448 lines
13 KiB
ReStructuredText
448 lines
13 KiB
ReStructuredText
.. _ref-models:
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.. module:: trytond.model
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=====
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Model
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=====
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.. class:: Model([id[, \**kwargs]])
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This is the base class that every kind of :ref:`model <topics-models>`
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inherits. It defines common attributes of all models.
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Class attributes are:
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.. attribute:: Model.__name__
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It contains the a unique name to reference the model throughout the
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platform.
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.. attribute:: Model._inherits
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It contains a dictionary with one or more :attr:`Model._name` as keys. For each
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key a :class:`~trytond.model.fields.Many2One` field is defined as value. The
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:class:`trytond.model.fields.Many2One` fields must be defined in the the current
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model fields. A referenced model with ``_inherits`` is a generalization_ of the
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current model which is *specialized*. In the specialized model it is possible to
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interact with all attributes and methods of the general model.
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.. _generalization: http://en.wikipedia.org/wiki/Class_diagram#Generalization
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.. attribute:: Model.__rpc__
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It contains a dictionary with method name as key and an instance of
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:class:`trytond.rpc.RPC` as value.
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.. attribute:: Model._error_messages
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It contains a dictionary mapping keywords to an error message. By way of
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example::
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_error_messages = {
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'recursive_categories': 'You can not create recursive categories!',
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'wrong_name': 'You can not use " / " in name field!'
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}
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.. attribute:: Model._rec_name
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It contains the name of the field used as name of records. The default
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value is 'name'.
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.. attribute:: Model.id
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The definition of the field ``id`` of records.
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Class methods:
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.. classmethod:: Model.__setup__()
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Setup the class before adding into the :class:`trytond.pool.Pool`.
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.. classmethod:: Model.__post_setup__()
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Setup the class after added into the :class:`trytond.pool.Pool`.
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.. classmethod:: Model.__register__(module_name)
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Registers the model in ``ir.model`` and ``ir.model.field``.
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.. classmethod:: Model.raise_user_error(error[, error_args[, error_description[, error_description_args[, raise_exception]]]])
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Raises an exception that will be displayed as an error message in the
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client. ``error`` is the key of the error message in ``_error_messages``
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and ``error_args`` is the arguments for the "%"-based substitution of the
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error message. There is the same parameter for an additional description.
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The boolean ``raise_exception`` can be set to ``False`` to retrieve the
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error message strings.
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.. classmethod:: Model.raise_user_warning(warning_name, warning[, warning_args[, warning_description[, warning_description_args]]])
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Raises an exception that will be displayed as a warning message on the
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client, if the user has not yet bypassed it. ``warning_name`` is used to
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uniquely identify the warning. Others parameters are like in
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:meth:`Model.raise_user_error`.
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.. warning::
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It requires that the cursor will be commited as it stores state of the
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warning states by users.
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..
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.. classmethod:: Model.default_get(fields_names[, with_rec_name])
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Return a dictionary with the default values for each field in
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``fields_names``. Default values are defined by the returned value of each
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instance method with the pattern ``default_`field_name`()``.
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``with_rec_name`` allow to add `rec_name` value for each many2one field.
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.. classmethod:: Model.fields_get([fields_names])
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Return the definition of each field on the model.
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=========
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ModelView
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=========
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.. class:: ModelView
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It adds requirements to display a view of the model in the client.
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Class attributes:
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.. attribute:: ModelView._buttons
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It contains a dictionary with button name as key and the states dictionary
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for the button. This states dictionary will be used to generate the views
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containing the button.
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Static methods:
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.. staticmethod:: ModelView.button
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Decorate button method to check group access.
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.. staticmethod:: ModelView.button_action(action)
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Same as :stat:`ModelView.button` but return the action id of the XML `id`
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action.
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Class methods:
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.. classmethod:: ModelView.fields_view_get([view_id[, view_type[, toolbar]]])
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Return a view definition used by the client. The definition is::
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{
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'model': model name,
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'arch': XML description,
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'fields': {
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field name: {
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...
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},
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},
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'toolbar': {
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'print': [
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...
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],
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'action': [
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...
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],
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'relate': [
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...
