Merge branch 'eager'

boil/qm/query_mods.go

@@ -19,17 +19,14 @@ func SQL(sql string, args ...interface{}) QueryMod {
 	}
 }
 
-// Limit the number of returned rows
-func Limit(limit int) QueryMod {
+// Load allows you to specify foreign key relationships to eager load
+// for your query. Passed in relationships need to be in the format
+// MyThing or MyThings.
+// Relationship name plurality is important, if your relationship is
+// singular, you need to specify the singular form and vice versa.
+func Load(relationships ...string) QueryMod {
 	return func(q *boil.Query) {
-		boil.SetLimit(q, limit)
-	}
-}
-
-// Offset into the results
-func Offset(offset int) QueryMod {
-	return func(q *boil.Query) {
-		boil.SetOffset(q, offset)
+		boil.SetLoad(q, relationships...)
 	}
 }
 
@@ -126,6 +123,20 @@ func From(from string) QueryMod {
 	}
 }
 
+// Limit the number of returned rows
+func Limit(limit int) QueryMod {
+	return func(q *boil.Query) {
+		boil.SetLimit(q, limit)
+	}
+}
+
+// Offset into the results
+func Offset(offset int) QueryMod {
+	return func(q *boil.Query) {
+		boil.SetOffset(q, offset)
+	}
+}
+
 // Count turns the query into a counting calculation
 func Count() QueryMod {
 	return func(q *boil.Query) {

boil/query.go

@@ -20,6 +20,7 @@ const (
 type Query struct {
 	executor    Executor
 	plainSQL    plainSQL
+	load        []string
 	delete      bool
 	update      map[string]interface{}
 	selectCols  []string
@@ -113,6 +114,11 @@ func SetSQL(q *Query, sql string, args ...interface{}) {
 	q.plainSQL = plainSQL{sql: sql, args: args}
 }
 
+// SetLoad on the query.
+func SetLoad(q *Query, relationships ...string) {
+	q.load = append([]string(nil), relationships...)
+}
+
 // SetCount on the query.
 func SetCount(q *Query) {
 	q.modFunction = "COUNT"

boil/query_test.go

@@ -45,6 +45,21 @@ func TestSetSQL(t *testing.T) {
 	}
 }
 
+func TestSetLoad(t *testing.T) {
+	t.Parallel()
+
+	q := &Query{}
+	SetLoad(q, "one", "two")
+
+	if len(q.load) != 2 {
+		t.Errorf("Expected len 2, got %d", len(q.load))
+	}
+
+	if q.load[0] != "one" || q.load[1] != "two" {
+		t.Errorf("Was not expected string, got %s", q.load)
+	}
+}
+
 func TestAppendWhere(t *testing.T) {
 	t.Parallel()
 

