o
    ˜¨Êh*0  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                   @   sJ  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edd„ ƒZdd „ Zed!d"„ ƒZd#d$„ Zd%d&„ Zd'd(„ Zdedd)fd*d+„Zd,d-„ Z d.d/„ Z!d0d1„ Z"d2d3„ Z#d=d4d5„Z$d=d6d7„Z%ed8d9„ ƒZ&d:d;„ Z'dS )>Ú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   úY/var/www/html/env/lib/python3.10/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   )Ú
path_infosÚtarget_fieldsÚlenr   Ú
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   s   | j  |¡S r   )r	   Ú
get_lookup)r   Úlookup_namer   r   r   r-   r   s   zForeignObjectRel.get_lookupc                 C   r   r   )r	   Úget_internal_typer   r   r   r   r/   u   ó   
z"ForeignObjectRel.get_internal_typec                 C   r(   r   )r	   Údb_typer   r   r   r   r1   x   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_metaÚ	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identityƒ   s   ÷zForeignObjectRel.identityc                 C   s   t || jƒstS | j|jkS r   )Ú
isinstanceÚ	__class__ÚNotImplementedr8   )r   Úotherr   r   r   Ú__eq__‘   s   zForeignObjectRel.__eq__c                 C   s
   t | jƒS r   )Úhashr8   r   r   r   r   Ú__hash__–   r0   zForeignObjectRel.__hash__c                 C   s   | j  ¡ }| dd ¡ |S )Nr!   )Ú__dict__ÚcopyÚpop©r   Ústater   r   r   Ú__getstate__™   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>·   s    z0ForeignObjectRel.get_choices.<locals>.<listcomp>)r   r'   Ú_default_managerÚcomplex_filterÚorder_by)r   Úinclude_blankÚblank_choicer   ÚorderingÚqsr   r   r   Úget_choices¥   s
   

zForeignObjectRel.get_choicesc                 C   s   t | jƒo| jd dkS )z$Should the related object be hidden?r    ú+)Úboolr   r   r   r   r   r   ¹   s   zForeignObjectRel.is_hiddenc                 C   r   r   )r	   Úget_reverse_joining_columnsr   r   r   r   Úget_joining_columns½   r0   z$ForeignObjectRel.get_joining_columnsc                 C   s   | j  ||¡S r   )r	   Úget_extra_restriction)r   ÚaliasÚrelated_aliasr   r   r   rW   À   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_nameÃ   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 )NÚ_setÚ )r4   r'   r   r   r
   r   r6   )r   r
   Úoptsr   r   r   Úget_accessor_nameÍ   s   
z"ForeignObjectRel.get_accessor_namec                 C   s   |r| j  |¡S | j jS r   )r	   Úget_reverse_path_infoÚreverse_path_infos)r   Úfiltered_relationr   r   r   Úget_path_infoß   s   zForeignObjectRel.get_path_infoc                 C   r   r   )rc   r   r   r   r   r!   å   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.
        )r_   r   r   r   r   Úget_cache_nameé   s   zForeignObjectRel.get_cache_name©NNNFNr   )(r3   Ú
__module__Ú__qualname__Ú__doc__Úauto_createdÚconcreteÚeditableÚis_relationÚnullÚempty_strings_allowedr   r   r   r   Úpropertyr   r%   r'   r)   r+   r*   r,   r-   r/   r1   r7   r8   r=   r?   rE   r   rR   r   rV   rW   r[   r_   rc   r!   rd   r   r   r   r   r      sp    
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   rZ   ©	r   r	   r   rZ   r   r   r   r   r   ©r:   r   r   r      s   ù

zManyToOneRel.__init__c                    s   t ƒ  ¡ }| dd ¡ |S )Nr'   )rr   rE   rB   rC   rt   r   r   rE     s   
zManyToOneRel.__getstate__c                    s   t ƒ j| jf S r   )rr   r8   rZ   r   rt   r   r   r8     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')r
   r4   Ú	get_fieldrZ   rj   r   Ú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   )rZ   r
   r4   rF   r   r   r   r   r   r[   +  s   zManyToOneRel.set_field_namere   )r3   rf   rg   rh   r   rE   ro   r8   rw   r[   Ú__classcell__r   r   rt   r   rp   ñ   s    ÷rp   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 )Nrq   F)rr   r   r   rs   rt   r   r   r   7  s   ø
zOneToOneRel.__init__re   )r3   rf   rg   rh   r   rx   r   r   rt   r   ry   /  s    ÷ry   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)rr   r   Ú
ValueErrorÚthroughÚthrough_fieldsr   Údb_constraint)
r   r	   r   r   r   r   r   r|   r}   r~   rt   r   r   r   X  s   û
zManyToManyRel.__init__c                    s   t ƒ j| jt| jƒ| jf S r   )rr   r8   r|   r   r}   r~   r   rt   r   r   r8   w  s
   ýzManyToManyRel.identityc                 C   sV   | j j}| jr| | jd ¡}n|jD ]}t|ddƒ}|r%|j| jkr% n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)r|   r4   r}   ru   ÚfieldsÚgetattrr
   Úforeign_related_fields)r   r^   r	   Úrelr   r   r   rw     s   
€
zManyToManyRel.get_related_field)NNNTNNT)	r3   rf   rg   rh   r   ro   r8   rw   rx   r   r   rt   r   rz   P  s    örz   N)rh   Údjango.corer   Údjango.utils.functionalr   Údjango.utils.hashabler   r]   r   Úmixinsr   r   rp   ry   rz   r   r   r   r   Ú<module>   s     ^>!