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],
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},
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}
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.. classmethod:: ModelView.view_toolbar_get()
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Returns the model specific actions in a dictionary with keys:
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- `print`: a list of available reports
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- `action`: a list of available actions
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- `relate`: a list of available relations
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.. classmethod:: ModelView.view_header_get(value[, view_type])
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Returns the window title used by the client for the specific view type.
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============
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ModelStorage
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============
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.. class:: ModelStorage
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It adds storage capability.
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Class attributes are:
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.. attribute:: ModelStorage.create_uid
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The definition of the :class:`trytond.model.fields.Many2One` field
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:attr:`create_uid` of records. It contains the :attr:`id` of the user who
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creates the record.
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.. attribute:: ModelStorage.create_date
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The definition of the :class:`trytond.model.fields.DateTime` field
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:attr:`create_date` of records. It contains the datetime of the creation of
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the record.
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.. attribute:: ModelStorage.write_uid
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The definition of the :class:`trytond.model.fields.Many2One` field
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:attr:`write_uid` of the records.
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It contains the :attr:`id` of the last user who writes on the record.
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.. attribute:: ModelStorage.write_date
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The definition of the :class:`trytond.model.fields.DateTime` field
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:attr:`write_date` of the records. It contains the datetime of the last
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write on the record.
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.. attribute:: ModelStorage.rec_name
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The definition of the :class:`trytond.model.fields.Function` field
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:attr:`rec_name`. It is used in the client to display the records with a
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single string.
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.. attribute:: ModelStorage._constraints
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The list of constraints that each record must respect. The definition is:
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[ ('function name', 'error keyword'), ... ]
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where ``function name`` is the name of an instance or a class method of the
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which must return a boolean (``False`` when the constraint is violated) and
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``error keyword`` is a key of :attr:`Model._error_messages`.
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Static methods:
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.. staticmethod:: ModelStorage.default_create_uid()
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Return the default value for :attr:`create_uid`.
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.. staticmethod:: ModelStorage.default_create_date()
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Return the default value for :attr:`create_date`.
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CLass methods:
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.. classmethod:: ModelStorage.create(values)
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Create a record. ``values`` is a dictionary with fields names as key and
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created values as value and return the new instance.
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.. classmethod:: ModelStorage.trigger_create(record)
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Trigger create actions. It will call actions defined in ``ir.trigger`` if
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``on_create`` is set and ``condition`` is true.
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.. classmethod:: ModelStorage.read(ids[, fields_names])
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Return a list of values for the ids. If ``fields_names`` is set, there will
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be only values for these fields otherwise it will be for all fields.
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.. classmethod:: ModelStorage.write(records, values)
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Write ``values`` on the list of records. ``values`` is a dictionary with
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fields names as key and writen values as value.
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.. classmethod:: ModelStorage.trigger_write_get_eligibles(records)
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Return eligible records for write actions by triggers. This dictionary
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is to pass to :meth:`~ModelStorage.trigger_write`.
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.. classmethod:: ModelStorage.trigger_write(eligibles)
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Trigger write actions. It will call actions defined in ``ir.trigger`` if
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``on_write`` is set and ``condition`` was false before
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:meth:`~ModelStorage.write` and true after.
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.. classmethod:: ModelStorage.delete(records)
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Delete records.
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.. classmethod:: ModelStorage.trigger_delete(records)
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Trigger delete actions. It will call actions defined in ``ir.trigger`` if
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``on_delete`` is set and ``condition`` is true.
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.. classmethod:: ModelStorage.copy(records[, default])
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Duplicate the records. ``default`` is a dictionary of default value for the
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created records.
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.. classmethod:: ModelStorage.search(domain[, offset[, limit[, order[, count]]]])
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Return a list of records that match the :ref:`domain <topics-domain>`.
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.. classmethod:: ModelStorage.search_count(domain)
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Return the number of records that match the :ref:`domain <topics-domain>`.
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.. classmethod:: ModelStorage.search_read(domain[, offset[, limit[, order[, fields_names]]]])
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Call :meth:`search` and :meth:`read` at once.
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Useful for the client to reduce the number of calls.
