Rails-AddColumnIndex.md

Pattern: Use of add_column with index key

Issue: -

Description

Checks for migrations using add_column that have an index key. add_column does not accept index, but also does not raise an error for extra keys, so it is possible to mistakenly add the key without realizing it will not actually add an index.

Examples

# bad (will not add an index)
add_column :table, :column, :integer, index: true

# good
add_column :table, :column, :integer
add_index :table, :column

Further Reading

• RuboCop - Rails/AddColumnIndex