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f764993640
Implement the **drop column** migration operation. A migration to drop a column looks like this: ```json { "name": "09_drop_column", "operations": [ { "drop_column": { "table": "fruits", "column": "price", "down": "0" } } ] } ``` The migration takes the name of the table and column that should be dropped along with (optionally) some `down` SQL to run to populate the field in the underlying table when insertions are done via the new schema version while the migration is in progress. * On `Start`, the relevant view in the new version schema is created without the dropped column. The column is not deleted from the underlying table. * If `down` SQL is specified, a trigger is created on the underlying table to populate the column to be removed when inserts are made from the new schema version. * On `Rollback` any triggers on the underlying table are removed. * On `Complete` the old version of the schema is removed and the column is removed from the underlying table. Any triggers are also removed.
13 lines
171 B
JSON
13 lines
171 B
JSON
{
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"name": "09_drop_column",
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"operations": [
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{
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"drop_column": {
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"table": "fruits",
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"column": "price",
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"down": "0"
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}
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}
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]
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}
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