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a _�h�1 � @ s� d Z ddlmZ ddlmZ ddlmZ ddlmZ ddlm Z dd lm Z dd lmZ dd l m Z d gZ e jG d d � d e��ZdS )z|MapperProperty implementations. This is a private module which defines the behavior of individual ORM- mapped attributes. � )�absolute_import� )� attributes)�PropComparator)�StrategizedProperty)�_orm_full_deannotate� )�log)�util�� expression�ColumnPropertyc s� e Zd ZdZdZdZejdd�� fdd��Ze� dd �d d � �Z d d � Z e dd� �Z dd� Z� fdd�Zdd� Zejfdd�Zdd� ZG dd� deje�Zd d � Z� ZS ) r z�Describes an object attribute that corresponds to a table column. Public constructor is the :func:`_orm.column_property` function. �column)� _orig_columns�columns�group�deferred� instrument�comparator_factory� descriptor� extension�active_history�expire_on_flush�info�doc� strategy_keyZ_creation_orderZ _is_polymorphic_discriminatorZ_mapped_by_synonymZ_deferred_column_loader)z0.7z�:class:`.AttributeExtension` is deprecated in favor of the :class:`.AttributeEvents` listener interface. The :paramref:`.column_property.extension` parameter will be removed in a future release.)r c sN t t| ��� dd� |D �| _dd� |D �| _|�dd�| _|�dd�| _|�dd �| _|�d | j j �| _ |�d d�| _ |�d d�| _ |�d d�| _|�dd �| _d|v r�|�d�| _d|v r�|�d�| _n6t| j�D ]$}t|dd�}|dur�|| _ �qq�d| _|�r*td| j jd�t|�� ��f ��t�| � d| jfd| jff| _dS )a� Provide a column-level property for use with a mapping. Column-based properties can normally be applied to the mapper's ``properties`` dictionary using the :class:`_schema.Column` element directly. Use this function when the given column is not directly present within the mapper's selectable; examples include SQL expressions, functions, and scalar SELECT queries. The :func:`_orm.column_property` function returns an instance of :class:`.ColumnProperty`. Columns that aren't present in the mapper's selectable won't be persisted by the mapper and are effectively "read-only" attributes. :param \*cols: list of Column objects to be mapped. :param active_history=False: When ``True``, indicates that the "previous" value for a scalar attribute should be loaded when replaced, if not already loaded. Normally, history tracking logic for simple non-primary-key scalar values only needs to be aware of the "new" value in order to perform a flush. This flag is available for applications that make use of :func:`.attributes.get_history` or :meth:`.Session.is_modified` which also need to know the "previous" value of the attribute. :param comparator_factory: a class which extends :class:`.ColumnProperty.Comparator` which provides custom SQL clause generation for comparison operations. :param group: a group name for this property when marked as deferred. :param deferred: when True, the column property is "deferred", meaning that it does not load immediately, and is instead loaded when the attribute is first accessed on an instance. See also :func:`~sqlalchemy.orm.deferred`. :param doc: optional string that will be applied as the doc on the class-bound descriptor. :param expire_on_flush=True: Disable expiry on flush. A column_property() which refers to a SQL expression (and not a single table-bound column) is considered to be a "read only" property; populating it has no effect on the state of data, and it can only return database state. For this reason a column_property()'s value is expired whenever the parent object is involved in a flush, that is, has any kind of "dirty" state within a flush. Setting this parameter to ``False`` will have the effect of leaving any existing value present after the flush proceeds. Note however that the :class:`.Session` with default expiration settings still expires all attributes after a :meth:`.Session.commit` call, however. :param info: Optional data dictionary which will be populated into the :attr:`.MapperProperty.info` attribute of this object. :param extension: an :class:`.AttributeExtension` instance, or list of extensions, which will be prepended to the list of attribute listeners for the resulting descriptor placed on the class. .. seealso:: :ref:`column_property_options` - to map columns while including mapping options :ref:`mapper_column_property_sql_expressions` - to map SQL expressions c S s g | ]}t �|��qS � )r �_labeled��.0�cr r ��/root/rpmbuild/BUILDROOT/imh-python39-modules-3.9.7-92.el8.x86_64/opt/imh-python/lib/python3.9/site-packages/sqlalchemy/orm/properties.py� <listcomp>� � z+ColumnProperty.__init__.<locals>.<listcomp>c S s g | ]}t �t|���qS r )r r r r r r r! r" � s r Nr FZ _instrumentTr r r r r r r z.