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Add documents #81

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Add documents #81

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d90d376
Write path information for db:data:dump_dir and db:data:load_dir.
nishidayuya Jun 18, 2015
6c659bf
Write `Usage` section about `dir` parameter.
nishidayuya Jun 18, 2015
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9 changes: 7 additions & 2 deletions README.md
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Expand Up @@ -25,8 +25,13 @@ All rake tasks will then be available to you.

Further, there are tasks db:dump and db:load which do the entire database (the equivalent of running db:schema:dump followed by db:data:load). Also, there are other tasks recently added that allow the export of the database contents to/from multiple files (each one named after the table being dumped or loaded).

rake db:data:dump_dir -> Dump contents of database to curr_dir_name/tablename.extension (defaults to yaml)
rake db:data:load_dir -> Load contents of db/data_dir into database
rake db:data:dump_dir -> Dump contents of database to db/<data_dir>/<tablename>.<extension> (defaults to yaml)
rake db:data:load_dir -> Load contents of db/<data_dir> into database

Default `<data_dir>` is `%F_%T` (see Ruby's Time#strftime). And we can change `<data_dir>` by `dir` parameter.

rake db:data:dump_dir dir=before_exciting_migrations -> Dump contents of database to db/before_exciting_migrations/<tablename>.<extension>
rake db:data:load_dir dir=before_exciting_migrations -> Load contents of db/before_exciting_migrations/ into database

In addition, we have plugins whereby you can export your database to/from various formats. We only deal with yaml and csv right now, but you can easily write tools for your own formats (such as Excel or XML). To use another format, just load setting the "class" parameter to the class you are using. This defaults to "YamlDb::Helper" which is a refactoring of the old yaml_db code. We'll shorten this to use class nicknames in a little bit.

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