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Adds a lookup on ``cls`` when a related field is defined using a string,
i.e.::
class MyModel(Model):
fk = ForeignKey("AnotherModel")
This string can be:
* RECURSIVE_RELATIONSHIP_CONSTANT (i.e. "self") to indicate a recursive
relation.
* The name of a model (i.e "AnotherModel") to indicate another model in
the same app.
* An app-label and model name (i.e. "someapp.AnotherModel") to indicate
another model in a different app.
If the other model hasn't yet been loaded -- almost a given if you're using
lazy relationships -- then the relation won't be set up until the
class_prepared signal fires at the end of model initialization.
operation is the work that must be performed once the relation can be resolved.
t .t
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Handle any pending relations to the sending model. Sent from class_prepared.
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| _ | | _ | | _ d S( Ns: 'to' must be either a model, a model name or the string %r( R Rx R! R R" t AssertionErrorR R+ R> RE RQ R8 t limit_choices_toRo R� t parent_linkt on_delete( R R+ R> RE R� R� R� RQ ( ( sA /tmp/pip-install-XxeQeY/django/django/db/models/fields/related.pyR] M s
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| j j � S( N( R+ t get_reverse_joining_columns( R ( ( sA /tmp/pip-install-XxeQeY/django/django/db/models/fields/related.pyt get_joining_columnsa s c C s | j j | | | � S( N( R+ t get_extra_restriction( R t where_classt aliast
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Sets 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()
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Returns the Field in the 'to' object to which this relationship is
tied.
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ManyToManyRelc B s5 e Z d d e d e d d � Z d � Z d � Z RS( c C s} | r | r t d � � n | | _ | | _ | | _ | d k rL i } n | | _ | | _ t | _ | | _ | | _
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Returns the field in the to' object to which this relationship is tied
(this is always the primary key on the target model). Provided for
symmetry with ManyToOneRel.
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� S( N( R� Ry ( R R R ( ( sA /tmp/pip-install-XxeQeY/django/django/db/models/fields/related.pyR� � s c C s | j | | j � S( N( t get_instance_value_for_fieldsR� ( R R^ ( ( sA /tmp/pip-install-XxeQeY/django/django/db/models/fields/related.pyR� � s c C s | j | | j � S( N( R R� ( R R^ ( ( sA /tmp/pip-install-XxeQeY/django/django/db/models/fields/related.pyR� � s c C sV g } xC | D]; } | j r/ | j | j � q
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c C s% t t | � j � \ } } | d f S( N( RA R t get_attname_columnR8 ( R Rk R� ( ( sA /tmp/pip-install-XxeQeY/django/django/db/models/fields/related.pyR � s c C sG | r | j n | j } t g | D] \ } } | j | j f ^ q" � S( N( R Ry R� R� ( R t reverse_joint sourceR R ( ( sA /tmp/pip-install-XxeQeY/django/django/db/models/fields/related.pyR � s c C s | j d t � S( NR ( R Ro ( R ( ( sA /tmp/pip-install-XxeQeY/django/django/db/models/fields/related.pyR � s c C s i S( s�
Returns an extra filter condition for related object fetching when
user does 'instance.fieldname', that is the extra filter is used in
the descriptor of the field.
The filter should be either a dict usable in .filter(**kwargs) call or
a Q-object. The condition will be ANDed together with the relation's
joining columns.
A parallel method is get_extra_restriction() which is used in
JOIN and subquery conditions.
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Returns a pair condition used for joining and subquery pushdown. The
condition is something that responds to as_sql(qn, connection) method.
Note that currently referring both the 'alias' and 'related_alias'
will not work in some conditions, like subquery pushdown.
A parallel method is get_extra_descriptor_filter() which is used in
instance.fieldname related object fetching.
N( R8 ( R R R R ( ( sA /tmp/pip-install-XxeQeY/django/django/db/models/fields/related.pyR s c C s: | j j j } | j j } t | | | j | t t � g S( s@
Get path from this field to the related model.
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get_path_info s c C sJ | j j } | j j j } t | | | j f | j | j t � g } | S( sH
Get path from the related model to this field's model.
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| j j � qg n d S( N( R= R� R/ R t swappedRn R} R� R� t related_fkey_lookupsR) ( R R* RO ( ( sA /tmp/pip-install-XxeQeY/django/django/db/models/fields/related.pyRP q s ( R RR Ro t requires_unique_targett generate_reverse_relationR] R R� Ry R R� R� R� R� t staticmethodR R R& R R R� R R! R$ R> R? RA R: RP ( ( ( sA /tmp/pip-install-XxeQeY/django/django/db/models/fields/related.pyR � s.
