3 g?@s~ddlZddlZddlmZmZddlmZddlmZddl m Z ddl m Z ddl mZmZmZmZd ZGd d d ZdS) N) import_modulereload)apps)settings)MigrationGraph)MigrationRecorder)AmbiguityErrorBadMigrationErrorInconsistentMigrationHistoryNodeNotFoundErrorZ migrationsc@seZdZdZdddZeddZdd Zd d Zd d Z ddZ ddZ ddZ ddZ ddZddZd ddZddZdS)!MigrationLoaderal Load migration files from disk and their status from the database. Migration files are expected to live in the "migrations" directory of an app. Their names are entirely unimportant from a code perspective, but will probably follow the 1234_name.py convention. On initialization, this class will scan those directories, and open and read the Python files, looking for a class called Migration, which should inherit from django.db.migrations.Migration. See django.db.migrations.migration for what that looks like. Some migrations will be marked as "replacing" another set of migrations. These are loaded into a separate set of migrations away from the main ones. If all the migrations they replace are either unapplied or missing from disk, then they are injected into the main set, replacing the named migrations. Any dependency pointers to the replaced migrations are re-pointed to the new migration. This does mean that this class MUST also talk to the database as well as to disk, but this is probably fine. We're already not just operating in memory. TFcCs.||_d|_d|_||_||_|r*|jdS)N) connectiondisk_migrationsapplied_migrationsignore_no_migrationsreplace_migrations build_graph)selfrloadrrrY/var/www/tester-filtro-web/env/lib/python3.6/site-packages/django/db/migrations/loader.py__init__+szMigrationLoader.__init__cCs8|tjkrtj|dfStj|j}d|tfdfSdS)z Return the path to the migrations module for the specified app_label and a boolean indicating if the module is specified in settings.MIGRATION_MODULE. Tz%s.%sFN)rZMIGRATION_MODULESrZget_app_confignameMIGRATIONS_MODULE_NAME)cls app_labelZapp_package_namerrrmigrations_module7s  z!MigrationLoader.migrations_modulec "Csi|_t|_t|_xtjD]}|j|j\}}|dkrP|jj|jq"|t j k}y t |}WnTt k r}z8|r|j s| rt|jjdkr|jj|jw"WYdd}~XnZXt|ds|jj|jq"t|dddkot|jt r|jj|jq"|rt||jj|jddtj|jD}x|D]}d||f} y t | } WnDtk r}z&dt|krtd | |nWYdd}~XnXt| d std ||jf| j||j|j|j|f<q>Wq"WdS) z6Load the migrations from all INSTALLED_APPS from disk.N.__path____file__cSs(h|] \}}}| r|ddkr|qS)rz_~r).0_rZis_pkgrrr lsz,MigrationLoader.load_disk..z%s.%szbad magic numberz9Couldn't import %r as it appears to be a stale .pyc file. Migrationz-Migration %s in app %s has no Migration class)rsetunmigrated_apps migrated_appsrZget_app_configsrlabeladdsysmodulesrModuleNotFoundErrorrrrsplithasattrgetattr isinstancerlistrpkgutil iter_modules ImportErrorstrr r$) rZ app_config module_nameexplicitZ was_loadedmoduleeZmigration_namesmigration_nameZmigration_pathZmigration_modulerrr load_diskDs\        zMigrationLoader.load_diskcCs|jj||fS)z6Return the named migration or raise NodeNotFoundError.)graphnodes)rr name_prefixrrr get_migrationszMigrationLoader.get_migrationcCs~g}x2|jD](\}}||kr |j|r |j||fq Wt|dkrVtd||fn$|sltd||fn|j|dSdS)zZ Return the migration(s) which match the given app label and name_prefix. rz>There is more than one migration for '%s' with the prefix '%s'z1There no migrations for '%s' with the prefix '%s'rN)r startswithappendlenr KeyError)rrr>resultsZmigration_app_labelr:rrrget_migration_by_prefixs z'MigrationLoader.get_migration_by_prefixc Cs|ddkr|ddks"||jkr&|S|d|kr6dS|d|jkrHdS|d|jkry8|ddkrx|jj|ddS|jj|ddSWn.tk r|jrdStd|dYnXtd|ddS)Nr __first__Z __latest__rz(Dependency