column) == :bigint
end
def explicit_primary_key_default?(column)
false
end
def schema_type_with_virtual(column)
if supports_virtual_columns? && column.virtual?
:virtual
else
schema_type(column)
end
end
def schema_type(column)
if column.bigint?
:bigint
else
column.type
end
end
def schema_limit(column)
limit = column.limit unless column.bigint?
limit.inspect if limit && limit != native_database_types[column.type][:limit]
end
def schema_precision(column)
column.precision.inspect if column.precision
end
def schema_scale(column)
column.scale.inspect if column.scale
end
def schema_default(column)
type = lookup_cast_type_from_column(column)
default = type.deserialize(column.default)
if default.nil?
schema_expression(column)
else
type.type_cast_for_schema(default)
end
end
def schema_expression(column)
"-> { #{column.default_function.inspect} }" if column.default_function
end
def schema_collation(column)
column.collation.inspect if column.collation
end
end
end
end
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