错误：没有与 ON CONFLICT 规范匹配的唯一或排除约束

Question

I'm trying to perform upsert against a table named feature_to_model. However, I get the following error:

ERROR: there is no unique or exclusion constraint matching the ON CONFLICT specification (SQLSTATE 42P10)

Here's my table specifications:

CREATE TABLE IF NOT EXISTS feature_to_model (
training_job_id     varchar NOT NULL,
feature_name        varchar NOT NULL,
feature_set_name    varchar NOT NULL,
model_name          varchar NOT NULL,
created_at          timestamp with time zone DEFAULT now() NOT NULL,
PRIMARY KEY (training_job_id, feature_name, feature_set_name)

I use Gorm to query the db here's my function call for that:

func (s *store) UpsertFeatureToModel(f2m *model.FeatureToModel) (*model.FeatureToModel, error) {
    result := s.db.Table(f2mTable).Clauses(clause.OnConflict{
        UpdateAll: true,
    }).Create(f2m)
    if result.Error != nil {
        return nil, result.Error
    }
    return f2m, nil
}

What am I missing? I cannot use UNIQUE constraint on any of the indices (training_job_id, feature_name, feature_set_name are index), because none of them are unique

Answer 1

ERROR: there is no unique or exclusion constraint matching the ON CONFLICT specification in

This because training_job_id is a column referenced in a FOREIGN KEY CONSTRAINT and not an index. In fact, if you want that to be faster, you may consider additionally adding an index. From the docs on ON CONFLICT

You probably want something like this,

CREATE TABLE IF NOT EXISTS feature_to_model (
training_job_id     varchar NOT NULL,
feature_name        varchar NOT NULL,
feature_set_name    varchar NOT NULL,
model_name          varchar NOT NULL,
created_at          timestamp with time zone DEFAULT now() NOT NULL,
PRIMARY KEY (training_job_id, feature_name, feature_set_name)
CONSTRAINT UC_feature_to_model UNIQUE (training_job_id)