o
    þÞhôK  ã                   @   s  d Z ddlZddlZddlZddlmZ ddlmZ ddlm	Z	 ddl
mZmZmZmZmZ ddlmZ ddlmZ dd	lmZ dd
lmZ e d¡ZeddƒZdd„ ZG dd„ dejƒZG dd„ dƒZG dd„ dƒZG dd„ dƒZ dd„ Z!dd„ Z"dd„ Z#G dd„ dƒZ$dS ) zî
Various data structures used in query construction.

Factored out from django.db.models.query to avoid making the main module very
large and/or so that they can be used by other modules without getting into
circular import difficulties.
é    N)Ú
namedtuple)Únullcontext)Ú
FieldError)ÚDEFAULT_DB_ALIASÚDatabaseErrorÚconnectionsÚmodelsÚtransaction)Ú
LOOKUP_SEP)Útree)Úcached_property)Úmake_hashableúdjango.db.modelsÚPathInfozGfrom_opts to_opts target_fields join_field m2m direct filtered_relationc                 c   s(   � | V  |   ¡ D ]	}t|ƒE d H  qd S ©N)Ú__subclasses__Ú
subclasses©ÚclsÚsubclass© r   ú\/var/www/html/premium_crap/venv/lib/python3.10/site-packages/django/db/models/query_utils.pyr   !   s
   €ÿr   c                       s¼   e Zd ZdZdZdZdZeZdZdddœ‡ fd	d
„
Z	dd„ Z
dd„ Zdd„ Zdd„ Zdd„ Z	d'dd„Zdd„ Zdd„ Zefdd„Zdd„ Zedd „ ƒZd!d"„ Zd#d$„ Zed%d&„ ƒZ‡  ZS )(ÚQze
    Encapsulate filters as objects that can then be combined logically (using
    `&` and `|`).
    ÚANDÚORÚXORTNF)Ú
_connectorÚ_negatedc                   s&   t ƒ jg |¢t| ¡ ƒ¢||d� d S )N)ÚchildrenÚ	connectorÚnegated)ÚsuperÚ__init__ÚsortedÚitems)Úselfr   r   ÚargsÚkwargs©Ú	__class__r   r   r"   4   s
   
ýz
Q.__init__c                 C   sb   t |ddƒdu rt|ƒ‚| s| ¡ S |st|tƒr|  ¡ S | j|d�}| | |¡ | ||¡ |S )NÚconditionalF)r   )ÚgetattrÚ	TypeErrorÚcopyÚ
isinstancer   ÚcreateÚadd)r%   ÚotherÚconnÚobjr   r   r   Ú_combine;   s   z
Q._combinec                 C   ó   |   || j¡S r   )r4   r   ©r%   r1   r   r   r   Ú__or__H   ó   zQ.__or__c                 C   r5   r   )r4   r   r6   r   r   r   Ú__and__K   r8   z	Q.__and__c                 C   r5   r   )r4   r   r6   r   r   r   Ú__xor__N   r8   z	Q.__xor__c                 C   s   |   ¡ }| ¡  |S r   )r-   Únegate)r%   r3   r   r   r   Ú
__invert__Q   s   zQ.__invert__c                 C   s(   |j | ||dd|d�\}}| |¡ |S )NF)Úallow_joinsÚ
split_subqÚcheck_filterableÚ	summarize)Ú_add_qÚpromote_joins)r%   Úqueryr=   Úreuser@   Úfor_saveÚclauseÚjoinsr   r   r   Úresolve_expressionV   s   
ú
zQ.resolve_expressionc                 C   s  |s| S | j | j| jd�}| jD ]s}|}t|tƒrx|\}}t|v r*| td¡\}}n|}d }t 	|¡}	|	 
|¡ }
|	urw|d u rBd}|
 |¡ }d u r_|
 |¡ }d ur_||
ƒ}
d}|
 |¡}|d u rn|dkrn|
 d¡}d}|d urw||
|ƒ}n| 
|¡}|j |¡ q|S )N)r   r    é   ÚexactÚisnullT)r/   r   r    r   r.   Útupler
   Úrsplitr   ÚFÚreplace_expressionsÚ
get_lookupÚget_transformÚappend)r%   ÚreplacementsÚcloneÚchildÚchild_replacementÚlhsÚrhsÚpathÚlookupÚfieldÚfield_replacementÚlookup_classÚtransform_classr   r   r   rO   f   sB   