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g | g | � d S( Nsg %s(%r) is invalid. First parameter to ForeignKey must be either a model, a model name, or the string %rs2 %s cannot define a relation with abstract class %st db_indexRE RQ R� R� R� R= R ( R R% RF Rx R! R R" R� R| R R RD RG RH Ro R R3 R8 R& R RA RG R] ( R R> R t rel_classR R5 t to_name( ( sA /tmp/pip-install-XxeQeY/django/django/db/models/fields/related.pyR] � s"
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c C s | j d S( Ni ( R� ( R ( ( sA /tmp/pip-install-XxeQeY/django/django/db/models/fields/related.pyR� � s c C sJ | j j } | j j j } t | | | j f | j | j t � g } | S( sH
Get path from the related model to this field's model.
( R/ R R= R> R RG R" R& ( R RB R R# ( ( sA /tmp/pip-install-XxeQeY/django/django/db/models/fields/related.pyR$ � s +c C s� | j j r d St t | � j | | � | d k r9 d St j | j d | �} | j j j
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6� } | j | j j � } | j � s� t j | j d d d d i | j j j j d 6| d 6�� n d S( NR^ RH t codeR� R/ RG ( R= R� RA RG t validateR8 R R` R| R> R� Rb Rm R� t complex_filterR� t existsR t ValidationErrort error_messagesR RL ( R R1 t model_instanceRb Rt ( ( sA /tmp/pip-install-XxeQeY/django/django/db/models/fields/related.pyRM � s
c C s d | j S( Ns %s_id( RH ( R ( ( sA /tmp/pip-install-XxeQeY/django/django/db/models/fields/related.pyR� � s c C s% | j � } | j p | } | | f S( N( R� t db_column( R Rk R� ( ( sA /tmp/pip-install-XxeQeY/django/django/db/models/fields/related.pyR � s c C s d | j | j j f S( Ns
%s__%s__exact( RH R� ( R ( ( sA /tmp/pip-install-XxeQeY/django/django/db/models/fields/related.pyt get_validator_unique_lookup_type� s c C sA t t | � j � } t | | j j � r= t | | j j � S| S( sN Here we check if the default value is an object and return the to_field if so.( RA RG R@ R! R= R> Rw R� Rk ( R t
field_default( ( sA /tmp/pip-install-XxeQeY/django/django/db/models/fields/related.pyR@ � s c C s6 | d k s | d k r d S| j j | d | �Sd S( NR� R ( R8 R� t get_db_prep_save( R R1 R ( ( sA /tmp/pip-install-XxeQeY/django/django/db/models/fields/related.pyRV � s c C se | sO | j rO | j rO | j � } t | � d k rL t | d d � SqO n t t | � j | � S( Ni i i ( t blankt choicest get_choices_defaultR� R RA RG t value_to_string( R Rf t choice_list( ( sA /tmp/pip-install-XxeQeY/django/django/db/models/fields/related.pyRZ � s c C sG t t | � j | | � | j j d k rC | j j j | j _ n d S( N( RA RG RP R= R� R8 R RG RH ( R R* RO ( ( sA /tmp/pip-install-XxeQeY/django/django/db/models/fields/related.pyRP � s c K s� | j d d � } t | j j t j � rL t d | j | j j f � � n i t j
d 6| j j j j | � j
| j j � d 6| j j d 6} | j | � t t | � j | � S( NRb sY Cannot create form field for %r yet, because its related model %r has not been loaded yett
form_classt querysetR ( R3 R8 R! R= R> R R" R$ RH R t ModelChoiceFieldR� Rb RN R� R� R� RA RG t formfield( R R5 Rd t defaults( ( sA /tmp/pip-install-XxeQeY/django/django/db/models/fields/related.pyR_ � s
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c C s] | j } t | t � s: | j j rM t | t t f � rM t � j d | � S| j d | � S( NR ( R� R! R R� t related_fields_match_typeR
R R R9 ( R R R� ( ( sA /tmp/pip-install-XxeQeY/django/django/db/models/fields/related.pyR9 � s
N( R RR R& t empty_strings_allowedRK t default_error_messagest descriptionR8 R Ro R] R� R� R$ RM R� R RT R@ RV RZ RP R_ R9 ( ( ( sA /tmp/pip-install-XxeQeY/django/django/db/models/fields/related.pyRG z s$ t
OneToOneFieldc B sA e Z d Z e d � Z d d � Z d � Z d � Z d � Z RS( s
A OneToOneField is essentially the same as a ForeignKey, with the exception
that always carries a "unique" constraint with it and the reverse relation
always returns the object pointed to (since there will only ever be one),
rather than returning a list.
