3
v^N                 @   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/usr/lib/python3.6/site-packages/django/core/serializers/python.pystart_serialization   s    zSerializer.start_serializationc             C   s   d S )Nr   )r
   r   r   r   end_serialization   s    zSerializer.end_serializationc             C   s
   i | _ d S )N)r   )r
   objr   r   r   start_object   s    zSerializer.start_objectc             C   s   | j j| j| d | _d S )N)r	   appendget_dump_objectr   )r
   r   r   r   r   
end_object   s    zSerializer.end_objectc             C   sD   dt |ji}| j s"t|d r6| j||jj|d< | j|d< |S )Nmodelnatural_keypkfields)str_metause_natural_primary_keyshasattr_value_from_fieldr   r   )r
   r   datar   r   r   r   "   s
    
zSerializer.get_dump_objectc             C   s    |j |}t|r|S |j|S )N)value_from_objectr   value_to_string)r
   r   fieldvaluer   r   r   r   )   s    
zSerializer._value_from_fieldc             C   s   | j ||| j|j< d S )N)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.|j }q@d }n| j||}|| 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                s`   |j jjjr\jr*t|j jdr*dd  nfdd  fddt||jj	 D j
|j< d S )Nr   c             S   s   | j  S )N)r   )r!   r   r   r   	m2m_valueA   s    z.Serializer.handle_m2m_field.<locals>.m2m_valuec                s    j | | jjS )N)r   r   r   )r!   )r
   r   r   r)   D   s    c                s   g | ]} |qS r   r   ).0r'   )r)   r   r   
<listcomp>G   s    z/Serializer.handle_m2m_field.<locals>.<listcomp>)r%   throughr   auto_createdr$   r   r   r&   r"   iteratorr   )r
   r   r    r   )r)   r
   r   handle_m2m_field>   s
    
zSerializer.handle_m2m_fieldc             C   s   | j S )N)r	   )r
   r   r   r   getvalueJ   s    zSerializer.getvalueN)__name__
__module____qualname____doc__internal_use_onlyr   r   r   r   r   r   r#   r(   r/   r0   r   r   r   r   r      s   r   F)usingignorenonexistentc         )   k   s  |j dd}i }x| D ]}yt|d }W n  tjk
rN   |rHwn Y nX i }d|kry"|jjj|jd||jjj< W n> t	k
r }	 z"tjj
|	|d |jddW Y dd}	~	X nX i }
i }||krdd |jj D ||< || }x|d j D ]\}}|r||krq|jj|}|jrt|jtjrytj||||}W nF tjk
r }	 z&tjj
|	j|d |jd|	jW Y dd}	~	X nX |tjkr|||< n
||
|j< q|jrLt|jtjrLytj||||}W n@ t	k
r( }	 z"tjj
|	|d |jd|W Y dd}	~	X nX |tjkr@|||< n
|||j< qy|j|||j< W q t	k
r }	 z"tjj
|	|d |jd|W Y dd}	~	X qX qW tj|||}tj||
|V  qW 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>k   s    zDeserializer.<locals>.<setcomp>r   )pop
_get_modelr   DeserializationErrorr   r   	to_pythongetattname	ExceptionWithData
get_fieldsitems	get_fieldr%   
isinstancer   ManyToManyReldeserialize_m2m_valuesM2MDeserializationErrororiginal_excDEFER_FIELDr"   ManyToOneReldeserialize_fk_valuebuild_instanceDeserializedObject)object_listr6   r7   optionsr8   Zfield_names_cachedModelr   em2m_datadeferred_fieldsfield_names
field_namefield_valuer    valuesr!   r   r   r   r   DeserializerN   s\    ".2
.
2r[   c             C   s6   y
t j| S  ttfk
r0   tjd|  Y nX dS )z6Look up a model from an "app_label.model_name" string.zInvalid model identifier: '%s'N)r   	get_modelLookupError	TypeErrorr   r=   )Zmodel_identifierr   r   r   r<      s    
r<   N)r4   django.appsr   Zdjango.core.serializersr   	django.dbr   r   django.utils.encodingr   r   r[   r<   r   r   r   r   <module>   s   AH