B
    CVvg¼  ã               @   sb   d dl mZ d dlmZmZ d dlmZmZmZ d dl	m
Z
 d dlmZ dgZG dd„ de
ƒZdS )	é    )ÚNotSupportedError)Ú	StatementÚTable)Ú
DeferrableÚFÚQ)ÚBaseConstraint)ÚQueryÚExclusionConstraintc                   s~   e Zd ZdZddd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„ Z
‡ fdd„Z‡ fdd„Zdd„ Z‡  ZS )r
   zdCONSTRAINT %(name)s EXCLUDE USING %(index_type)s (%(expressions)s)%(include)s%(where)s%(deferrable)sN© )Ú
index_typeÚ	conditionÚ
deferrableÚincludeÚ	opclassesc               s4  |r|  ¡ dkrtdƒ‚|s$tdƒ‚tdd„ |D ƒƒs>tdƒ‚t|td ƒtfƒsXtdƒ‚|rh|rhtdƒ‚t|td ƒtfƒs‚td	ƒ‚t|td ƒttfƒsžtd
ƒ‚|rº|rº|  ¡ dkrºtdƒ‚t|ttfƒsÐtdƒ‚|rìt	|ƒt	|ƒkrìtdƒ‚|| _
|pød| _|| _|| _|�rt|ƒnd| _|| _tƒ j|d� d S )N>   ÚgistÚspgistz;Exclusion constraints only support GiST or SP-GiST indexes.zFAt least one expression is required to define an exclusion constraint.c             s   s(   | ] }t |ttfƒot|ƒd kV  qdS )é   N)Ú
isinstanceÚlistÚtupleÚlen)Ú.0Úexprr   r   úG/tmp/pip-install-o3oxmrkh/Django/django/contrib/postgres/constraints.pyú	<genexpr>   s   z/ExclusionConstraint.__init__.<locals>.<genexpr>z+The expressions must be a list of 2-tuples.z3ExclusionConstraint.condition must be a Q instance.z7ExclusionConstraint with conditions cannot be deferred.z=ExclusionConstraint.deferrable must be a Deferrable instance.z4ExclusionConstraint.include must be a list or tuple.r   z9Covering exclusion constraints only support GiST indexes.z6ExclusionConstraint.opclasses must be a list or tuple.zhExclusionConstraint.expressions and ExclusionConstraint.opclasses must have the same number of elements.ZGISTr   )Úname)ÚlowerÚ
ValueErrorÚallr   Útyper   r   r   r   r   Úexpressionsr   r   r   r   r   ÚsuperÚ__init__)Úselfr   r!   r   r   r   r   r   )Ú	__class__r   r   r#      sL    

zExclusionConstraint.__init__c          	      s°   g }x¦t | jƒD ]˜\}\}}t|tƒr.t|ƒ}|j|d�}| |¡\}}	y| j| }
|
rdd||
f }W n tk
rz   Y nX |t	‡ fdd„|	D ƒƒ }| 
d||f ¡ qW |S )N)Úqueryz%s %sc             3   s   | ]}ˆ   |¡V  qd S )N)Úquote_value)r   Úp)Úschema_editorr   r   r   R   s    z:ExclusionConstraint._get_expression_sql.<locals>.<genexpr>z
%s WITH %s)Ú	enumerater!   r   Ústrr   Zresolve_expressionÚcompiler   Ú
IndexErrorr   Úappend)r$   Úcompilerr)   r&   r!   ÚidxZ
expressionÚoperatorÚsqlÚparamsZopclassr   )r)   r   Ú_get_expression_sqlE   s    

z'ExclusionConstraint._get_expression_sqlc                sF   | j d krd S | | j ¡}| |ˆ j¡\}}|t‡ fdd„|D ƒƒ S )Nc             3   s   | ]}ˆ   |¡V  qd S )N)r'   )r   r(   )r)   r   r   r   [   s    z9ExclusionConstraint._get_condition_sql.<locals>.<genexpr>)r   Zbuild_whereZas_sqlÚ
connectionr   )r$   r/   r)   r&   Úwherer2   r3   r   )r)   r   Ú_get_condition_sqlV   s
    
