The FieldExpression Class
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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
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 the content
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.
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Last updated 2024-10-01 UTC.
[{
"type": "thumb-down",
"id": "hardToUnderstand",
"label":"Hard to understand"
},{
"type": "thumb-down",
"id": "incorrectInformationOrSampleCode",
"label":"Incorrect information or sample code"
},{
"type": "thumb-down",
"id": "missingTheInformationSamplesINeed",
"label":"Missing the information/samples I need"
},{
"type": "thumb-down",
"id": "otherDown",
"label":"Other"
}]
[{
"type": "thumb-up",
"id": "easyToUnderstand",
"label":"Easy to understand"
},{
"type": "thumb-up",
"id": "solvedMyProblem",
"label":"Solved my problem"
},{
"type": "thumb-up",
"id": "otherUp",
"label":"Other"
}]
{"lastModified": "Last updated 2024-10-01 UTC."}
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2024-10-01 UTC."]]