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Various suggestions around migrations. Disabled by default! Enable with
pylint --load-plugins=pylint_django.checkers.migrations
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NewDbFieldWithDefaultCheckera
Looks for migrations which add new model fields and these fields have a
default value. According to Django docs this may have performance penalties
especially on large tables:
https://docs.djangoproject.com/en/2.0/topics/migrations/#postgresql
The preferred way is to add a new DB column with null=True because it will
be created instantly and then possibly populate the table with the
desired default values.
new-db-field-with-defaultW98)z %s AddField with default valuer zKUsed when Pylint detects migrations adding new fields with a default value.c \ t | r | j | d S d S N)r _migration_modulesappend)selfnodes r visit_modulez)NewDbFieldWithDefaultChecker.visit_moduleE s9 % % 1 # * *4 0 0 0 0 0 1 1r c | j }n# Y d S xY wt | sd S t | rD|| j vr
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visit_callz'NewDbFieldWithDefaultChecker.visit_callI s ZZ\\(FF FF#F++ F $T * * =T 44424'/426:::'/66t<<<<< = = ;: !c p d }| j |d d}g }| j D ]E}|j d d d }||k r|}| | F| j D ]+\ }}||v r"|D ] }| d|j | ,d S ) Nc | j S r# )pathr' s r _pathz1NewDbFieldWithDefaultChecker.close.._path[ s
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d d Z dS ) MissingBackwardsMigrationChecker$missing-backwards-migration-callabler 97)z+Always include backwards migration callablerO zbAlways include a backwards/reverse callable counterpart so that the migration is not irreversable.c | j }n# Y d S xY wt | sd S |j d rit
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d| d S d S d S )N RunPython reverse_coderO r3 ) r* r+ r r as_stringendswithlenr9 r r r= )r& r' r- r s r r. z+MissingBackwardsMigrationChecker.visit_call s ZZ\\(FF FF#F++ F 9 ) )+ 6 6 T3ty>>A;M;M}
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RunPython() migrations receive forward/backwards functions with signature:
def func(apps, schema_editor):
which could be unused. This augmentation will suppress all 'unused-argument'
messages coming from functions in migration modules.
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