U
    mfZ                     @   sf   d Z ddlmZ ddlmZ ddlmZmZ ddlm	Z	 G dd dej
Z
edd	d
dZdd ZdS )z
A Python "serializer". Doesn't do much serializing per se -- just converts to
and from basic Python data types (lists, dicts, strings, etc.). Useful as a basis for
other serializers.
    )apps)base)DEFAULT_DB_ALIASmodels)is_protected_typec                   @   sd   e Zd ZdZdZdd Zdd Zdd Zd	d
 Zdd Z	dd Z
dd Zdd Zdd Zdd ZdS )
Serializerz7
    Serialize a QuerySet to basic Python objects.
    Tc                 C   s   d | _ g | _d S N)_currentobjectsself r   B/tmp/pip-unpacked-wheel-siwebuq3/django/core/serializers/python.pystart_serialization   s    zSerializer.start_serializationc                 C   s   d S r   r   r   r   r   r   end_serialization   s    zSerializer.end_serializationc                 C   s
   i | _ d S r   )r	   r   objr   r   r   start_object   s    zSerializer.start_objectc                 C   s   | j | | d | _d S r   )r
   appendget_dump_objectr	   r   r   r   r   
end_object   s    zSerializer.end_objectc                 C   s@   dt |ji}| jrt|ds2| ||jj|d< | j|d< |S )Nmodelnatural_keypkfields)str_metaZuse_natural_primary_keyshasattr_value_from_fieldr   r	   )r   r   datar   r   r   r   "   s
    
zSerializer.get_dump_objectc                 C   s    | |}t|r|S ||S r   )Zvalue_from_objectr   Zvalue_to_string)r   r   fieldvaluer   r   r   r   )   s    
zSerializer._value_from_fieldc                 C   s   |  ||| j|j< d S r   )r   r	   name)r   r   r    r   r   r   handle_field0   s    zSerializer.handle_fieldc                 C   sP   | j r4t|jjdr4t||j}|r.| }q@d }n| ||}|| j|j< d S )Nr   )	use_natural_foreign_keysr   remote_fieldr   getattrr"   r   r   r	   )r   r   r    relatedr!   r   r   r   handle_fk_field3   s     
zSerializer.handle_fk_fieldc                    sv   |j jjjrrjr*t|j jdr*dd  nfdd t|di |j	t||j	
 } fdd|D j|j	< d S )Nr   c                 S   s   |   S r   )r   r!   r   r   r   	m2m_valueF   s    z.Serializer.handle_m2m_field.<locals>.m2m_valuec                    s     | | jjS r   )r   r   r   r)   r   r   r   r*   K   s    Z_prefetched_objects_cachec                    s   g | ]} |qS r   r   ).0r'   )r*   r   r   
<listcomp>R   s     z/Serializer.handle_m2m_field.<locals>.<listcomp>)r%   Zthroughr   Zauto_createdr$   r   r   r&   getr"   iteratorr	   )r   r   r    Zm2m_iterr   )r*   r   r   handle_m2m_field@   s     
zSerializer.handle_m2m_fieldc                 C   s   | j S r   )r
   r   r   r   r   getvalueT   s    zSerializer.getvalueN)__name__
__module____qualname____doc__Zinternal_use_onlyr   r   r   r   r   r   r#   r(   r/   r0   r   r   r   r   r      s   r   F)usingignorenonexistentc                k   s  | dd}i }| D ]}zt|d }W n" tjk
rL   |rFY qn Y nX i }d|krz"|jj|d||jjj< W n> t	k
r }	 z tj
|	|d |ddW 5 d}	~	X Y nX i }
i }||krdd |j D ||< || }|d  D ]\}}|r||krq|j|}|jrt|jtjrzt||||}W nF tjk
r }	 z$tj
|	j|d |d|	jW 5 d}	~	X Y nX |tjkr|||< n
||
|j< q|jrFt|jtjrFzt||||}W n@ t	k
r" }	 z tj
|	|d |d|W 5 d}	~	X Y nX |tjkr:|||< n
|||j< qz||||j< W q t	k
r }	 z tj
|	|d |d|W 5 d}	~	X Y qX qt|||}t||
|V  qdS )	z
    Deserialize simple Python objects back into Django ORM instances.

    It's expected that you pass the Python objects themselves (instead of a
    stream or a string) to the constructor
    handle_forward_referencesFr   r   Nc                 S   s   h | ]
}|j qS r   )r"   )r+   fr   r   r   	<setcomp>y   s     zDeserializer.<locals>.<setcomp>r   )pop
_get_modelr   DeserializationErrorr   r   Z	to_pythonr-   Zattname	ExceptionZWithDataZ
get_fieldsitems	get_fieldr%   
isinstancer   ZManyToManyRelZdeserialize_m2m_valuesZM2MDeserializationErrorZoriginal_excZDEFER_FIELDr"   ZManyToOneRelZdeserialize_fk_valueZbuild_instanceZDeserializedObject)Zobject_listr5   r6   optionsr7   Zfield_names_cachedZModelr   eZm2m_dataZdeferred_fieldsfield_names
field_nameZfield_valuer    valuesr!   r   r   r   r   DeserializerX   s    	
"   
       

       
   rG   c              	   C   s8   zt | W S  ttfk
r2   td|  Y nX dS )z6Look up a model from an "app_label.model_name" string.zInvalid model identifier: '%s'N)r   Z	get_modelLookupError	TypeErrorr   r<   )Zmodel_identifierr   r   r   r;      s    r;   N)r4   Zdjango.appsr   Zdjango.core.serializersr   Z	django.dbr   r   Zdjango.utils.encodingr   r   rG   r;   r   r   r   r   <module>   s   L Z