Query example

Author: estolfo

examples/query.rb

@@ -0,0 +1,84 @@
+# Query for all documents in a collection
+
+cursor = client[:restaurants].find
+
+cursor.each do |doc|
+  puts doc
+end
+
+
+# Query for equality on a top level field
+
+cursor = client[:restaurants].find('borough' => 'Manhattan')
+
+cursor.each do |doc|
+  puts doc
+end
+
+
+# Query by a field in an embedded document
+
+cursor = client[:restaurants].find('address.zipcode' => '10075')
+
+cursor.each do |doc|
+  puts doc
+end
+
+
+# Query by a field in an array
+
+cursor = client[:restaurants].find('grades.grade' => 'B')
+
+cursor.each do |doc|
+  puts doc
+end
+
+
+# Query with the greater-than operator
+
+cursor = client[:restaurants].find('grades.score' => { '$gt' => 30 })
+
+cursor.each do |doc|
+  puts doc
+end
+
+
+# Query with the less-than operator
+
+cursor = client[:restaurants].find('grades.score' => { '$lt' => 10 })
+
+cursor.each do |doc|
+  puts doc
+end
+
+
+# Query with a logical conjuction (AND) of query conditions
+
+cursor = client[:restaurants].find({ 'cuisine' => 'Italian',
+                                     'address.zipcode' => '10075'})
+
+cursor.each do |doc|
+  puts doc
+end
+
+
+# Query with a logical disjunction (OR) of query conditions
+
+cursor = client[:restaurants].find('$or' => [{ 'cuisine' => 'Italian' },
+                                             { 'address.zipcode' => '10075'}
+                                            ]
+                                  )
+
+cursor.each do |doc|
+  puts doc
+end
+
+
+# Sort query results
+
+cursor = client[:restaurants].find.sort('borough' => Mongo::Index::ASCENDING,
+                                        'address.zipcode' => Mongo::Index::DESCENDING)
+
+cursor.each do |doc|
+  puts doc
+end