migrate custom values to their proper bool representation

db/migrate/20151028063433_boolearlize_bool_custom_values.rb

@@ -0,0 +1,85 @@
+class BoolearlizeBoolCustomValues < ActiveRecord::Migration
+  def up
+    update_custom_values(fake_true, db_true, fake_false, db_false)
+    update_queries(fake_true, db_true_unquoted, fake_false, db_false_unquoted)
+  end
+
+  def down
+    update_custom_values(db_true, fake_true, db_false, fake_false)
+    update_queries(db_true_unquoted, fake_true, db_false_unquoted, fake_false)
+  end
+
+  private
+
+  def update_custom_values(old_true, new_true, old_false, new_false)
+    bool_custom_fields.each do |bool_custom_field|
+      alter(CustomValue, bool_custom_field, old_false, new_false)
+      alter(CustomValue, bool_custom_field, old_true, new_true)
+      alter(CustomizableJournal, bool_custom_field, old_false, new_false)
+      alter(CustomizableJournal, bool_custom_field, old_true, new_true)
+    end
+  end
+
+  def update_queries(old_true, new_true, old_false, new_false)
+    queries = Query.all
+
+    queries.each do |query|
+      query.filters.each do |filter|
+        update_filter(filter, old_true, new_true, old_false, new_false)
+      end
+      query.save
+    end
+  end
+
+  def update_filter(filter, old_true, new_true, old_false, new_false)
+    custom_field_match = filter.field.to_s.match(/\Acf_(\d+)\z/)
+
+    return unless custom_field_match
+
+    custom_field_id = custom_field_match[1].to_i
+
+    bool_custom_field = bool_custom_fields.find { |cf| cf.id == custom_field_id }
+
+    return unless bool_custom_field
+
+    filter
+      .values
+      .map! { |v| v == old_false ? new_false : v }
+      .map! { |v| v == old_true ? new_true : v }
+  end
+
+  def bool_custom_fields
+    @bool_custom_fields ||= CustomField.where(field_format: 'bool').all
+  end
+
+  def alter(scope, custom_field, old, new)
+    scope
+      .where(custom_field_id: custom_field.id,
+             value: old)
+      .update_all(value: new)
+  end
+
+  def db_false
+    ActiveRecord::Base.connection.quoted_false
+  end
+
+  def db_true
+    ActiveRecord::Base.connection.quoted_true
+  end
+
+  def db_false_unquoted
+    ActiveRecord::Base.connection.unquoted_false
+  end
+
+  def db_true_unquoted
+    ActiveRecord::Base.connection.unquoted_true
+  end
+
+  def fake_false
+    '0'
+  end
+
+  def fake_true
+    '1'
+  end
+end