Comments on: “Ruby on Rails: Up and Running,” by Bruce A. Tate and Curt Hibbs http://www.errantdreams.com/reviews/2006/11/23/ruby-on-rails-up-and-running-by-bruce-a-tate-and-curt-hibbs/ 650+ book reviews, kitchenware reviews, and more. We may be insane, but we're on your side! Thu, 21 Aug 2008 17:32:11 +0000 http://wordpress.org/?v=2.6.1 By: Jimmy http://www.errantdreams.com/reviews/2006/11/23/ruby-on-rails-up-and-running-by-bruce-a-tate-and-curt-hibbs/#comment-5146 Jimmy Wed, 10 Oct 2007 23:48:49 +0000 http://www.errantdreams.com/reviews/?p=493#comment-5146 I like this book because it is short, thin, and to the point. It gives me just enough information to get started. The examples worked fine until I tried the drag & drop one. This is probably not the place to ask a question like this. But, please let me... The error from drag & drop operation: Processing SlideshowsController#add_photo (for 10.71.1.169 at 2007-10-10 14:44:43) [POST] Session ID: 253902577ac03cf8a5c6393c3721dade Parameters: {"action"=>"add_photo", "id"=>"photo_3", "controller"=>"slideshows"} SQL (0.002208)  SELECT a.attname, format_type(a.atttypid, a.atttypmod), d.adsrc, a.attnotnull FROM pg_attribute a LEFT JOIN pg_attrdef d ON a.attrelid = d.adrelid AND a.attnum = d.adnum WHERE a.attrelid = 'slides'::regclass AND a.attnum > 0 AND NOT a.attisdropped ORDER BY a.attnum  SQL (0.000436) BEGIN Slide Load (0.000000) RuntimeError: ERROR C42804 Margument of WHERE must be type boolean, not type integer Fparse_coerce.c L818 Rcoerce_to_boolean: SELECT * FROM slides WHERE (slideshow_id) ORDER BY position DESC LIMIT 1 SQL (0.000429) ROLLBACK ActiveRecord::StatementInvalid (RuntimeError: ERROR C42804 Margument of WHERE must be type boolean, not type integer Fparse_coerce.c L818 Rcoerce_to_boolean: SELECT * FROM slides WHERE (slideshow_id) ORDER BY position DESC LIMIT 1): ........ Based on the above error, the problem seems to be with the generated select statement. SELECT * FROM slides WHERE (slideshow_id) ORDER BY position DESC LIMIT 1) Instead, it should be: SELECT * FROM slides WHERE (slideshow_id = 3) ORDER BY position DESC LIMIT 1) I also tried the following: >> slide = Slide.find 1 >> slideshow = slide.slideshow >> slideshow.slides.first.move_to_bottom ActiveRecord::StatementInvalid: RuntimeError: ERROR C42804 Margument of AND must be type boolean, not type integer Fparse_coerce.c L818 Rcoerce_to_boolean: UPDATE slides SET position = (position - 1) WHERE (slideshow_id AND position > 1) Same kind of problem. The update statement should be like: UPDATE slides SET position = (position - 1) WHERE (slideshow_id = 3 AND position > 1) I am not sure how to correct this problem. I understand that you finished this book more than 10 months ago, if you still have the example in your computer somewhere, please help. Thank you very much. I like this book because it is short, thin, and to the point. It gives me just enough information to get started. The examples worked fine until I tried the drag & drop one.

This is probably not the place to ask a question like this. But, please let me…

The error from drag & drop operation:

Processing SlideshowsController#add_photo (for 10.71.1.169 at 2007-10-10 14:44:43) [POST]
Session ID: 253902577ac03cf8a5c6393c3721dade
Parameters: {”action”=>”add_photo”, “id”=>”photo_3″, “controller”=>”slideshows”}
SQL (0.002208)  SELECT a.attname, format_type(a.atttypid, a.atttypmod), d.adsrc, a.attnotnull
FROM pg_attribute a LEFT JOIN pg_attrdef d
ON a.attrelid = d.adrelid AND a.attnum = d.adnum
WHERE a.attrelid = ’slides’::regclass
AND a.attnum > 0 AND NOT a.attisdropped
ORDER BY a.attnum

SQL (0.000436) BEGIN
Slide Load (0.000000) RuntimeError: ERROR C42804 Margument of WHERE must be type boolean, not type integer Fparse_coerce.c L818 Rcoerce_to_boolean: SELECT * FROM slides WHERE (slideshow_id) ORDER BY position DESC LIMIT 1
SQL (0.000429) ROLLBACK

ActiveRecord::StatementInvalid (RuntimeError: ERROR C42804 Margument of WHERE must be type boolean, not type integer Fparse_coerce.c L818 Rcoerce_to_boolean: SELECT * FROM slides WHERE (slideshow_id) ORDER BY position DESC LIMIT 1):
……..

Based on the above error, the problem seems to be with the generated select statement.

SELECT * FROM slides WHERE (slideshow_id) ORDER BY position DESC LIMIT 1)

Instead, it should be:

SELECT * FROM slides WHERE (slideshow_id = 3) ORDER BY position DESC LIMIT 1)

I also tried the following:

>> slide = Slide.find 1
>> slideshow = slide.slideshow
>> slideshow.slides.first.move_to_bottom
ActiveRecord::StatementInvalid: RuntimeError: ERROR C42804 Margument of AND must be type boolean, not type integer Fparse_coerce.c L818 Rcoerce_to_boolean: UPDATE slides SET position = (position - 1) WHERE (slideshow_id AND position > 1)

Same kind of problem. The update statement should be like:

UPDATE slides SET position = (position - 1) WHERE (slideshow_id = 3 AND position > 1)

I am not sure how to correct this problem. I understand that you finished this book more than 10 months ago, if you still have the example in your computer somewhere, please help. Thank you very much.

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