Hi folks! Can someone help me find the problem with my migration,
below? It's working fine on my local environment, but when I run it
in Heroku I get 'an instance of IO needed' error. I shouldn't need an
IO instance since I'm passing a string to the method--or at least
that's the intent. The intent of the code is to read from the
database a serialized instance of a Grid, deserialize the object,
create a StaggeredGrid based on the contents, then serialize the new
object. I can't do this directly at the ActiveRecord level because
the active record object that owns the grid is expecting a
StaggeredGrid and fails validation.
Any ideas? Thanks in advance!
=== migration file:
# This seems to be required for YAML::load since the Grid class is
never
# directly invoked
require 'lib/grid'
require 'lib/staggered_grid'
class GridToStaggeredGrid < ActiveRecord::Migration
def self.up
say_with_time "Changing existing grids to staggered grids..." do
suppress_messages do
grids = execute "SELECT id, grid FROM grids"
grids.each do |grid|
old_grid = YAML::load(grid[1])
new_grid = StaggeredGrid.new old_grid.row_count,
old_grid.column_count
old_grid.each_with_coordinates do | cell, row, column |
new_grid[row][column] = cell
end
result = execute "UPDATE challenges SET grid =
'#{YAML::dump(new_grid)}' WHERE id = #{grid[0]}"
end
end
end
end
def self.down
say_with_time "Changing existing staggered grids back to grids..."
do
suppress_messages do
grids = execute "SELECT id, grid FROM grids"
grids.each do |grid|
old_grid = YAML::load grid[1]
new_grid = Grid.new old_grid.row_count,
old_grid.column_count
old_grid.each_with_coordinates do | cell, row, column |
new_grid[row][column] = cell
end
result = execute "UPDATE challenges SET grid =
'#{YAML::dump(new_grid)}' WHERE id = #{grid[0]}"
end
end
end
end
end
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