z&ExclusionConstraint._get_condition_sqlc          	      sŽ   t ˆ dd�}|j|jd�}|  |||¡}|  |||¡}‡ fdd„| jD ƒ}| j| | j¡| j	d 
|¡| ˆ |¡|rzd| nd| | j¡d	œ S )
NF)Z
alias_cols)r5   c                s   g | ]}ˆ j  |¡j‘qS r   )Ú_metaÚ	get_fieldÚcolumn)r   Ú
field_name)Úmodelr   r   ú
<listcomp>b   s    z6ExclusionConstraint.constraint_sql.<locals>.<listcomp>z, z WHERE (%s)Ú )r   r   r!   r   r6   r   )r	   Zget_compilerr5   r4   r7   r   ÚtemplateÚ
quote_namer   r   ÚjoinZ_index_include_sqlZ_deferrable_constraint_sqlr   )r$   r<   r)   r&   r/   r!   r   r   r   )r<   r   Úconstraint_sql]   s    

z"ExclusionConstraint.constraint_sqlc             C   s,   |   |¡ tdt|jj|jƒ|  ||¡d�S )Nz(ALTER TABLE %(table)s ADD %(constraint)s)ÚtableÚ
constraint)Úcheck_supportedr   r   r8   Zdb_tabler@   rB   )r$   r<   r)   r   r   r   Ú
create_sqll   s
    
zExclusionConstraint.create_sqlc             C   s   |  |j|| | j¡¡S )N)Z_delete_constraint_sqlZsql_delete_checkr@   r   )r$   r<   r)   r   r   r   Ú
remove_sqlt   s    zExclusionConstraint.remove_sqlc             C   s   | j r|jjjstdƒ‚d S )Nz7Covering exclusion constraints requires PostgreSQL 12+.)r   r5   ÚfeaturesZsupports_covering_gist_indexesr   )r$   r)   r   r   r   rE   {   s    z#ExclusionConstraint.check_supportedc                s€   t ƒ  ¡ \}}}| j|d< | jd k	r.| j|d< | j ¡ dkrF| j|d< | jrV| j|d< | jrf| j|d< | jrv| j|d< |||fS )Nr!   r   r   r   r   r   r   )	r"   Údeconstructr!   r   r   r   r   r   r   )r$   ÚpathÚargsÚkwargs)r%   r   r   rI   �   s    






zExclusionConstraint.deconstructc                sl   t || jƒr`| j|jko^| j|jko^| j|jko^| j|jko^| j|jko^| j|jko^| j|jkS t	ƒ  
|¡S )N)r   r%   r   r   r!   r   r   r   r   r"   Ú__eq__)r$   Úother)r%   r   r   rM   �   s    zExclusionConstraint.__eq__c          
   C   sn   d| j j| j| j| jd krdnd| j | jd kr4dnd| j | jsFdndt| jƒ | js\dndt| jƒ f S )Nz+<%s: index_type=%s, expressions=%s%s%s%s%s>r>   z, condition=%sz, deferrable=%sz, include=%sz, opclasses=%s)	r%   Ú__qualname__r   r!   r   r   r   Úreprr   )r$   r   r   r   Ú__repr__�   s    zExclusionConstraint.__repr__)Ú__name__Ú
__module__rO   r?   r#   r4   r7   rB   rF   rG   rE   rI   rM   rQ   Ú__classcell__r   r   )r%   r   r
   
   s   6N)Z	django.dbr   Z!django.db.backends.ddl_referencesr   r   Zdjango.db.modelsr   r   r   Zdjango.db.models.constraintsr   Zdjango.db.models.sqlr	   Ú__all__r
   r   r   r   r   Ú<module>   s   