Add min/max/sum/avg to the query gen

boil/qm/query_mods.go

@@ -95,3 +95,38 @@ func From(from string) QueryMod {
 		boil.AppendFrom(q, from)
 	}
 }
+
+// Count turns the query into a counting calculation
+func Count() QueryMod {
+	return func(q *boil.Query) {
+		boil.SetCount(q)
+	}
+}
+
+// Avg turns the query into an average calculation
+func Avg() QueryMod {
+	return func(q *boil.Query) {
+		boil.SetAvg(q)
+	}
+}
+
+// Min turns the query into a minimum calculation
+func Min() QueryMod {
+	return func(q *boil.Query) {
+		boil.SetMin(q)
+	}
+}
+
+// Max turns the query into a maximum calculation
+func Max() QueryMod {
+	return func(q *boil.Query) {
+		boil.SetMax(q)
+	}
+}
+
+// Sum turns the query into a sum calculation
+func Sum() QueryMod {
+	return func(q *boil.Query) {
+		boil.SetSum(q)
+	}
+}

boil/query.go

@@ -7,20 +7,20 @@ import (
 
 // Query holds the state for the built up query
 type Query struct {
-	executor   Executor
-	plainSQL   plainSQL
-	delete     bool
-	update     map[string]interface{}
-	selectCols []string
-	count      bool
-	from       []string
-	innerJoins []join
-	where      []where
-	groupBy    []string
-	orderBy    []string
-	having     []string
-	limit      int
-	offset     int
+	executor    Executor
+	plainSQL    plainSQL
+	delete      bool
+	update      map[string]interface{}
+	selectCols  []string
+	modFunction string
+	from        []string
+	innerJoins  []join
+	where       []where
+	groupBy     []string
+	orderBy     []string
+	having      []string
+	limit       int
+	offset      int
 }
 
 type where struct {
@@ -64,7 +64,27 @@ func SetSQL(q *Query, sql string, args ...interface{}) {
 
 // SetCount on the query.
 func SetCount(q *Query) {
-	q.count = true
+	q.modFunction = "COUNT"
+}
+
+// SetAvg on the query.
+func SetAvg(q *Query) {
+	q.modFunction = "AVG"
+}
+
+// SetMax on the query.
+func SetMax(q *Query) {
+	q.modFunction = "MAX"
+}
+
+// SetMin on the query.
+func SetMin(q *Query) {
+	q.modFunction = "MIN"
+}
+
+// SetSum on the query.
+func SetSum(q *Query) {
+	q.modFunction = "SUM"
 }
 
 // SetDelete on the query.

boil/query_builders.go

@@ -37,22 +37,22 @@ func buildSelectQuery(q *Query) (*bytes.Buffer, []interface{}) {
 
 	buf.WriteString("SELECT ")
 
-	if q.count {
-		buf.WriteString("COUNT(")
+	// Wrap the select in the modifier function
+	hasModFunc := len(q.modFunction) != 0
+	if hasModFunc {
+		fmt.Fprintf(buf, "%s(", q.modFunction)
 	}
 
-	if len(q.innerJoins) > 0 && !q.count {
+	hasSelectCols := len(q.selectCols) != 0
+	if len(q.innerJoins) != 0 && hasSelectCols && !hasModFunc {
 		writeComplexSelect(q, buf)
+	} else if hasSelectCols {
+		buf.WriteString(strings.Join(strmangle.IdentQuoteSlice(q.selectCols), `, `))
 	} else {
-		if len(q.selectCols) > 0 {
-			buf.WriteString(strings.Join(strmangle.IdentQuoteSlice(q.selectCols), `, `))
-		} else {
-			buf.WriteByte('*')
-		}
+		buf.WriteByte('*')
 	}
 
-	// close sql COUNT function
-	if q.count {
+	if hasModFunc {
 		buf.WriteString(")")
 	}
 
@@ -78,6 +78,12 @@ func buildSelectQuery(q *Query) (*bytes.Buffer, []interface{}) {
 }
 
 func writeComplexSelect(q *Query, buf *bytes.Buffer) {
+	cols := make([]string, len(q.selectCols))
+	for _, col := range q.selectCols {
+		if !rgxIdentifier.Match {
+			cols
+		}
+	}
 }
 
 func buildDeleteQuery(q *Query) (*bytes.Buffer, []interface{}) {