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.. classmethod:: ModelStorage.search_rec_name(name, clause)
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Searcher for the :class:`trytond.model.fields.Function` field
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:attr:`rec_name`.
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.. classmethod:: ModelStorage.browse(ids)
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Return a list of record instance for the ``ids``.
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.. classmethod:: ModelStorage.export_data(records, fields_names)
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Return a list of list of values for each ``records``.
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The list of values follows ``fields_names``.
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Relational fields are defined with ``/`` at any depth.
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.. classmethod:: ModelStorage.import_data(fields_names, data)
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Create records for all values in ``datas``.
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The field names of values must be defined in ``fields_names``.
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It returns a tuple containing: the number of records imported, the last values
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if failed, the exception if failed and the warning if failed.
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.. classmethod:: ModelStorage.check_xml_record(records, values)
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Verify if the records are originating from XML data. It is used to prevent
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modification of data coming from XML files. This method must be overiden to
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change this behavior.
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.. classmethod:: ModelStorage.check_recursion(records[, parent])
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Helper method that checks if there is no recursion in the tree composed
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with ``parent`` as parent field name.
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Instance methods:
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.. method:: ModelStorage.get_rec_name(name)
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Getter for the :class:`trytond.model.fields.Function` field
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:attr:`rec_name`.
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.. method:: ModelStorage.save()
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Save the modification made on the record instance.
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========
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ModelSQL
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========
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.. class:: ModelSQL
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It implements :class:`ModelStorage` for an SQL database.
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Class attributes are:
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.. attribute:: ModelSQL._table
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The name of the database table which is mapped to the class.
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If not set, the value of :attr:`Model._name` is used with dots converted to
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underscores.
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.. attribute:: ModelSQL._order
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A list of tuples defining the default order of the records:
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[ ('field name', 'ASC'), ('other field name', 'DESC'), ... ]
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where the first element of the tuple is a field name of the model and the
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second is the sort ordering as `ASC` for ascending or `DESC` for
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descending.
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.. attribute:: ModelSQL._order_name
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The name of the field (or an SQL statement) on which the records must be
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sorted when sorting on this model from an other model. If not set,
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:attr:`ModelStorage._rec_name` will be used.
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.. attribute:: ModelSQL._history
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If true, all changes on records will be stored in a history table.
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.. attribute:: ModelSQL._sql_constraints
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A list of SQL constraints that are added on the table:
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[ ('constraint name', 'SQL constraint', 'error message key'), ... ]
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- `constraint name` is the name of the SQL constraint in the database
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- `SQL constraint` is the actual SQL constraint
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- `error message key` is the key of
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:attr:`_sql_error_messages`
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.. attribute:: ModelSQL._sql_error_messages
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Like :attr:`Model._error_messages` but for :attr:`_sql_constraints`
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Class methods:
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.. classmethod:: ModelSQL.default_sequence()
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Return default value for sequence field if the model has one.
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.. classmethod:: ModelSQL.table_query()
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Could be overrided to use a custom SQL query instead of a table of the
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database. It should return a tuple containing SQL query and arguments.
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.. classmethod:: ModelSQL.search_domain(domain[, active_test])
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Convert a :ref:`domain <topics-domain>` into a tuple containing:
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- a SQL clause string
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- a list of arguments for the SQL clause
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- a list of tables used in the SQL clause
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- a list of arguments for the tables
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========
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Workflow
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========
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.. class:: Workflow
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A Mix-in class to handle transition check.
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Class attribute:
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.. attribute:: Workflow._transition_state
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The name of the field that will be used to check state transition.
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.. attribute:: Workflow._transitions
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A set containing tuples of from and to state.
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Static methods:
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.. staticmethod:: Workflow.transition(state)
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Decorate method to filter ids for which the transition is valid and finally
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to update the state of the filtered ids.
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==============
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ModelSingleton
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==============
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.. class:: ModelSingleton
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Modify :class:`ModelStorage` into a singleton_.
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This means that there will be only one record of this model.
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It is commonly used to store configuration value.
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.. _singleton: http://en.wikipedia.org/wiki/Singleton_pattern
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Class methods:
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.. classmethod:: ModelSingleton.get_singleton()
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Return the instance of the unique record if there is one.
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