þþ


€
zQ.replace_expressionsc                 c   sJ   � | V  | j D ]}t|tƒr|d }t|dƒr| ¡ E dH  q|V  qdS )zg
        Recursively yield this Q object and all subexpressions, in depth-first
        order.
        rI   ÚflattenN)r   r.   rL   Úhasattrr_   )r%   rU   r   r   r   r_   �   s   €


ùz	Q.flattenc              
   C   sJ  ddl m}m} ddlm} ddlm} ddlm} |dƒ}| 	¡ D ]\}	}
t
|
dƒs/||
ƒ}
|j|
|	dd	� q"| |d
ƒd¡ t| }|jjrV| t|| d|ƒ d�ƒ¡ n| | ¡ |j|d�}|jrjtj|d�ntƒ }z|� | |¡duW  d  ƒ W S 1 sƒw   Y  W dS  ty¤ } zt d| |¡ W Y d}~dS d}~ww )z|
        Do a database query to check if the expressions of the Q instance
        matches against the expressions.
        r   )ÚBooleanFieldÚValue)ÚCoalesce)ÚQuery)ÚSINGLENrH   F)ÚselectrI   Ú_checkT)Úoutput_field)Úusingz.Got a database error calling check() on %r: %s)Údjango.db.modelsra   rb   Údjango.db.models.functionsrc   Údjango.db.models.sqlrd   Údjango.db.models.sql.constantsre   r$   r`   Úadd_annotationr   ÚfeaturesÚsupports_comparing_boolean_exprÚadd_qr   Úget_compilerÚin_atomic_blockr	   Úatomicr   Úexecute_sqlr   ÚloggerÚwarning)r%   Úagainstri   ra   rb   rc   rd   re   rC   ÚnameÚvalueÚ
connectionÚcompilerÚcontext_managerÚer   r   r   Úcheckœ   s8   

ÿý(ÿ€þzQ.checkc                 C   sf   d| j j| j jf }| d¡r| dd¡}t| jƒ}i }| j| jkr'| j|d< | j	r.d|d< |||fS )Nz%s.%szdjango.db.models.query_utilsr   r   Tr   )
r)   Ú
__module__Ú__name__Ú
startswithÚreplacerL   r   r   Údefaultr    )r%   rY   r&   r'   r   r   r   ÚdeconstructÀ   s   



