Commit 3570bce

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Append method PostgreSQLCursor::Cursor#size for ActiveRecord collection rendering

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Lines changed: 11 additions & 0 deletions

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`@@ -88,6 +88,17 @@ Product.each_row.map {\|r\| r["id"].to_i } #=> [1, 2, 3, ...]`
`88`	`88`	`Product.each_instance.map {\|r\| r.id }.each {\|id\| p id } #=> [1, 2, 3, ...]`
`89`	`89`	`Product.each_instance.lazy.inject(0) {\|sum,r\| sum + r.quantity } #=> 499500`
`90`	`90`	```
	`91`	`+`
	`92`	`+### PostgreSQLCursor and collection rendering`
	`93`	`+`
	`94`	`+You can render cursor collection, using enumeration as collection attribute.`
	`95`	`+`
	`96`	+```ruby
	`97`	`+render partial: "some_partial", collection: Product.each_instance`
	`98`	`+render partial: "some_partial", collection: Product.each_row`
	`99`	`+render partial: "some_partial", collection: Product.each_hash`
	`100`	+```
	`101`	`+`
`91`	`102`	`### Hashes vs. Instances`
`92`	`103`
`93`	`104`	`The each_row method returns the Hash of strings for speed (as this allows you to process a lot of rows).`

Lines changed: 6 additions & 0 deletions

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`@@ -71,6 +71,12 @@ def iterate_batched(batched = true)`
`71`	`71`	`self`
`72`	`72`	`end`
`73`	`73`
	`74`	`+ # ActiveRecord call #size when rendering a collection`
	`75`	`+ # Define it and return some dummy value`
	`76`	`+ def size`
	`77`	`+ -1`
	`78`	`+ end`
	`79`	`+`
`74`	`80`	`# Public: Yields each row of the result set to the passed block`
`75`	`81`	`#`
`76`	`82`	`# Yields the row to the block. The row is a hash with symbolized keys.`

Lines changed: 9 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -225,4 +225,13 @@ def test_relation_association_is_not_loaded`
`225`	`225`	`cursor = Product.first.prices.each_instance`
`226`	`226`	`refute cursor.instance_variable_get(:@type).loaded?`
`227`	`227`	`end`
	`228`	`+`
	`229`	`+ def test_size`
	`230`	`+ r = Product.each_instance`
	`231`	`+ assert_equal -1, r.size`
	`232`	`+ r = Product.each_hash`
	`233`	`+ assert_equal -1, r.size`
	`234`	`+ r = Product.each_row`
	`235`	`+ assert_equal -1, r.size`
	`236`	`+ end`
`228`	`237`	`end`

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