boil/reflect.go

@@ -16,7 +16,7 @@ var (
 
 // BindP executes the query and inserts the
 // result into the passed in object pointer.
-// It panics on error.
+// It panics on error. See boil.Bind() documentation.
 func (q *Query) BindP(obj interface{}) {
 	if err := q.Bind(obj); err != nil {
 		panic(WrapErr(err))
@@ -27,12 +27,13 @@ func (q *Query) BindP(obj interface{}) {
 // result into the passed in object pointer
 //
 // Bind rules:
-// - Struct tags control bind, in the form of: `boil:"name,bind"`
-// - If the "name" part of the struct tag is specified, that will be used
-// for binding instead of the snake_cased field name.
-// - If the ",bind" option is specified on an struct field, it will be recursed
-// into to look for fields for binding.
-// - If the name of the struct tag is "-", this field will not be bound to
+//   - Struct tags control bind, in the form of: `boil:"name,bind"`
+//   - If the "name" part of the struct tag is specified, that will be used
+//   - f the "name" part of the tag is specified, it is used for binding
+//     (the columns returned are title cased and matched).
+//   - If the ",bind" option is specified on an struct field, it will be recursed
+//     into to look for fields for binding.
+//   - If the name of the struct tag is "-", this field will not be bound to
 //
 // Example Query:
 //
@@ -49,14 +50,105 @@ func (q *Query) BindP(obj interface{}) {
 //   }
 //
 //   models.Users(qm.InnerJoin("users as friend on users.friend_id = friend.id")).Bind(&joinStruct)
+//
+// For custom objects that want to use eager loading, please see the
+// loadRelationships function.
+func Bind(rows *sql.Rows, obj interface{}) error {
+	structType, sliceType, singular, err := bindChecks(obj)
+
+	if err != nil {
+		return err
+	}
+
+	return bind(rows, obj, structType, sliceType, singular)
+}
+
+// Bind executes the query and inserts the
+// result into the passed in object pointer
+//
+// See documentation for boil.Bind()
 func (q *Query) Bind(obj interface{}) error {
+	structType, sliceType, singular, err := bindChecks(obj)
+	if err != nil {
+		return err
+	}
+
+	rows, err := ExecQueryAll(q)
+	if err != nil {
+		return errors.Wrap(err, "bind failed to execute query")
+	}
+	defer rows.Close()
+
+	if res := bind(rows, obj, structType, sliceType, singular); res != nil {
+		return res
+	}
+
+	if len(q.load) == 0 {
+		return nil
+	}
+
+	return q.loadRelationships(obj, singular)
+}
+
+// loadRelationships dynamically calls the template generated eager load
+// functions of the form:
+//
+//   func (t *TableRelationships) LoadRelationshipName(exec Executor, singular bool, obj interface{})
+//
+// The arguments to this function are:
+//   - t is not considered here, and is always passed nil. The function exists on a relationships
+//     struct to avoid a circular dependency with boil, and the receiver is ignored.
+//   - exec is used to perform additional queries that might be required for loading the relationships.
+//   - singular is passed in to identify whether or not this was a single object
+//     or a slice that must be loaded into.
+//   - obj is the object or slice of objects, always of the type *obj or *[]*obj as per bind.
+func (q *Query) loadRelationships(obj interface{}, singular bool) error {
+	typ := reflect.TypeOf(obj).Elem()
+	if !singular {
+		typ = typ.Elem()
+	}
+
+	rel, found := typ.FieldByName("Relationships")
+	// If the users object has no Relationships struct, it must be
+	// a custom object and we should not attempt to load any relationships.
+	if !found {
+		return errors.New("load query mod was used but bound struct contained no relationship field")
+	}
+
+	for _, relationship := range q.load {
+		// Attempt to find the LoadRelationshipName function
+		loadMethod, found := rel.Type.MethodByName("Load" + relationship)
+		if !found {
+			return errors.Errorf("could not find Load%s method for eager loading", relationship)
+		}
+
+		execArg := reflect.ValueOf(q.executor)
+		if !execArg.IsValid() {
+			execArg = reflect.ValueOf((*sql.DB)(nil))
+		}
+
+		methodArgs := []reflect.Value{
+			reflect.Indirect(reflect.New(rel.Type)),
+			execArg,
+			reflect.ValueOf(singular),
+			reflect.ValueOf(obj),
+		}
+
+		resp := loadMethod.Func.Call(methodArgs)
+		if resp[0].Interface() != nil {
+			return resp[0].Interface().(error)
+		}
+	}
+
+	return nil
+}
+
+// bindChecks resolves information about the bind target, and errors if it's not an object
+// we can bind to.
+func bindChecks(obj interface{}) (structType reflect.Type, sliceType reflect.Type, singular bool, err error) {
 	typ := reflect.TypeOf(obj)
 	kind := typ.Kind()
 
-	var structType reflect.Type
-	var sliceType reflect.Type
-	var singular bool
-
 	for i := 0; i < len(bindAccepts); i++ {
 		exp := bindAccepts[i]
 
@@ -72,7 +164,7 @@ func (q *Query) Bind(obj interface{}) error {
 				break
 			}
 
-			return errors.Errorf("obj type should be *[]*Type or *Type but was %q", reflect.TypeOf(obj).String())
+			return nil, nil, false, errors.Errorf("obj type should be *[]*Type or *Type but was %q", reflect.TypeOf(obj).String())
 		}
 
 		switch kind {
@@ -83,16 +175,10 @@ func (q *Query) Bind(obj interface{}) error {
 		}
 	}
 
-	return bind(q, obj, structType, sliceType, singular)
+	return structType, sliceType, singular, nil
 }
 
-func bind(q *Query, obj interface{}, structType, sliceType reflect.Type, singular bool) error {
-	rows, err := ExecQueryAll(q)
-	if err != nil {
-		return errors.Wrap(err, "bind failed to execute query")
-	}
-	defer rows.Close()
-
+func bind(rows *sql.Rows, obj interface{}, structType, sliceType reflect.Type, singular bool) error {
 	cols, err := rows.Columns()
 	if err != nil {
 		return errors.Wrap(err, "bind failed to get column names")
@@ -228,7 +314,7 @@ func GetStructValues(obj interface{}, columns ...string) []interface{} {
 	for i, c := range columns {
 		field := val.FieldByName(strmangle.TitleCase(c))
 		if !field.IsValid() {
-			panic(fmt.Sprintf("Unable to find field with name: %s\n%#v", strmangle.TitleCase(c), obj))
+			panic(fmt.Sprintf("unable to find field with name: %s\n%#v", strmangle.TitleCase(c), obj))
 		}
 		ret[i] = field.Interface()
 	}
@@ -236,6 +322,24 @@ func GetStructValues(obj interface{}, columns ...string) []interface{} {
 	return ret
 }
 
