ruby on rails - How to replace tag with some value in XML using Nokogiri -


i have predefine xml template tags need replaced. tag values come dynamically front-end.

<?xml version="1.0"?> <catalog>    <book id="bk101">       <author>author1</author>       <title>title1</title>       <genre>computer</genre>       <price>44.95</price>       <publish_date>2000-10-01</publish_date>       <description>an in-depth @ creating applications        xml.</description>    </book>    <book id="bk102">       <author>author2</author>       <title>title2</title>       <genre>fantasy</genre>       <price>5.95</price>       <publish_date>2000-12-16</publish_date>       <description>a former architect battles corporate zombies,        evil sorceress, , own childhood become queen        of world.</description>    </book>  </catalog>

in above example need replace title1, title2, author1, author2 actual value dynamically.

what best way this? using nokogiri in ruby code have had no luck.

the basic idea need search xml <book> tags. each book found, retrieve block of values apply it. find <author> tag , replace text. find <title> tag, , replace text also. go next book.

however, in example, writing code overkill when simple gsub in 1 pass:

xml = '<?xml version="1.0"?> <catalog>    <book id="bk101">       <author>author1</author>       <title>title1</title>       <genre>computer</genre>       <price>44.95</price>       <publish_date>2000-10-01</publish_date>       <description>an in-depth @ creating applications        xml.</description>    </book>    <book id="bk102">       <author>author2</author>       <title>title2</title>       <genre>fantasy</genre>       <price>5.95</price>       <publish_date>2000-12-16</publish_date>       <description>a former architect battles corporate zombies,        evil sorceress, , own childhood become queen        of world.</description>    </book>  </catalog> '  values = {   'title1' => 'moby dick',   'author1' => 'herman melville',   'title2' => 'tom sawyer',   'author2' => 'mark twain', }  puts xml.gsub(regexp.union(values.keys), values) # >> <?xml version="1.0"?> # >> <catalog> # >>    <book id="bk101"> # >>       <author>herman melville</author> # >>       <title>moby dick</title> # >>       <genre>computer</genre> # >>       <price>44.95</price> # >>       <publish_date>2000-10-01</publish_date> # >>       <description>an in-depth @ creating applications  # >>       xml.</description> # >>    </book> # >>    <book id="bk102"> # >>       <author>mark twain</author> # >>       <title>tom sawyer</title> # >>       <genre>fantasy</genre> # >>       <price>5.95</price> # >>       <publish_date>2000-12-16</publish_date> # >>       <description>a former architect battles corporate zombies,  # >>       evil sorceress, , own childhood become queen  # >>       of world.</description> # >>    </book> # >>  </catalog>

this use of gsub isn't used often, i've used many times when substituting values templates. using tags/keys guaranteed unique in document essential, flag them using leading , trailing double underscores. in other words __title1__, __author1__, etc.

doing can replace content of other fields, such <genre>, <price>, etc.

name variables in form same keys/tags, , task becomes easier because should receive hash of field-names , field-values, becomes source hash used in gsub.

be sure verify/sanitize values before substituting. users mistype , malicious ones can deliberately enter data in attempt break code, or worse, whatever xml fed into.


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