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Deal with storing migration records in the database.
Because this table is actually itself used for dealing with model
creation, it's the one thing we can't do normally via migrations.
We manually handle table creation/schema updating (using schema backend)
and then have a floating model to do queries with.
If a migration is unapplied its row is removed from the table. Having
a row in the table always means a migration is applied.
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zMigrationRecorder.__init__c C s | j j�| jj�S r$ )r �objects�usingr% �aliasr r r r � migration_qs1 � z MigrationRecorder.migration_qsc C sF | j �� �}| j j�|�}W d � n1 sw Y | jjj|v S )z2Return True if the django_migrations table exists.N)r% �cursor�
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C sr | � � rdS z | j�� �}|�| j� W d � W dS 1 s w Y W dS ty8 } ztd| ��d}~ww )z3Ensure the table exists and has the correct schema.Nz1Unable to create the django_migrations table (%s))r1 r% �
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Return a dict mapping (app_name, migration_name) to Migration instances
for all applied migrations.
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<dictcomp>N s z8MigrationRecorder.applied_migrations.<locals>.<dictcomp>)r1 r* r r r r �applied_migrationsH s z$MigrationRecorder.applied_migrationsc C s | � � | jj||d� dS )z$Record that a migration was applied.r7 N)r6 r* �create�r r r r r r �record_appliedT s z MigrationRecorder.record_appliedc C s | � � | jj||d��� dS )z&Record that a migration was unapplied.r7 N)r6 r* �filter�deleter= r r r �record_unappliedY s z"MigrationRecorder.record_unappliedc C s | j �� �� dS )z<Delete all migration records. Useful for testing migrations.N)r* �allr@ r r r r �flush^ r+ zMigrationRecorder.flush)r r r �__doc__r! r r r& �propertyr* r1 r6 r; r> rA rC r r r r r s
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