zQ.deconstructc                 C   sb   |   ¡ \}}}|g| ¡ ¢}|D ]}t|tƒr'|\}}t|ƒ}| ||f¡ q| |¡ qt|ƒS r   )r…   r$   r.   rL   r   rR   )r%   rY   r&   r'   ÚidentityrU   Úargrz   r   r   r   r†   Ì   s   
z
Q.identityc                 C   s   t |tƒstS |j| jkS r   )r.   r   ÚNotImplementedr†   r6   r   r   r   Ú__eq__Ù   s   
zQ.__eq__c                 C   s
   t | jƒS r   )Úhashr†   )r%   r   r   r   Ú__hash__Þ   ó   
z
Q.__hash__c                 C   s    ddl m} dd„ | | ¡D ƒS )zŽ
        Retrieve all base fields referenced directly or through F expressions
        excluding any fields referenced through joins.
        r   )rC   c                 S   s   h | ]
}|  td ¡d ’qS )rI   r   )Úsplitr
   )Ú.0rU   r   r   r   Ú	<setcomp>ê   s    ÿz+Q.referenced_base_fields.<locals>.<setcomp>)rl   rC   Úget_children_from_q)r%   rC   r   r   r   Úreferenced_base_fieldsá   s   ÿzQ.referenced_base_fields)NTNFF)r�   r€   Ú__qualname__Ú__doc__r   r   r   r„   r*   r"   r4   r7   r9   r:   r<   rH   rO   r_   r   r   r…   r   r†   r‰   r‹   r‘   Ú__classcell__r   r   r(   r   r   '   s2    
ÿ'$
r   c                   @   s*   e Zd ZdZdd„ Zd	dd„Zdd„ ZdS )
ÚDeferredAttributez„
    A wrapper for a deferred-loading field. When the value is read from this
    object the first time, the query is executed.
    c                 C   s
   || _ d S r   )r[   )r%   r[   r   r   r   r"   õ   rŒ   zDeferredAttribute.__init__Nc                 C   sr   |du r| S |j }| jj}||vr5|  |¡}|du r1| ¡ s&| jjr&tdƒ‚|j|gd� || S |||< || S )zx
        Retrieve and caches the value from the datastore on the first lookup.
        Return the cached value.
        Nz4Cannot read a generated field from an unsaved model.)Úfields)Ú__dict__r[   ÚattnameÚ_check_parent_chainÚ
_is_pk_setÚ	generatedÚAttributeErrorÚrefresh_from_db)r%   Úinstancer   ÚdataÚ
field_nameÚvalr   r   r   Ú__get__ø   s   
ÿÿzDeferredAttribute.__get__c                 C   s6   |j }| | jj¡}| jjr| j|krt||jƒS dS )zÁ
        Check if the field value can be fetched from a parent field already
        loaded in the instance. This can be done if the to-be fetched
        field is a primary key field.
        N)Ú_metaÚget_ancestor_linkr[   ÚmodelÚprimary_keyr+   r˜   )r%   rž   ÚoptsÚ
link_fieldr   r   r   r™     s
   z%DeferredAttribute._check_parent_chainr   )r�   r€   r’   r“   r"   r¢   r™   r   r   r   r   r•   ï   s
    
