问题
I have some entities that have a StringProperty and I would like to query for all the entities that match a substring. Is there a way to do that using just GQL?
For example, if my datastore looks like this:
ID/Name question_text
--------------------------------------------------------------
3001 I like to eat chicken.
3020 I only like to eat chicken that is deep fried.
3045 I like filet mignon.
3052 I like cheese.
What would the GQL query be to find all the entities that contain 'chicken' in question_text?
回答1:
What you're looking for is full-text search over a StringProperty. This is what SearchableModel was created for.
Basically, it creates a new property on your entity that is a list of all the strings (and I believe bi- and tri-grams) in the text field, using the task queue. Then searching for "chicken" is done by a GQL query like SELECT * FROM whatever WHERE 'chicken' IN strings_list
来源：https://stackoverflow.com/questions/3172292/gql-find-all-entities-that-contain-a-substring