o
    ×ŸŽiÀ0  ã                   @   s„   d Z ddlmZ ddlmZ ddlmZ ddlmZ ddl	m
Z
 G dd	„ d	e
ƒZG d
d„ deƒZG dd„ deƒZG dd„ deƒZdS )al  
"Rel objects" for related fields.

"Rel objects" (for lack of a better name) carry information about the relation
modeled by a related field and provide some utility functions. They're stored
in the ``remote_field`` attribute of the field.

They also act as reverse fields for the purposes of the Meta API because
they're the closest concept currently available.
é    )Ú
exceptions)Úcached_property)Úmake_hashableé   )ÚBLANK_CHOICE_DASH)ÚFieldCacheMixinc                   @   sZ  e Zd ZdZdZdZdZdZdZdZ						d@dd„Z
edd„ ƒZed	d
„ ƒZedd„ ƒZedd„ ƒZedd„ ƒZedd„ ƒZedd„ ƒZedd„ ƒZedd„ ƒZdd„ Zdd„ Zdd„ Zdd „ Zed!d"„ ƒZd#d$„ Zed%d&„ ƒZd'd(„ Zd)d*„ Zd+d,„ Zde dd-fd.d/„Z!d0d1„ Z"d2d3„ Z#d4d5„ Z$d6d7„ Z%dAd8d9„Z&dAd:d;„Z'ed<d=„ ƒZ(d>d?„ Z)dS )BÚForeignObjectRelzº
    Used by ForeignObject to store information about the relation.

    ``_meta.get_fields()`` returns this class to provide access to the field
    flags for the reverse relation.
    TFNc                 C   sF   || _ || _|| _|| _|d u ri n|| _|| _|| _d| _d| _d S )NFT)	ÚfieldÚmodelÚrelated_nameÚrelated_query_nameÚlimit_choices_toÚparent_linkÚ	on_deleteÚsymmetricalÚmultiple)Úselfr	   Útor   r   r   r   r   © r   úqC:\Users\psant\Downloads\Anu Raj Backend\school\venv\Lib\site-packages\django/db/models/fields/reverse_related.pyÚ__init__'   s   

zForeignObjectRel.__init__c                 C   ó   |   ¡ S ©N)Ú	is_hidden©r   r   r   r   Úhidden@   ó   zForeignObjectRel.hiddenc                 C   ó
   | j  ¡ S r   )r	   r   r   r   r   r   ÚnameD   s   
zForeignObjectRel.namec                 C   s   | j S r   )r	   r   r   r   r   Úremote_fieldH   s   zForeignObjectRel.remote_fieldc                 C   s*   | j d j}t|ƒdkrt d¡‚|d S )z�
        When filtering against this relation, return the field on the remote
        model against which the filtering should happen.
        éÿÿÿÿr   z1Can't use target_field for multicolumn relations.r   N)Ú
path_infosÚtarget_fieldsÚlenr   Z
FieldError)r   r"   r   r   r   Útarget_fieldL   s   ÿzForeignObjectRel.target_fieldc                 C   s   | j jstdƒ‚| j jS )NzVThis property can't be accessed before self.field.contribute_to_class has been called.)r	   r
   ÚAttributeErrorr   r   r   r   Úrelated_modelY   s
   ÿzForeignObjectRel.related_modelc                 C   ó   | j jS r   )r	   Úmany_to_manyr   r   r   r   r(   b   r   zForeignObjectRel.many_to_manyc                 C   r'   r   )r	   Úone_to_manyr   r   r   r   Úmany_to_onef   r   zForeignObjectRel.many_to_onec                 C   r'   r   )r	   r*   r   r   r   r   r)   j   r   zForeignObjectRel.one_to_manyc                 C   r'   r   )r	   Ú
one_to_oner   r   r   r   r+   n   r   zForeignObjectRel.one_to_onec                 C   ó   | j  |¡S r   )r	   Ú
get_lookup)r   Úlookup_namer   r   r   r-   r   ó   zForeignObjectRel.get_lookupc                 C   r   r   )r	   Úget_lookupsr   r   r   r   r0   u   ó   
zForeignObjectRel.get_lookupsc                 C   r,   r   )r	   Úget_transform)r   r   r   r   r   r2   x   r/   zForeignObjectRel.get_transformc                 C   r   r   )r	   Úget_internal_typer   r   r   r   r3   {   r1   z"ForeignObjectRel.get_internal_typec                 C   r'   r   )r	   Údb_typer   r   r   r   r4   ~   r   zForeignObjectRel.db_typec                 C   s    dt | ƒj| jjj| jjjf S )Nz<%s: %s.%s>)ÚtypeÚ__name__r&   Ú_metaZ	app_labelÚ
model_namer   r   r   r   Ú__repr__‚   s
   ýzForeignObjectRel.__repr__c              	   C   s,   | j | j| j| jt| jƒ| j| j| j| j	f	S r   )
r	   r
   r   r   r   r   r   r   r   r   r   r   r   r   Úidentity‰   s   ÷zForeignObjectRel.identityc                 C   s   t || jƒstS | j|jkS r   )Ú
isinstanceÚ	__class__ÚNotImplementedr:   )r   Úotherr   r   r   Ú__eq__—   s   zForeignObjectRel.__eq__c                 C   s
   t | jƒS r   )Úhashr:   r   r   r   r   Ú__hash__œ   r1   zForeignObjectRel.__hash__c                 C   s   | j  ¡ }| dd ¡ |S )Nr!   )Ú__dict__ÚcopyÚpop©r   Ústater   r   r   Ú__getstate__Ÿ   s   
zForeignObjectRel.__getstate__r   c                 C   s@   |p| j }| jj |¡}|r|j|Ž }|r|ng dd„ |D ƒ S )a  
        Return choices with a default blank choices included, for use
        as <select> choices for this field.

