postgresql - `pg:pull` is not a heroku command, but `db:pull` is -

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i've been trying pull database heroku. reason when try

heroku pg:pull heroku_postgresql_rainbow_url newlocaldb --app myapp

it returns

! pg:pull not heroku command. ! perhaps meant

db:pull, pg:kill or pg:psql. ! see heroku help list of available commands.

on other hand, command 

heroku db:pull heroku_postgresql_rainbow_url newlocaldb --app myapp

is recognized, despite db:pull replaced pg:pull according e.g. this.

when try heroku help, shows entry db:pull not pg:pull.

so, nice use command pg:pull. doesn't work me now. (i believe did recently.) problem?


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