{"action":"opened","issue":{"url":"https://api.github.com/repos/srcshelton/myway/issues/21","repository_url":"https://api.github.com/repos/srcshelton/myway","labels_url":"https://api.github.com/repos/srcshelton/myway/issues/21/labels{/name}","comments_url":"https://api.github.com/repos/srcshelton/myway/issues/21/comments","events_url":"https://api.github.com/repos/srcshelton/myway/issues/21/events","html_url":"https://github.com/srcshelton/myway/issues/21","id":187102734,"number":21,"title":"Consider implementing Flyway 'Placeholder replacement'","user":{"login":"srcshelton","id":179397,"avatar_url":"https://avatars.githubusercontent.com/u/179397?v=3","gravatar_id":"","url":"https://api.github.com/users/srcshelton","html_url":"https://github.com/srcshelton","followers_url":"https://api.github.com/users/srcshelton/followers","following_url":"https://api.github.com/users/srcshelton/following{/other_user}","gists_url":"https://api.github.com/users/srcshelton/gists{/gist_id}","starred_url":"https://api.github.com/users/srcshelton/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/srcshelton/subscriptions","organizations_url":"https://api.github.com/users/srcshelton/orgs","repos_url":"https://api.github.com/users/srcshelton/repos","events_url":"https://api.github.com/users/srcshelton/events{/privacy}","received_events_url":"https://api.github.com/users/srcshelton/received_events","type":"User","site_admin":false},"labels":[{"id":181091958,"url":"https://api.github.com/repos/srcshelton/myway/labels/enhancement","name":"enhancement","color":"84b6eb","default":true}],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":0,"created_at":"2016-11-03T15:51:19Z","updated_at":"2016-11-03T15:51:19Z","closed_at":null,"body":"`myway` supports marker-substitution for Stored Procedures.\r\n\r\nFlyway has a more generic placeholder replacement system for terms in the form of ’${placeholder}`.\r\n\r\nIn many ways, this feature raises more questions than it answers - since changing the value substituted for a given placeholder could significantly change the action taken as a result, this value would need to be stored and validated.  Should it be considered an error to re-run a migration with a different substitution against the same database?  Should a migration where a placeholder value is not specified inherit the previous value?  Do we now have to pre-process all migrations to ensure that all placeholders have provided values?\r\n\r\nThe stated Flyway use-case for this feature is to perform different actions in different environments - something which `myway` achieves in an arguably cleaner fashion via the '`environment`' metadata directive."}}
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