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:attr:`Field.depends` is used per example to ensure that
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:class:`~trytond.pyson.PYSON` statement could be evaluated.
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.. attribute:: Field.order_field
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The name of a substitute field on which the ordering of records must be done
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This is often used to allow ordering on :class:`Function` fields.
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The name of the field.
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.. method:: Field.convert_domain(domain, tables, Model)
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Convert the simple :ref:`domain <topics-domain>` clause into a SQL
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expression or a new domain.
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Where ``tables`` is a nested dictionary containing the existing joins (and it
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could be updated to add new joins)::
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None: (<Table invoice>, None),
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None: (<Table party>, <join_on sql expression>),
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None: (<Table address>, <join_on sql expression>),
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.. method:: Field.sql_format(value)
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Convert the value to use as parameter of SQL queries.
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.. method:: Field.sql_type()
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Return the namedtuple('SQLType', 'base type') which defines the SQL type to
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use for creation and casting.
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See :ref:`default value <topics-fields_default_value>`
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A class method could be defined for each field which must return a list of SQL
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expression on which to order instead of the field.
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The method signature is::
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order_<field name>(tables)
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Where ``tables`` is a nested dictionary, see :meth:`~Field.convert_domain`.
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the time part of the field. The default value is `%H:%M:%S`.
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The value can be replaced by a :class:`~trytond.pyson.PYSON` statement.
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.. class:: Timestamp(string[, \**options])
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A timestamp, represented in Python by a ``datetime.datetime`` instance.
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A binary field. It will be represented in Python by a ``str`` instance.
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:class:`Binary` has one extra optional argument:
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.. attribute:: Binary.filename
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Name of the field that holds the data's filename. Default value
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is an empty string, which means the data has no filename (in this case, the
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filename is hidden, and the "Open" button is hidden when the widget is set
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where `name` is the name of the field and `clause` is a
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:ref:`domain clause <topics-domain>`.
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It must return a list of :ref:`domain <topics-domain>` clauses.
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It must return a list of :ref:`domain <topics-domain>` clauses but the
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``operand`` can be a SQL query.
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Instance methods:
added
removed
doc/ref/models/fields.rst