s One-to-one relationshipc K s- t | d <t t | � j | | t | � d S( NR" ( Ro RA Re R] R ( R R> R R5 ( ( sA /tmp/pip-install-XxeQeY/django/django/db/models/fields/related.pyR] s
c C s t | | j � t | � � d S( N( Rn R} RZ ( R R* RO ( ( sA /tmp/pip-install-XxeQeY/django/django/db/models/fields/related.pyRP s c K s& | j j r d St t | � j | � S( N( R= R� R8 RA Re R_ ( R R5 ( ( sA /tmp/pip-install-XxeQeY/django/django/db/models/fields/related.pyR_ s c C sB t | | j j � r+ t | | j | � n t | | j | � d S( N( R! R= R> Rn RH Rk ( R R^ R ( ( sA /tmp/pip-install-XxeQeY/django/django/db/models/fields/related.pyt save_form_data s N(
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C s d d l m } t } t | j j t j � r~ | j j t k r~ | j j } | j d � d } d � } t
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6| d 6| j j d 6| j j d
6| | f d 6d i | d 6| d 6d 6d i | d 6| d 6d 6� } t t | � | j f i | d 6| j d 6| j | d d | d
| j d | j j �| 6| j | d d | d
| j d | j j �| 6� S( Ni����( t modelsR c S s( | j j p | j j | j j j _ d S( N( R t managedR= R� ( R+ R/ R* ( ( sA /tmp/pip-install-XxeQeY/django/django/db/models/fields/related.pyt set_managed) s s %s_%ss from_%ss to_%st MetaR� Ri R� R t
db_tablespacet unique_togethers %(from)s-%(to)s relationshipt fromR> RL s %(from)s-%(to)s relationshipst verbose_name_pluralRR RE s %s+R ( t django.dbRh Ro R! R= R> R R" R R# R2 R R% Ri RH RF R. t typet objectt _get_m2m_db_tableR Rl t strR� RR RG R (
R+ t klassRh Ri t to_modelR> Rj RH t from_t meta( ( sA /tmp/pip-install-XxeQeY/django/django/db/models/fields/related.pyt& create_many_to_many_intermediary_model" sD * $
/t ManyToManyFieldc B s� e Z e d � Z e d � Z e d � Z d � Z d � Z d � Z
d � Z d � Z d � Z
d � Z d
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� Z d � Z d � Z RS( s Many-to-many relationshipc K sp y3 | j j s2 t d | j j | j j f � � WnN t k
r� t | t j � st t d | j j | t
f � � t | � } n X| j d d � | d <t | d | j d d � d | j d d � d | j d d � d | j d | t
k � d | j d d � d | �| d
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j d k rV| j d k sVt d � � n t t | � j | � d S(
Ns2 %s cannot define a relation with abstract class %ssl %s(%r) is invalid. First parameter to ManyToManyField must be either a model, a model name, or the string %rRL RE RQ R� R� R� R R= R� s; Cannot specify a db_table if an intermediary model is used.( R RD R� R| R R% Rx R! R R" R Rt Rz R8 R
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c C s� g } | j j } | j j | j � � d } | j j | j � � d } | rk | j � } | j � } n | j � } | j � } | j | � | j | � | S( sC
Called by both direct and indirect m2m traversal.