on app with no migrations: %szDependency on unknown app: %s)r<r&r'Z root_nodes leaf_nodes IndexErrorr ValueError)rkeyZ current_apprrr check_keys "  zMigrationLoader.check_keycCsDx>|jD]4}|d|dkr|ddkr|jj|||ddqWdS)z Internal dependencies need to be added first to ensure `__first__` dependencies find the correct root node. rrrFT)skip_validationN) dependenciesr<add_dependency)rrJ migrationparentrrradd_internal_dependenciess z)MigrationLoader.add_internal_dependenciescCsxL|jD]B}|d|dkrq|j||d}|dk r|jj|||ddqWx:|jD]0}|j||d}|dk rV|jj|||ddqVWdS)NrT)rL)rMrKr<rNZ run_before)rrJrOrPchildrrradd_external_dependenciess  z)MigrationLoader.add_external_dependenciesc sDjjdkri_ntj}|j_t_i_x4jjD]&\}}jj |||j rH|j|<qHWx"jjD]\}}j ||q~Wx"jjD]\}}j ||qWj rHxjjD]v\}}fdd|j D}t|r|j|<njj|dt|s"t| r4jj||j qΈjj||j qWyjjWntk r4}zi}x>jjD]0\}}x$|j D]}|j|tj|qWqzW|j|kr"|j|jt}tfdd|D} | s"djdd|D} tdj|j|jd |jd | |j|WYdd}~XnXjjdS) z Build a migration dependency graph using both the disk and database. You'll need to rebuild the graph if you apply migrations. This isn't usually a problem as generally migration stuff runs in a one-shot process. Ncsg|]}|jkqSr)r)r!target)rrr sz/MigrationLoader.build_graph..c3s|]}|jjkVqdS)N)r<r=)r! candidate)rrr sz.MigrationLoader.build_graph..z, css|]}d|VqdS)z%s.%sNr)r!crrrrWszMigration {0} depends on nonexistent node ('{1}', '{2}'). Django tried to replace migration {1}.{2} with any of [{3}] but wasn't able to because some of the replaced migrations are already applied.rr)r;rrrrr< replacementsritemsadd_nodereplacesrQrSrallpopanyZremove_replaced_nodesZremove_replacement_nodeZvalidate_consistencyr setdefaultr%r)nodegetjoinformatoriginZensure_not_cyclic) rrecorderrJrOZapplied_statusesexcZreverse_replacementsZreplaced candidatesZ is_replacedtriesr)rrrsV       zMigrationLoader.build_graphc st|}|jxD]}||jjkr(qxp|jj|jD]^}|kr8||jkrntfdd|j|jDrnq8t dj |d|d|d|d|j q8WqWdS)zs Raise InconsistentMigrationHistory if any applied migrations have unapplied dependencies. c3s|]}|kVqdS)Nr)r!m)appliedrrrW0sz;MigrationLoader.check_consistent_history..zHMigration {}.{} is applied before its dependency {}.{} on database '{}'.rrN) rrr<r=Znode_mapparentsrYr]r\r rdalias)rrrfrOrPr)rkrcheck_consistent_history s   z(MigrationLoader.check_consistent_historycsZit}x<|jjD].\}}|kr0|j|j|tj|qWfdd|DS)z Look through the loaded graph and detect any conflicts - apps with more than one leaf migration. Return a dict of the app labels that conflict with the migration names that conflict. csi|]}t||qSr)sorted)r!r) seen_appsrr Fsz4MigrationLoader.detect_conflicts..)r%r<rGr)r`)rZconflicting_appsrr:r)rprdetect_conflicts:s z MigrationLoader.detect_conflictsNcCs|jj||t|jdS)z Return a ProjectState object representing the most recent state that the loaded migrations represent. See graph.make_state() for the meaning of "nodes" and "at_end". )r=at_endZ real_apps)r<Z make_stater1r&)rr=rsrrr project_stateHszMigrationLoader.project_statec Csg}d}x~|D]v\}}|jjd|jdJ}|dkrH|j|j|jfdd}|s^|j||dd}n|j||dd}WdQRX|j|j qW|S)z Take a migration plan and return a list of collected SQL statements that represent the best-efforts version of that plan. NT) collect_sqlatomicF)rs)ru) r schema_editorrvrtrrapplyZunapplyextendZ collected_sql)rZplanZ statementsstaterOZ backwardsrwrrrruQszMigrationLoader.collect_sql)TFT)NT)__name__ __module__ __qualname____doc__r classmethodrr;r?rErKrQrSrrnrrrtrurrrrr s B  Q r )r2r* importlibrrZ django.appsrZ django.confrZdjango.db.migrations.graphrZdjango.db.migrations.recorderr exceptionsr r r r rr rrrrs