want to change columntype in a table through migration

Hi i have a t开发者_如何学Pythonable in which there are two columns from and to of type datatime i want to change the datatype from datetime to date. i dont know the exact command for chagning column type in migrations like rails g

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From the command line, run:

rails generate migration change_data_type_for_table_column

Write your migration as:

change_table :table do |t|  
  t.change :column, :type 
end

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Use change_column.

change_column(:table, :column, :date)