Details
Major - P3
Description
MongoDB is missing a $replace operator to perform search/replace operations on strings. MongoDB cannot currently perform the equivalent of the below SQL statement without updating each item individually:
UPDATE table SET column1 = REPLACE(column1, 'search', 'replace');
The modifier operator I propose would look like this:
db.coll.update(
{a: 1}, {$replace: {myprop: ["foo", "bar"]}});
The above statement would find all of the documents whose "a" property is 1, and replace "foo" with "bar" in the "myprop" property of said documents. A patch is attached that demonstrates this functionality. The operator should eventually support regular expressions and maybe even arrays, e.g.:
db.coll.update(
{a: 1}, {$replace: {myprop: [/foo\d+/, "bar"]}});
The above would replace all instances of "foo", followed by one or more digits, with the string "bar".
Issue Links
- is related to
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SERVER-743
$append modifier
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- Open
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Activity
Will the replacement work only on whole strings, or on sub-strings as well?
a) only replace "foo1" with "bar", but "foo1b" would stay untouched
b) "foo1b" would be changed to "barb"
What version does that patch get folded into?