+// GetSliceValues returns the values (as interface) of the matching columns in obj.
+func GetSliceValues(slice []interface{}, columns ...string) []interface{} {
+	ret := make([]interface{}, len(slice)*len(columns))
+
+	for i, obj := range slice {
+		val := reflect.Indirect(reflect.ValueOf(obj))
+		for j, c := range columns {
+			field := val.FieldByName(strmangle.TitleCase(c))
+			if !field.IsValid() {
+				panic(fmt.Sprintf("unable to find field with name: %s\n%#v", strmangle.TitleCase(c), obj))
+			}
+			ret[i*len(columns)+j] = field.Interface()
+		}
+	}
+
+	return ret
+}
+
 // GetStructPointers returns a slice of pointers to the matching columns in obj
 func GetStructPointers(obj interface{}, columns ...string) []interface{} {
 	val := reflect.ValueOf(obj).Elem()

boil/reflect_test.go

@@ -103,6 +103,53 @@ func TestBindSingular(t *testing.T) {
 	}
 }
 
+var loadFunctionCalled bool
+
+type testRelationshipsStruct struct{}
+
+func (r *testRelationshipsStruct) LoadTestOne(exec Executor, singular bool, obj interface{}) error {
+	loadFunctionCalled = true
+	return nil
+}
+
+func TestLoadRelationshipsSlice(t *testing.T) {
+	// t.Parallel() Function uses globals
+	loadFunctionCalled = false
+
+	testSlice := []*struct {
+		ID            int
+		Relationships *testRelationshipsStruct
+	}{}
+
+	q := Query{load: []string{"TestOne"}, executor: nil}
+	if err := q.loadRelationships(testSlice, false); err != nil {
+		t.Error(err)
+	}
+
+	if !loadFunctionCalled {
+		t.Errorf("Load function was not called for testSlice")
+	}
+}
+
+func TestLoadRelationshipsSingular(t *testing.T) {
+	// t.Parallel() Function uses globals
+	loadFunctionCalled = false
+
+	testSingular := &struct {
+		ID            int
+		Relationships *testRelationshipsStruct
+	}{}
+
+	q := Query{load: []string{"TestOne"}, executor: nil}
+	if err := q.loadRelationships(testSingular, true); err != nil {
+		t.Error(err)
+	}
+
+	if !loadFunctionCalled {
+		t.Errorf("Load function was not called for singular")
+	}
+}
+
 func TestBind_InnerJoin(t *testing.T) {
 	t.Parallel()
 
@@ -352,6 +399,36 @@ func TestGetStructValues(t *testing.T) {
 	}
 }
 
+func TestGetSliceValues(t *testing.T) {
+	t.Parallel()
+
+	o := []struct {
+		ID   int
+		Name string
+	}{
+		{5, "a"},
+		{6, "b"},
+	}
+
+	in := make([]interface{}, len(o))
+	in[0] = o[0]
+	in[1] = o[1]
+
+	vals := GetSliceValues(in, "id", "name")
+	if got := vals[0].(int); got != 5 {
+		t.Error(got)
+	}
+	if got := vals[1].(string); got != "a" {
+		t.Error(got)
+	}
+	if got := vals[2].(int); got != 6 {
+		t.Error(got)
+	}
+	if got := vals[3].(string); got != "b" {
+		t.Error(got)
+	}
+}
+
 func TestGetStructPointers(t *testing.T) {
 	t.Parallel()
 

boil/testing.go

@@ -98,6 +98,11 @@ func (s *Seed) RandomizeStruct(str interface{}, colTypes map[string]string, canB
 			continue
 		}
 