%s received unexpected keyword argument(s): %sz, r ) �superr �__init__r r �popr r r � __class__� Comparatorr r r r r r r �reversed�getattr� TypeError�__name__�join�sorted�keysr Zset_creation_orderr )�selfr �kwargs�colr �r' r r! r% : sF W�� �� �zColumnProperty.__init__zsqlalchemy.orm.statezsqlalchemy.orm.strategiesc C s |j �| jj|�| j�| j�S �N)Z InstanceStateZ"_instance_level_callable_processor�parentZ class_managerZLoadDeferredColumns�key)r0 �stateZ strategiesr r r! �&_memoized_attr__deferred_column_loader� s �z5ColumnProperty._memoized_attr__deferred_column_loaderc C s | j S )zsAllow the ColumnProperty to work in expression before it is turned into an instrumented attribute. r �r0 r r r! �__clause_element__� s z!ColumnProperty.__clause_element__c C s | j d S )a� Return the primary column or expression for this ColumnProperty. E.g.:: class File(Base): # ... name = Column(String(64)) extension = Column(String(8)) filename = column_property(name + '.' + extension) path = column_property('C:/' + filename.expression) .. seealso:: :ref:`mapper_column_property_sql_expressions_composed` r )r r9 r r r! r � s zColumnProperty.expressionc C s0 | j s d S tj|j| j| �| |�|| jd� d S )N)Z comparator� parententityr )r r Zregister_descriptor�class_r6 r r )r0 Zmapperr r r! �instrument_class� s �z ColumnProperty.instrument_classc sZ t t| ��� t| j�dkrVt| jj��| j�rVt � d| j| jd | jd | j f � d S )Nr z�On mapper %s, primary key column '%s' is being combined with distinct primary key column '%s' in attribute '%s'. Use explicit properties to give each column its own mapped attribute name.r ) r$ r �do_init�lenr �setr5 Z primary_key� issupersetr �warnr6 r9 r3 r r! r> � s ���zColumnProperty.do_initc C s t | j| j| j| jd��S )N)r r r )r r r r r r9 r r r! �copy� s ��zColumnProperty.copyc C s |� | j�j|||d�S )N)�passive)�get_implr6 Zget_committed_value)r0 r7 Zdict_r rD r r r! � _getcommitted s �z ColumnProperty._getcommittedc C st | j s d S | j|v rL|| j } |s.| || j< qp|�| j�} | �||| d � n$|jrp| j|vrp|j|| jgdd� d S )NT)Z no_loader)r r6 rE r@ Z has_identityZ_expire_attributes) r0 �sessionZ source_stateZ source_dictZ dest_stateZ dest_dict�loadZ _recursiveZ_resolve_conflict_map�value�implr r r! �merge s �zColumnProperty.mergec @ sD e Zd ZdZdZdd� Zdd� Zdd� Zd d � Zd d � Z d d� Z dS )zColumnProperty.Comparatora� Produce boolean, comparison, and other operators for :class:`.ColumnProperty` attributes. See the documentation for :class:`.PropComparator` for a brief overview. .. seealso:: :class:`.PropComparator` :class:`.ColumnOperators` :ref:`types_operators` :attr:`.TypeEngine.comparator_factory` )r: r Z expressionsc C s8 | j r| � | jjd �S | jjd �| j| jd��S d S )Nr )r; � parentmapper)�adapter�propr � _annotate� _parententityr9 r r r! �#_memoized_method___clause_element__: s ��z=ColumnProperty.Comparator._memoized_method___clause_element__c C s0 | � � }z|jW S ty* | jj Y S 0 dS )z(The .info dictionary for this attribute.N)r: r �AttributeErrorrN )r0 Zcer r r! �_memoized_attr_infoG s z-ColumnProperty.Comparator._memoized_attr_infoc s6 � j r � fdd�� jjD �S � fdd�� jjD �S dS )z�The full sequence of columns referenced by this attribute, adjusted for any aliasing in progress. .. versionadded:: 1.3.17 c s g | ]}� � |��qS r )rM �r r2 r9 r r! r" X r# zHColumnProperty.Comparator._memoized_attr_expressions.<locals>.<listcomp>c s& g | ] }|� � j� j� jjd ���qS ))r; rL Zorm_key)rO rP rN r6 rT r9 r r! r" \ s ���N)rM rN r r9 r r9 r! �_memoized_attr_expressionsP s �z4ColumnProperty.Comparator._memoized_attr_expressionsc C s t | �� |�S )z�proxy attribute access down to the mapped column. this allows user-defined comparison methods to be accessed. )r* r: )r0 r6 r r r! �_fallback_getattrg s z+ColumnProperty.Comparator._fallback_getattrc O s || � � g|�R i |��S r4 )r: )r0 �op�otherr1 r r r! �operaten s z!ColumnProperty.Comparator.operatec K s" | � � }||�||�|fi |��S r4 )r: Z _bind_param)r0 rW rX r1 r2 r r r! �reverse_operateq s z)ColumnProperty.Comparator.reverse_operateN) r, � __module__� __qualname__�__doc__� __slots__rQ rS rU rV rY rZ r r r r! r( % s r( c C s t | jjj�d | j S )N�.)�strr5 r< r, r6 r9 r r r! �__str__u s zColumnProperty.__str__)r, r[ r\ r] Zstrategy_wildcard_keyr^ r Zdeprecated_paramsr% � dependenciesr8 r: �propertyr r= r> rC r Z PASSIVE_OFFrF rK Z MemoizedSlotsr r( ra � __classcell__r r r3 r! r s( � y � PN)r] � __future__r � r Z interfacesr r r r r �sqlr �__all__Z class_loggerr r r r r! �<module> s
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