o
    ÕèFh«B  ã                   @   sü   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	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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
FieldError)ÚDEFAULT_DB_ALIASÚDatabaseErrorÚconnections)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   úU/var/www/html/loop/nvenv/lib/python3.10/site-packages/django/db/models/query_utils.pyr       s
   €ÿr   c                       s´   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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   3   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   )r1   r   ©r"   r.   r   r   r   Ú__or__G   ó   zQ.__or__c                 C   r2   r   )r1   r   r3   r   r   r   Ú__and__J   r5   z	Q.__and__c                 C   r2   r   )r1   r   r3   r   r   r   Ú__xor__M   r5   z	Q.__xor__c                 C   s   |   ¡ }| ¡  |S r   )r*   Únegate)r"   r0   r   r   r   Ú
__invert__P   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_expressionU   s   
ú
zQ.resolve_expressionc                 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.
        é   ÚflattenN)r   r+   ÚtupleÚhasattrrG   )r"   Úchildr   r   r   rG   e   s   €


ùz	Q.flattenc              
   C   s  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rT| t|| d|ƒ d�ƒ¡ n| | ¡ |j|d�}z| |¡duW 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SINGLENrE   F)ÚselectrF   Ú_checkT)Úoutput_field)Úusingz.Got a database error calling check() on %r: %s)Údjango.db.modelsrK   rL   Údjango.db.models.functionsrM   Údjango.db.models.sqlrN   Údjango.db.models.sql.constantsrO   r!   rI   Úadd_annotationr   ÚfeaturesÚsupports_comparing_boolean_exprÚadd_qr   Úget_compilerÚexecute_sqlr   ÚloggerÚwarning)r"   ÚagainstrS   rK   rL   rM   rN   rO   r@   ÚnameÚvalueÚcompilerÚer   r   r   Úcheckt   s*   

€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replacerH   r   r   Údefaultr   )r"   Úpathr#   r$   r   r   r   Údeconstruct‘   s   



zQ.deconstructc                 C   sb   |   ¡ \}}}|g| ¡ ¢}|D ]}t|tƒr'|\}}t|ƒ}| ||f¡ q| |¡ qt|ƒS r   )rl   r!   r+   rH   r
   Úappend)r"   rk   r#   r$   ÚidentityrJ   Úargrb   r   r   r   rn   �   s   
z
Q.identityc                 C   s   t |tƒstS |j| jkS r   )r+   r   ÚNotImplementedrn   r3   r   r   r   Ú__eq__ª   s   
zQ.__eq__c                 C   s
   t | jƒS r   )Úhashrn   )r"   r   r   r   Ú__hash__¯   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   )r@   c                 S   s   h | ]
}|  td ¡d ’qS )rF   r   )Úsplitr   )Ú.0rJ   r   r   r   Ú	<setcomp>»   s    ÿz+Q.referenced_base_fields.<locals>.<setcomp>)rV   r@   Úget_children_from_q)r"   r@   r   r   r   Úreferenced_base_fields²   s   ÿzQ.referenced_base_fields)NTNFF)rg   rf   Ú__qualname__Ú__doc__r   r   r   rj   r'   r   r1   r4   r6   r7   r9   rE   rG   r   re   rl   r	   rn   rq   rs   ry   Ú__classcell__r   r   r%   r   r   &   s0    
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   )Úfield)r"   r~   r   r   r   r   Æ   rt   zDeferredAttribute.__init__Nc                 C   st   |du r| S |j }| jj}||vr6|  |¡}|du r2|jdu r'| 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pkÚ	generatedÚAttributeErrorÚrefresh_from_db)r"   Úinstancer   ÚdataÚ
field_nameÚvalr   r   r   Ú__get__É   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"   r‡   ÚoptsÚ
link_fieldr   r   r   r‚   à   s
   z%DeferredAttribute._check_parent_chainr   )rg   rf   rz   r{   r   r‹   r‚   r   r   r   r   r}   À   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"   r“   r”   r   r   r   r   ó   s   
z!class_or_instance_method.__init__c                 C   s$   |d u rt  | j|¡S t  | j|¡S r   )Ú	functoolsÚpartialr“   r”   )r"   r‡   Úownerr   r   r   r‹   ÷   s   z class_or_instance_method.__get__N)rg   rf   rz   r{   r   r‹   r   r   r   r   r’   í   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_lookupþ   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€   rš   )rv   Úparentr   r   r   Ú
<listcomp>  s    ÿz9RegisterLookupMixin.get_class_lookups.<locals>.<listcomp>)ÚinspectÚgetmroÚmerge_dicts)r   r�   r   r   r   Úget_class_lookups  s   ÿ
z%RegisterLookupMixin.get_class_lookupsc                 C   s(   |   ¡ }t| dd ƒ }ri |¥|¥S |S ©NÚinstance_lookups)r£   r(   )r"   r�   r¥   r   r   r   Úget_instance_lookups  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LookuprR   )Údjango.db.models.lookupsr¨   rœ   rI   rR   Ú
get_lookupÚ
issubclass)r"   r›   r¨   Úfoundr   r   r   rª     ó   
zRegisterLookupMixin.get_lookupc                 C   r§   )Nr   )Ú	TransformrR   )r©   r®   rœ   rI   rR   Úget_transformr«   )r"   r›   r®   r¬   r   r   r   r¯     r­   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   r¢   %  s   zRegisterLookupMixin.merge_dictsc                 C   s   t | ƒD ]}|j ¡  qd S r   )r   r£   Úcache_clearr   r   r   r   Ú_clear_cached_class_lookups0  s   ÿz/RegisterLookupMixin._clear_cached_class_lookupsNc                 C   s4   |d u r|j }d| jvri | _|| j|< |  ¡  |S )Nr�   )r›   r€   r�   r¶   ©r   Úlookupr›   r   r   r   Úregister_class_lookup5  s   