r•   c                   @   s    e Zd ZdZdd„ Zdd„ ZdS )Úclass_or_instance_methodzŒ
    Hook used in RegisterLookupMixin to return partial functions depending on
    the caller type (instance or class of models.Field).
    c                 C   s   || _ || _d S r   )Úclass_methodÚinstance_method)r%   rª   r«   r   r   r   r"   "  s   
z!class_or_instance_method.__init__c                 C   s$   |d u rt  | j|¡S t  | j|¡S r   )Ú	functoolsÚpartialrª   r«   )r%   rž   Úownerr   r   r   r¢   &  s   z class_or_instance_method.__get__N)r�   r€   r’   r“   r"   r¢   r   r   r   r   r©     s    r©   c                   @   s°   e Zd Zdd„ Zejdd„ ƒZdd„ ZeeeƒZ	e
eƒZdd„ Zd	d
„ Zedd„ ƒZe
dd„ ƒZddd„Zddd„ZeeeƒZe
eƒZddd„Zddd„ZeeeƒZe
eƒZdS )ÚRegisterLookupMixinc                 C   s   |   ¡  |d ¡S r   )Úget_lookupsÚget)r%   Úlookup_namer   r   r   Ú_get_lookup-  s   zRegisterLookupMixin._get_lookupc                 C   s   dd„ t  | ¡D ƒ}|  |¡S )Nc                 S   s   g | ]	}|j  d i ¡‘qS )Úclass_lookups)r—   r±   )rŽ   Úparentr   r   r   Ú
<listcomp>2  s    ÿz9RegisterLookupMixin.get_class_lookups.<locals>.<listcomp>)ÚinspectÚgetmroÚmerge_dicts)r   r´   r   r   r   Úget_class_lookups0  s   ÿ
z%RegisterLookupMixin.get_class_lookupsc                 C   s(   |   ¡ }t| dd ƒ }ri |¥|¥S |S ©NÚinstance_lookups)rº   r+   )r%   r´   r¼   r   r   r   Úget_instance_lookups7  s   z(RegisterLookupMixin.get_instance_lookupsc                 C   óN   ddl m} |  |¡}|d u rt| dƒr| j |¡S |d ur%t||ƒs%d S |S )Nr   )ÚLookuprh   )Údjango.db.models.lookupsr¿   r³   r`   rh   rP   Ú
issubclass)r%   r²   r¿   Úfoundr   r   r   rP   @  ó   
zRegisterLookupMixin.get_lookupc                 C   r¾   )Nr   )Ú	Transformrh   )rÀ   rÄ   r³   r`   rh   rQ   rÁ   )r%   r²   rÄ   rÂ   r   r   r   rQ   J  rÃ   z!RegisterLookupMixin.get_transformc                 C   s    i }t | ƒD ]}| |¡ q|S )z«
        Merge dicts in reverse to preference the order of the original list. e.g.,
        merge_dicts([a, b]) will preference the keys in 'a' over those in 'b'.
        )ÚreversedÚupdate)ÚdictsÚmergedÚdr   r   r   r¹   T  s   zRegisterLookupMixin.merge_dictsc                 C   s   t | ƒD ]}|j ¡  qd S r   )r   rº   Úcache_clearr   r   r   r   Ú_clear_cached_class_lookups_  s   ÿz/RegisterLookupMixin._clear_cached_class_lookupsNc                 C   s4   |d u r|j }d| jvri | _|| j|< |  ¡  |S )Nr´   )r²   r—   r´   rË   ©r   rZ   r²   r   r   r   Úregister_class_lookupd  s   

z)RegisterLookupMixin.register_class_lookupc                 C   s,   |d u r|j }d| jvri | _|| j|< |S r»   )r²   r—   r¼   ©r%   rZ   r²   r   r   r   Úregister_instance_lookupm  s   

z,RegisterLookupMixin.register_instance_lookupc                 C   s"   |du r|j }| j|= |  ¡  dS )zn
        Remove given lookup from cls lookups. For use in tests only as it's
        not thread-safe.
        N)r²   r´   rË   rÌ   r   r   r   Ú_unregister_class_lookupz  s   z,RegisterLookupMixin._unregister_class_lookupc                 C   s   |du r|j }| j|= dS )zs
        Remove given lookup from instance lookups. For use in tests only as
        it's not thread-safe.
        N)r²   r¼   rÎ   r   r   r   Ú_unregister_instance_lookup„  s   z/RegisterLookupMixin._unregister_instance_lookupr   )r�   r€   r’   r³   r¬   Úcacherº   r½   r©   r°   ÚclassmethodrP   rQ   Ústaticmethodr¹   rË   rÍ   rÏ   Úregister_lookuprÐ   rÑ   Ú_unregister_lookupr   r   r   r   r¯   ,  s2    








	ÿ


	ÿr¯   c                 C   sd   | j sdS t| j ddƒrdS |s| j S | j|vrdS |r0| |vr0td| jjj› d| j› d�ƒ‚dS )aØ  
    Return whether `field` should be used to descend deeper for
    `select_related()` purposes.