i ( R= R� R R R� R� R$ R! t extend( R t directR# t int_modelt
linkfield1t
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join1infost
join2infos( ( sA /tmp/pip-install-XxeQeY/django/django/db/models/fields/related.pyt _get_path_infok s
c C s | j d t � S( NR| ( R� Ro ( R ( ( sA /tmp/pip-install-XxeQeY/django/django/db/models/fields/related.pyR! } s c C s | j d t � S( NR| ( R� R& ( R ( ( sA /tmp/pip-install-XxeQeY/django/django/db/models/fields/related.pyR$ � s c C s t j | d t �S( Nt
include_blank( R t get_choicesR& ( R ( ( sA /tmp/pip-install-XxeQeY/django/django/db/models/fields/related.pyRY � s c C s_ | j j d k r" | j j j j S| j r2 | j St j d | j | j f t j j
� � Sd S( sL Function that can be curried to provide the m2m table name for this relations %s_%sN( R= R� R8 R R� R t
truncate_nameRH R R� t max_name_length( R RB ( ( sA /tmp/pip-install-XxeQeY/django/django/db/models/fields/related.pyRs � s c C s� d | } t | | � r& t | | � Sxm | j j j j D]Y } t | d � r9 | j r9 | j j | j k r9 t | | t | | � � t | | � Sq9 Wd S( s_ Function that can be curried to provide the source accessor or DB column name for the m2m tables
_m2m_%s_cacheR= N( RC Rw R= R� R R R> R/ Rn ( R RO t attrt
cache_attrR� ( ( sA /tmp/pip-install-XxeQeY/django/django/db/models/fields/related.pyt
_get_m2m_attr� s
-c C s� d | } t | | � r& t | | � St } x� | j j j j D]� } t | d � r? | j r? | j j | j k r? | j | j k r� | r� t
| | t | | � � Pq� t } q� t
| | t | | � � Pq? q? Wt | | � S( s` Function that can be curried to provide the related accessor or DB column name for the m2m tables _m2m_reverse_%s_cacheR= ( RC Rw R& R= R� R R R> t parent_modelR/ Rn Ro ( R RO R� R� t foundR� ( ( sA /tmp/pip-install-XxeQeY/django/django/db/models/fields/related.pyt _get_m2m_reverse_attr� s
- c C s� d } | rF t | | j � j � } g | D] } | j � ^ q+ } n> | j s� | j � } t | � d k r� | d d g } q� n t | � S( NR� i i ( Rw RH t allRe RW RY R� R ( R Rf R Rt R^ t choices_list( ( sA /tmp/pip-install-XxeQeY/django/django/db/models/fields/related.pyRZ � s " c C s | j j rI | j j d k s6 | j j | j j k rI d | | j _ n t t | � j | | � | j j r� | j j
r� | j j r� t | | � | j _ n t
| | j t | � � t | j | j � | _ t | j j t j � rd � } t | | | j j | � n d S( NR s %s_rel_+c S s | | j _ d S( N( R= R� ( R+ R/ R* ( ( sA /tmp/pip-install-XxeQeY/django/django/db/models/fields/related.pyt resolve_through_model� s ( R= R� R> R R% RE RA Rz R: R� RD RB Ry Rn RH R� R Rs t m2m_db_tableR! R R" R2 ( R R* RH R� ( ( sA /tmp/pip-install-XxeQeY/django/django/db/models/fields/related.pyR: � s 6' c s� | j j � r? | j j j r? t | | j � t | � � n t | j | d � | _
t | j | d � | _ t | j | d � | _
t | j | d � | _ t | j | d � � � f d � | _ t | j | d � � � f d � | _ d S( NR� RH R= c s
� � j S( N( R� ( ( t get_m2m_rel( sA /tmp/pip-install-XxeQeY/django/django/db/models/fields/related.pyRg � s c s
� � j S( N( R� ( ( t get_m2m_reverse_rel( sA /tmp/pip-install-XxeQeY/django/django/db/models/fields/related.pyRg � s ( R= R� R/ R RB Rn R} R� R R� t m2m_column_nameR� t m2m_reverse_nameR� R� t m2m_target_field_namet m2m_reverse_target_field_name( R R* RO ( ( R� R� sA /tmp/pip-install-XxeQeY/django/django/db/models/fields/related.pyRP � s c C s d S( N( ( R ( ( sA /tmp/pip-install-XxeQeY/django/django/db/models/fields/related.pyRN � s c C s t | | j � j � S( s< Returns the value of this field in the given model instance.( Rw Rk R� ( R Rf ( ( sA /tmp/pip-install-XxeQeY/django/django/db/models/fields/related.pyt value_from_object� s c C s t | | j | � d S( N( Rn Rk ( R R^ R ( ( sA /tmp/pip-install-XxeQeY/django/django/db/models/fields/related.pyRf � s c K s� | j d d � } i t j d 6| j j j j | � j | j j � d 6} | j
| � | j d � d k r� | d } t | � r� | � } n g | D] } | j
� ^ q� | d <n t t | � j | � S( NRb R\ R] t initial( R3 R8 R t ModelMultipleChoiceFieldR= R> R� Rb RN R� R� Rz t callableRe RA Rz R_ ( R R5 Rd R` R� t i( ( sA /tmp/pip-install-XxeQeY/django/django/db/models/fields/related.pyR_ � s
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N(B t operatorR Rp R R R t django.db.backendsR R� R R t django.db.models.fieldsR R R R
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