How to get the current schema

Hi,
anyone can help on this? in the dbt_project.yml, i set different model folder to be created in different schema. now want to get current schema during the model create, how would i do that? tried {{target.schema}}, but it doesn;t work. my dbt_project.yml is seting as below, for the model/snapshot folder, i put target_schema and schema to be “semantic_snapshot”. but when use {{target.schema}}, it always return other schema? i am expect to see semantic_snapshot.
also, what would be the difference between +target_schema and +schema?
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Thanks so much for the help.
ALEX