a
    xdG(                     @   sx   d 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Z	G d	d
 d
e	Z
G dd de
ZG dd de	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.
    )
exceptions)cached_property   )BLANK_CHOICE_DASH)FieldCacheMixinc                   @   s  e Zd ZdZdZdZdZdZdZdZ	d2ddZ
edd Zed	d
 Zedd Zedd Zedd Zedd Zedd Zedd Zedd Zdd Zdd Zedd Zdd  Zdedd!fd"d#Zd$d% Zd&d' Zd(d) Zd*d+ Zd3d,d-Z d4d.d/Z!d0d1 Z"dS )5ForeignObjectRelz
    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$i n|| _|| _|| _d| _d| _d S )NFT)	fieldmodelrelated_namerelated_query_namelimit_choices_toparent_link	on_deletesymmetricalmultiple)selfr   tor
   r   r   r   r    r   _/var/www/html/Ranjet/env/lib/python3.9/site-packages/django/db/models/fields/reverse_related.py__init__&   s    zForeignObjectRel.__init__c                 C   s   |   S N)	is_hiddenr   r   r   r   hidden7   s    zForeignObjectRel.hiddenc                 C   s
   | j  S r   )r   r   r   r   r   r   name;   s    zForeignObjectRel.namec                 C   s   | j S r   )r   r   r   r   r   remote_field?   s    zForeignObjectRel.remote_fieldc                 C   s,   |   d j}t|dkr$td|d S )z
        When filtering against this relation, return the field on the remote
        model against which the filtering should happen.
        r   z1Can't use target_field for multicolumn relations.r   )get_path_infotarget_fieldslenr   Z
FieldError)r   r   r   r   r   target_fieldC   s    
zForeignObjectRel.target_fieldc                 C   s   | j jstd| j jS )NzVThis property can't be accessed before self.field.contribute_to_class has been called.)r   r	   AttributeErrorr   r   r   r   related_modelN   s
    zForeignObjectRel.related_modelc                 C   s   | j jS r   )r   many_to_manyr   r   r   r   r#   U   s    zForeignObjectRel.many_to_manyc                 C   s   | j jS r   )r   one_to_manyr   r   r   r   many_to_oneY   s    zForeignObjectRel.many_to_onec                 C   s   | j jS r   )r   r%   r   r   r   r   r$   ]   s    zForeignObjectRel.one_to_manyc                 C   s   | j jS r   )r   
one_to_oner   r   r   r   r&   a   s    zForeignObjectRel.one_to_onec                 C   s   | j |S r   )r   
get_lookup)r   lookup_namer   r   r   r'   e   s    zForeignObjectRel.get_lookupc                 C   s
   | j  S r   )r   get_internal_typer   r   r   r   r)   h   s    z"ForeignObjectRel.get_internal_typec                 C   s   | j jS r   )r   db_typer   r   r   r   r*   k   s    zForeignObjectRel.db_typec                 C   s    dt | j| jjj| jjjf S )Nz<%s: %s.%s>)type__name__r"   _metaZ	app_label
model_namer   r   r   r   __repr__o   s
    zForeignObjectRel.__repr__r   c                 C   s@   |p| j }| jj|}|r&|j| }|r.|ng dd |D  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|fqS r   )pkstr).0xr   r   r   
<listcomp>   s   z0ForeignObjectRel.get_choices.<locals>.<listcomp>)r   r"   Z_default_managerZcomplex_filterZorder_by)r   Zinclude_blankZblank_choicer   Zorderingqsr   r   r   get_choicesv   s    

zForeignObjectRel.get_choicesc                 C   s   t | jo| jd dkS )z$Should the related object be hidden?r   +)boolr
   r   r   r   r   r      s    zForeignObjectRel.is_hiddenc                 C   s
   | j  S r   )r   Zget_reverse_joining_columnsr   r   r   r   get_joining_columns   s    z$ForeignObjectRel.get_joining_columnsc                 C   s   | j |||S r   )r   get_extra_restriction)r   Zwhere_classaliasZrelated_aliasr   r   r   r:      s    z&ForeignObjectRel.get_extra_restrictionc                 C   s
   d| _ dS )z
        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)
field_namer   r   r   r   set_field_name   s    zForeignObjectRel.set_field_namec                 C   sV   |r
|j n| jj }|p| j}| jr6| jr6|| jkr6d S | jrB| jS |j| jrPdnd S )NZ_set )r-   r"   r   r   r	   r
   r.   )r   r	   optsr   r   r   get_accessor_name   s    
z"ForeignObjectRel.get_accessor_namec                 C   s   | j |S r   )r   Zget_reverse_path_info)r   Zfiltered_relationr   r   r   r      s    zForeignObjectRel.get_path_infoc                 C   s   |   S )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   get_cache_name   s    zForeignObjectRel.get_cache_name)NNNFN)N)N)#r,   
__module____qualname____doc__Zauto_createdconcreteeditableZis_relationnullZempty_strings_allowedr   r   r   r   propertyr   r    r"   r#   r%   r$   r&   r'   r)   r*   r/   r   r6   r   r9   r:   r=   r@   r   rA   r   r   r   r   r      sV     















r   c                       s:   e Zd ZdZd fdd	Zdd Zdd	 Zd
d Z  ZS )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  j|||||||d || _d S )Nr
   r   r   r   r   )superr   r<   	r   r   r   r<   r
   r   r   r   r   	__class__r   r   r      s    	zManyToOneRel.__init__c                 C   s   | j  }|dd  |S )Nr"   )__dict__copypop)r   stater   r   r   __getstate__   s    
zManyToOneRel.__getstate__c                 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	   r-   	get_fieldr<   rE   r   ZFieldDoesNotExist)r   r   r   r   r   get_related_field   s    zManyToOneRel.get_related_fieldc                 C   s   | j p| jjjj| _ d S r   )r<   r	   r-   r0   r   r   r   r   r   r=      s    zManyToOneRel.set_field_name)NNNFN)	r,   rB   rC   rD   r   rS   rU   r=   __classcell__r   r   rM   r   rI      s     	rI   c                       s"   e Zd ZdZd fdd	Z  ZS )OneToOneRelz
    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  j||||||||d d| _d S )NrJ   F)rK   r   r   rL   rM   r   r   r      s    	zOneToOneRel.__init__)NNNFN)r,   rB   rC   rD   r   rV   r   r   rM   r   rW      s     rW   c                       s*   e Zd ZdZd fdd	Zdd Z  ZS )	ManyToManyRelz
    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  j|||||d |r&|	s&td|| _|r<|s<td|| _|| _|	| _d S )N)r
   r   r   z4Can't supply a through model and db_constraint=Falsez5Cannot specify through_fields without a through model)rK   r   
ValueErrorthroughthrough_fieldsr   db_constraint)
r   r   r   r
   r   r   r   rZ   r[   r\   rM   r   r   r     s    zManyToManyRel.__init__c                 C   sV   | j j}| jr || jd }n,|jD ]$}t|dd}|r&|j| jkr& qLq&|jd S )z
        Return the field in the 'to' object to which this relationship is tied.
        Provided for symmetry with ManyToOneRel.
        r   r   N)rZ   r-   r[   rT   fieldsgetattrr	   Zforeign_related_fields)r   r?   r   relr   r   r   rU     s    
zManyToManyRel.get_related_field)NNNTNNT)r,   rB   rC   rD   r   rU   rV   r   r   rM   r   rX      s      rX   N)rD   Zdjango.corer   Zdjango.utils.functionalr   r>   r   Zmixinsr   r   rI   rW   rX   r   r   r   r   <module>   s    '.