    Arguments:
     * `field` - the field to be checked. Can be either a `Field` or
       `ForeignObjectRel` instance.
     * `restricted` - a boolean field, indicating if the field list has been
       manually restricted using a select_related() clause.
     * `requested` - the select_related() dictionary.
     * `select_mask` - the dictionary of selected fields.
    FÚparent_linkzField Ú.zM cannot be both deferred and traversed using select_related at the same time.T)Úremote_fieldr+   Únullry   r   r¥   r£   Úobject_name)r[   Ú
restrictedÚ	requestedÚselect_maskr   r   r   Úselect_related_descend“  s   
ÿrß   c                 C   sL   t dt| ƒd ƒD ]}t | d|… ¡}| |¡r#|| |d… f  S q	dS )zÕ
    Check if the lookup_parts contains references to the given annotations set.
    Because the LOOKUP_SEP is contained in the default annotation names, check
    each prefix of the lookup_parts for a match.
    rI   r   N)Nr   )ÚrangeÚlenr
   Újoinr±   )Úlookup_partsÚannotationsÚnÚlevel_n_lookupr   r   r   Úrefs_expression¹  s   
ÿrç   c                    s,   ‡ fdd„}||ƒpt |ddƒo||jjƒS )zÞ
    Check that self.model is compatible with target_opts. Compatibility
    is OK if:
      1) model and opts match (where proxy inheritance is removed)
      2) model is parent of opts' model or the other way around
    c                    s&   ˆ j j| jkp| jˆ j jv pˆ | jv S r   )r£   Úconcrete_modelÚall_parents)r§   ©r¥   r   r   r   Î  s
   ÿýz-check_rel_lookup_compatibility.<locals>.checkr¦   F)r+   r¥   r£   )r¥   Útarget_optsr[   r   r   rê   r   Úcheck_rel_lookup_compatibilityÆ  s   ÿrì   c                   @   sH   e Zd ZdZeƒ dœdd„Zdd„ Zdd„ Zd	d
„ Zdd„ Z	dd„ Z
dS )ÚFilteredRelationz7Specify custom filtering in the ON clause of SQL joins.©Ú	conditionc                C   s:   |st dƒ‚|| _d | _t|tƒst dƒ‚|| _d | _d S )Nzrelation_name cannot be empty.z*condition argument must be a Q() instance.)Ú
ValueErrorÚrelation_nameÚaliasr.   r   rï   Úresolved_condition)r%   rñ   rï   r   r   r   r"   æ  s   

zFilteredRelation.__init__c                 C   s4   t || jƒstS | j|jko| j|jko| j|jkS r   )r.   r)   rˆ   rñ   rò   rï   r6   r   r   r   r‰   ó  s   
ÿ
ýzFilteredRelation.__eq__c                 C   s4   t | j| jd�}| j|_| j }d ur| ¡ |_|S )Nrî   )rí   rñ   rï   rò   ró   rT   )r%   rT   ró   r   r   r   rT   ü  s
   
zFilteredRelation.clonec                 C   s"   |   ¡ }|j }r| |¡|_|S r   )rT   ró   Úrelabeled_clone)r%   Ú
change_maprT   ró   r   r   r   rô     s   
z FilteredRelation.relabeled_clonec                 O   s(   |   ¡ }|j| j|dddd�d |_|S )NTF)Ú	can_reuser=   r>   Úupdate_join_typesr   )rT   Úbuild_filterrï   ró   )r%   rC   rD   r&   r'   rT   r   r   r   rH   	  s   ûúz#FilteredRelation.resolve_expressionc                 C   s   |  | j¡S r   )Úcompileró   )r%   r|   r{   r   r   r   Úas_sql  s   zFilteredRelation.as_sqlN)r�   r€   r’   r“   r   r"   r‰   rT   rô   rH   rú   r   r   r   r   rí   ã  s    	rí   )%r“   r¬   r·   ÚloggingÚcollectionsr   Ú
contextlibr   Údjango.core.exceptionsr   Ú	django.dbr   r   r   r   r	   Údjango.db.models.constantsr
   Údjango.utilsr   Údjango.utils.functionalr   Údjango.utils.hashabler   Ú	getLoggerrv   r   r   ÚNoder   r•   r©   r¯   rß   rç   rì   rí   r   r   r   r   Ú<module>   s6    
þ I-g&