+		tagVal, _ := getBoilTag(fieldTyp)
+		if tagVal == "-" {
+			continue
+		}
+
 		fieldDBType := colTypes[fieldTyp.Name]
 		if err := s.randomizeField(fieldVal, fieldDBType, canBeNull); err != nil {
 			return err

templates.go

@@ -157,4 +157,5 @@ var templateFunctions = template.FuncMap{
 	"sqlColDefinitions":      bdb.SQLColDefinitions,
 	"columnNames":            bdb.ColumnNames,
 	"columnDBTypes":          bdb.ColumnDBTypes,
+	"getTable":               bdb.GetTable,
 }

templates/00_struct.tpl

@@ -11,7 +11,7 @@ type {{$modelName}} struct {
   {{end -}}
   {{- if .Table.IsJoinTable -}}
   {{- else}}
-  //Relationships *{{$modelName}}Relationships `boil:"-" json:"-" toml:"-" yaml:"-"`
+  Relationships *{{$modelName}}Relationships `boil:"-" json:"-" toml:"-" yaml:"-"`
   {{end -}}
 }
 

templates/05_relationship_to_many.tpl

@@ -48,7 +48,7 @@ func ({{$rel.Function.Receiver}} *{{$rel.LocalTable.NameGo}}) {{$rel.Function.Na
 
     {{if .ToJoinTable -}}
   queryMods = append(queryMods,
-    qm.InnerJoin(`"{{.JoinTable}}" as "{{id 1}}" on "{{id 1}}"."{{.JoinForeignColumn}}" = "{{id 0}}"."{{.ForeignColumn}}"`),
+    qm.InnerJoin(`"{{.JoinTable}}" as "{{id 1}}" on "{{id 0}}"."{{.ForeignColumn}}" = "{{id 1}}"."{{.JoinForeignColumn}}"`),
     qm.Where(`"{{id 1}}"."{{.JoinLocalColumn}}"=$1`, {{.Column | titleCase | printf "%s.%s" $rel.Function.Receiver }}),
   )
     {{else -}}

templates/relationship_to_many_eager.tpl

@@ -0,0 +1,124 @@
+{{- if .Table.IsJoinTable -}}
+{{- else}}
+{{- $dot := . -}}
+{{- range .Table.ToManyRelationships -}}
+{{- if (and .ForeignColumnUnique (not .ToJoinTable)) -}}
+  {{- template "relationship_to_one_eager_helper" (textsFromOneToOneRelationship $dot.PkgName $dot.Tables $dot.Table .) -}}
+{{- else -}}
+  {{- $rel := textsFromRelationship $dot.Tables $dot.Table . -}}
+  {{- $arg := printf "maybe%s" $rel.LocalTable.NameGo -}}
+  {{- $slice := printf "%sSlice" $rel.LocalTable.NameGo}}
+// Load{{$rel.Function.Name}} allows an eager lookup of values, cached into the
+// relationships structs of the objects.
+func (r *{{$rel.LocalTable.NameGo}}Relationships) Load{{$rel.Function.Name}}(e boil.Executor, singular bool, {{$arg}} interface{}) error {
+  var slice []*{{$rel.LocalTable.NameGo}}
+  var object *{{$rel.LocalTable.NameGo}}
+
+  count := 1
+  if singular {
+    object = {{$arg}}.(*{{$rel.LocalTable.NameGo}})
+  } else {
+    slice = {{$arg}}.({{$slice}})
+    count = len(slice)
+  }
+
+  args := make([]interface{}, count)
+  if singular {
+    args[0] = object.{{.Column | titleCase}}
+  } else {
+    for i, obj := range slice {
+      args[i] = obj.{{.Column | titleCase}}
+    }
+  }
+
+    {{if .ToJoinTable -}}
+  query := fmt.Sprintf(
+    `select "{{id 0}}".*, "{{id 1}}"."{{.JoinLocalColumn}}" from "{{.ForeignTable}}" as "{{id 0}}" inner join "{{.JoinTable}}" as "{{id 1}}" on "{{id 0}}"."{{.ForeignColumn}}" = "{{id 1}}"."{{.JoinForeignColumn}}" where "{{id 1}}"."{{.JoinLocalColumn}}" in (%s)`,
+    strmangle.Placeholders(count, 1, 1),
+  )
+    {{else -}}
+  query := fmt.Sprintf(
+    `select * from "{{.ForeignTable}}" where "{{.ForeignColumn}}" in (%s)`,
+    strmangle.Placeholders(count, 1, 1),
+  )
+    {{end -}}
+
+  if boil.DebugMode {
+    fmt.Fprintf(boil.DebugWriter, "%s\n%v\n", query, args)
+  }
+
+  results, err := e.Query(query, args...)
+  if err != nil {
+    return errors.Wrap(err, "failed to eager load {{.ForeignTable}}")
+  }
+  defer results.Close()
+
+  var resultSlice []*{{$rel.ForeignTable.NameGo}}
+  {{if .ToJoinTable -}}
+  {{- $foreignTable := getTable $dot.Tables .ForeignTable -}}
+  {{- $joinTable := getTable $dot.Tables .JoinTable -}}
+  {{- $localCol := $joinTable.GetColumn .JoinLocalColumn}}
+  var localJoinCols []{{$localCol.Type}}
+  for results.Next() {
+    one := new({{$rel.ForeignTable.NameGo}})
+    var localJoinCol {{$localCol.Type}}
+
+    err = results.Scan({{$foreignTable.Columns | columnNames | stringMap $dot.StringFuncs.titleCase | prefixStringSlice "&one." | join ", "}}, &localJoinCol)
+    if err = results.Err(); err != nil {
+      return errors.Wrap(err, "failed to plebian-bind eager loaded slice {{.ForeignTable}}")
+    }
+
+    resultSlice = append(resultSlice, one)
+    localJoinCols = append(localJoinCols, localJoinCol)
+  }
+
+  if err = results.Err(); err != nil {
+    return errors.Wrap(err, "failed to plebian-bind eager loaded slice {{.ForeignTable}}")
+  }
+  {{else -}}
+  if err = boil.Bind(results, &resultSlice); err != nil {
+    return errors.Wrap(err, "failed to bind eager loaded slice {{.ForeignTable}}")
+  }
+  {{end}}
+
+  if singular {
+    if object.Relationships == nil {
+      object.Relationships = &{{$rel.LocalTable.NameGo}}Relationships{}
+    }
+    object.Relationships.{{$rel.Function.Name}} = resultSlice
+    return nil
+  }
+
+  {{if .ToJoinTable -}}
+  for i, foreign := range resultSlice {
+    localJoinCol := localJoinCols[i]
+    for _, local := range slice {
+      if local.{{$rel.Function.LocalAssignment}} == localJoinCol {
+        if local.Relationships == nil {
+          local.Relationships = &{{$rel.LocalTable.NameGo}}Relationships{}
+        }
+        local.Relationships.{{$rel.Function.Name}} = append(local.Relationships.{{$rel.Function.Name}}, foreign)
+        break
+      }
+    }
+  }
+  {{else -}}
+  for _, foreign := range resultSlice {
+    for _, local := range slice {
+      if local.{{$rel.Function.LocalAssignment}} == foreign.{{$rel.Function.ForeignAssignment}} {
+        if local.Relationships == nil {
+          local.Relationships = &{{$rel.LocalTable.NameGo}}Relationships{}
+        }
+        local.Relationships.{{$rel.Function.Name}} = append(local.Relationships.{{$rel.Function.Name}}, foreign)
+        break
+      }
+    }
+  }
+  {{end}}
+
+  return nil
+}
+
+{{end -}}{{/* if ForeignColumnUnique */}}
+{{- end -}}{{/* range tomany */}}
+{{- end -}}{{/* if isjointable */}}