        Analog of django.db.models.fields.Field.get_choices(), provided
        initially for utilization by RelatedFieldListFilter.
        c                 S   s   g | ]	}|j t|ƒf‘qS r   )ÚpkÚstr)Ú.0Úxr   r   r   Ú
<listcomp>½   s    z0ForeignObjectRel.get_choices.<locals>.<listcomp>N)r   r&   Z_default_managerZcomplex_filterZorder_by)r   Zinclude_blankZblank_choicer   ZorderingÚqsr   r   r   Úget_choices«   s
   

zForeignObjectRel.get_choicesc                 C   s   t | jƒo| jd dkS )z$Should the related object be hidden?r    ú+N)Úboolr   r   r   r   r   r   ¿   s   zForeignObjectRel.is_hiddenc                 C   r   r   )r	   Zget_reverse_joining_columnsr   r   r   r   Úget_joining_columnsÃ   r1   z$ForeignObjectRel.get_joining_columnsc                 C   s   | j  ||¡S r   )r	   Úget_extra_restriction)r   ÚaliasZrelated_aliasr   r   r   rR   Æ   s   z&ForeignObjectRel.get_extra_restrictionc                 C   s
   d| _ dS )z³
        Set the related field's name, this is not available until later stages
        of app loading, so set_field_name is called from
        set_attributes_from_rel()
        N)Ú
field_namer   r   r   r   Úset_field_nameÉ   s   
zForeignObjectRel.set_field_namec                 C   sX   |r|j n| jj }|p| j}| jr| jr|| jkrd S | jr!| jS |j| jr)d S d S )NZ_setÚ )r7   r&   r   r   r
   r   r8   )r   r
   Úoptsr   r   r   Úget_accessor_nameÓ   s   
z"ForeignObjectRel.get_accessor_namec                 C   s   |r| j  |¡S | j jS r   )r	   Zget_reverse_path_infoZreverse_path_infos)r   Zfiltered_relationr   r   r   Úget_path_infoå   s   zForeignObjectRel.get_path_infoc                 C   r   r   )rY   r   r   r   r   r!   ë   r   zForeignObjectRel.path_infosc                 C   r   )z„
        Return the name of the cache key to use for storing an instance of the
        forward model on the reverse model.
        N)rX   r   r   r   r   Úget_cache_nameï   s   zForeignObjectRel.get_cache_name©NNNFNr   )*r6   Ú
__module__Ú__qualname__Ú__doc__Zauto_createdÚconcreteÚeditableZis_relationÚnullZempty_strings_allowedr   r   r   r   Úpropertyr   r$   r&   r(   r*   r)   r+   r-   r0   r2   r3   r4   r9   r:   r?   rA   rG   r   rN   r   rQ   rR   rU   rX   rY   r!   rZ   r   r   r   r   r      st    
ø











û



r   c                       sX   e Zd ZdZ					d‡ fdd„	Z‡ fdd„Ze‡ fdd	„ƒZd
d„ Zdd„ Z	‡  Z
S )ÚManyToOneRela+  
    Used by the ForeignKey field to store information about the relation.

