Class
FieldExpression
allows you to compute customized content snippets for each result returned by a search.
FieldExpression
is defined in the module
google.appengine.api.search
.
- Constructor
- Properties:
Constructor
The constructor for class
FieldExpression
is defined as follows:
-
class FieldExpression ( name , expression )
-
Construct an instance of class
FieldExpression
.For example,
FieldExpression(name='content_snippet', expression='snippet("very important", content)')
constructs a field expression that returns a computed field named
content-snippet
with each search result, containing HTML snippets of thecontent
field that match the query"very
important"
. -
Arguments
- name
-
Name of computed field.
- expression
-
Expression to evaluate and return.
Result value
-
A new instance of class
FieldExpression
.
Exceptions
- TypeError
-
A parameter has an invalid type, or an unknown attribute was passed.
- ValueError
-
A parameter has an invalid value.
Properties
An instance of class
FieldExpression
has the following properties:
- name
-
Name of computed field.
- expression
-
String containing expression to evaluate and return.