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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 spececific 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
# AR has an optimization which handles zero-scale decimals as integers. This
# code ensures that the dumper still dumps the column as a decimal.
spec[:type] = if column.type == :integer && /^(numeric|decimal)/ =~ column.sql_type
'decimal'
else
column.type.to_s
end
spec[:limit] = column.limit.inspect if column.limit != types[column.type][:limit] && spec[:type] != 'decimal'
spec[:precision] = column.precision.inspect if column.precision
spec[:scale] = column.scale.inspect if column.scale
spec[:null] = 'false' unless column.null
spec[:default] = default_string(column.default) if column.has_default?
spec
end
# Lists the valid migration options
def migration_keys
[:name, :limit, :precision, :scale, :default, :null]
end
private
def default_string(value)
case value
when BigDecimal
value.to_s
when Date, DateTime, Time
"'#{value.to_s(:db)}'"
else
value.inspect
end
end
end
end
end
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