z)RegisterLookupMixin.register_class_lookupc                 C   s,   |d u r|j }d| jvri | _|| j|< |S r¤   )r›   r€   r¥   ©r"   r¸   r›   r   r   r   Úregister_instance_lookup>  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)r›   r�   r¶   r·   r   r   r   Ú_unregister_class_lookupK  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)r›   r¥   rº   r   r   r   Ú_unregister_instance_lookupU  s   z/RegisterLookupMixin._unregister_instance_lookupr   )rg   rf   rz   rœ   r•   Úcacher£   r¦   r’   r™   Úclassmethodrª   r¯   Ústaticmethodr¢   r¶   r¹   r»   Úregister_lookupr¼   r½   Ú_unregister_lookupr   r   r   r   r˜   ý   s2    








	ÿ


	ÿr˜   Fc                 C   sŽ   | j sdS | j jr|sdS |r"|r|  ¡ |vrdS |s"| j|vr"dS |s)| jr)dS |rE|rE| j|v rE| |vrEtd| jjj› d| j› d�ƒ‚dS )af  
    Return True if this field should be used to descend deeper for
    select_related() purposes. Used by both the query construction code
    (compiler.get_related_selections()) and the model instance creation code
    (compiler.klass_info).

    Arguments:
     * field - the field to be checked
     * restricted - a boolean field, indicating if the field list has been
       manually restricted using a requested clause)
     * requested - The select_related() dictionary.
     * select_mask - the dictionary of selected fields.
     * reverse - boolean, True if we are checking a reverse select related
    FzField Ú.zM cannot be both deferred and traversed using select_related at the same time.T)	Úremote_fieldÚparent_linkÚrelated_query_namera   Únullr   rŽ   rŒ   Úobject_name)r~   Ú
restrictedÚ	requestedÚselect_maskÚreverser   r   r   Úselect_related_descendd  s*   
ÿþ
ÿrÍ   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.
    rF   r   N)Nr   )ÚrangeÚlenr   Újoinrš   )Úlookup_partsÚannotationsÚnÚlevel_n_lookupr   r   r   Úrefs_expression‹  s   
ÿrÕ   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  ¡ v pˆ |  ¡ v S r   )rŒ   Úconcrete_modelÚget_parent_list)r�   ©rŽ   r   r   re      s
   ÿ
ýz-check_rel_lookup_compatibility.<locals>.checkr�   F)r(   rŽ   rŒ   )rŽ   Útarget_optsr~   re   r   rØ   r   Úcheck_rel_lookup_compatibility˜  s   ÿrÚ   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   rÝ   Úresolved_condition)r"   rß   rÝ   r   r   r   r   ¸  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&   rp   rß   rà   rÝ   r3   r   r   r   rq   Å  s   
ÿ
ýzFilteredRelation.__eq__c                 C   s4   t | j| jd�}| j|_| j }d ur| ¡ |_|S )NrÜ   )rÛ   rß   rÝ   rà   rá   Úclone)r"   râ   rá   r   r   r   râ   Î  s
   
zFilteredRelation.clonec                 C   s"   |   ¡ }|j }r| |¡|_|S r   )râ   rá   Úrelabeled_clone)r"   Ú
change_maprâ   rá   r   r   r   rã   Õ  s   
z FilteredRelation.relabeled_clonec                 O   s(   |   ¡ }|j| j|dddd�d |_|S )NTF)Ú	can_reuser:   r;   Úupdate_join_typesr   )râ   Úbuild_filterrÝ   rá   )r"   r@   rA   r#   r$   râ   r   r   r   rE   Û  s   ûúz#FilteredRelation.resolve_expressionc                 C   s   |  | j¡S r   )Úcompilerá   )r"   rc   Ú
connectionr   r   r   Úas_sqlæ  s   zFilteredRelation.as_sqlN)rg   rf   rz   r{   r   r   rq   râ   rã   rE   rê   r   r   r   r   rÛ   µ  s    	rÛ   )F)!r{   r•   r    ÚloggingÚcollectionsr   Údjango.core.exceptionsr   Ú	django.dbr   r   r   Údjango.db.models.constantsr   Údjango.utilsr   Údjango.utils.functionalr	   Údjango.utils.hashabler
   Ú	getLoggerr^   r   r   ÚNoder   r}   r’   r˜   rÍ   rÕ   rÚ   rÛ   r   r   r   r   Ú<module>   s4    
þ -
g'