    ``_meta.get_fields()`` returns this class to provide access to the field
    flags for the reverse relation.

    Note: Because we somewhat abuse the Rel objects by using them as reverse
    fields we get the funny situation where
    ``ManyToOneRel.many_to_one == False`` and
    ``ManyToOneRel.one_to_many == True``. This is unfortunate but the actual
    ManyToOneRel class is a private API and there is work underway to turn
    reverse relations into actual fields.
    NFc	           	   	      s$   t ƒ j|||||||d� || _d S )N©r   r   r   r   r   )Úsuperr   rT   ©	r   r	   r   rT   r   r   r   r   r   ©r<   r   r   r     s   ù

zManyToOneRel.__init__c                    s   t ƒ  ¡ }| dd ¡ |S )Nr&   )re   rG   rD   rE   rg   r   r   rG     s   
zManyToOneRel.__getstate__c                    s   t ƒ j| jf S r   )re   r:   rT   r   rg   r   r   r:   "  s   zManyToOneRel.identityc                 C   s*   | j j | j¡}|jst d| j ¡‚|S )zY
        Return the Field in the 'to' object to which this relationship is tied.
        zNo related field named '%s'N)r
   r7   Ú	get_fieldrT   r_   r   ZFieldDoesNotExist)r   r	   r   r   r   Úget_related_field&  s   ÿzManyToOneRel.get_related_fieldc                 C   s   | j p| jjjj| _ d S r   )rT   r
   r7   rH   r   r   r   r   r   rU   1  s   zManyToOneRel.set_field_namer[   )r6   r\   r]   r^   r   rG   rb   r:   ri   rU   Ú__classcell__r   r   rg   r   rc   ÷   s    ÷rc   c                       s,   e Zd ZdZ					d‡ fdd„	Z‡  ZS )ÚOneToOneRelzº
    Used by OneToOneField to store information about the relation.

    ``_meta.get_fields()`` returns this class to provide access to the field
    flags for the reverse relation.
    NFc	           	   
      s&   t ƒ j||||||||d� d| _d S )Nrd   F)re   r   r   rf   rg   r   r   r   =  s   ø
zOneToOneRel.__init__r[   )r6   r\   r]   r^   r   rj   r   r   rg   r   rk   5  s    ÷rk   c                       sH   e Zd ZdZ							d
‡ fdd„	Ze‡ fdd„ƒZdd	„ Z‡  ZS )ÚManyToManyRelz¼
    Used by ManyToManyField to store information about the relation.

    ``_meta.get_fields()`` returns this class to provide access to the field
    flags for the reverse relation.
    NTc
           
         sR   t ƒ j|||||d� |r|	stdƒ‚|| _|r|stdƒ‚|| _|| _|	| _d S )N)r   r   r   z4Can't supply a through model and db_constraint=Falsez5Cannot specify through_fields without a through model)re   r   Ú
ValueErrorÚthroughÚthrough_fieldsr   Údb_constraint)
r   r	   r   r   r   r   r   rn   ro   rp   rg   r   r   r   ^  s   û
zManyToManyRel.__init__c                    s   t ƒ j| jt| jƒ| jf S r   )re   r:   rn   r   ro   rp   r   rg   r   r   r:   }  s
   ýzManyToManyRel.identityc                 C   sV   | j j}| jr| | jd ¡}n|jD ]}t|ddƒ}|r%|j| jkr% q&q|jd S )zŠ
        Return the field in the 'to' object to which this relationship is tied.
        Provided for symmetry with ManyToOneRel.
        r   r   N)rn   r7   ro   rh   ÚfieldsÚgetattrr
   Zforeign_related_fields)r   rW   r	   Úrelr   r   r   ri   …  s   
€
zManyToManyRel.get_related_field)NNNTNNT)	r6   r\   r]   r^   r   rb   r:   ri   rj   r   r   rg   r   rl   V  s    örl   N)r^   Zdjango.corer   Zdjango.utils.functionalr   Zdjango.utils.hashabler   rV   r   Úmixinsr   r   rc   rk   rl   r   r   r   r   Ú<module>   s     d>!