templates/relationship_to_one_eager.tpl

@@ -0,0 +1,77 @@
+{{- define "relationship_to_one_eager_helper" -}}
+  {{- $arg := printf "maybe%s" .LocalTable.NameGo -}}
+  {{- $slice := printf "%sSlice" .LocalTable.NameGo}}
+// Load{{.Function.Name}} allows an eager lookup of values, cached into the
+// relationships structs of the objects.
+func (r *{{.LocalTable.NameGo}}Relationships) Load{{.Function.Name}}(e boil.Executor, singular bool, {{$arg}} interface{}) error {
+  var slice []*{{.LocalTable.NameGo}}
+  var object *{{.LocalTable.NameGo}}
+
+  count := 1
+  if singular {
+    object = {{$arg}}.(*{{.LocalTable.NameGo}})
+  } else {
+    slice = {{$arg}}.({{$slice}})
+    count = len(slice)
+  }
+
+  args := make([]interface{}, count)
+  if singular {
+    args[0] = object.{{.LocalTable.ColumnNameGo}}
+  } else {
+    for i, obj := range slice {
+      args[i] = obj.{{.LocalTable.ColumnNameGo}}
+    }
+  }
+
+  query := fmt.Sprintf(
+    `select * from "{{.ForeignKey.ForeignTable}}" where "{{.ForeignKey.ForeignColumn}}" in (%s)`,
+    strmangle.Placeholders(count, 1, 1),
+  )
+
+  if boil.DebugMode {
+    fmt.Fprintf(boil.DebugWriter, "%s\n%v\n", query, args)
+  }
+
+  results, err := e.Query(query, args...)
+  if err != nil {
+    return errors.Wrap(err, "failed to eager load {{.ForeignTable.NameGo}}")
+  }
+  defer results.Close()
+
+  var resultSlice []*{{.ForeignTable.NameGo}}
+  if err = boil.Bind(results, &resultSlice); err != nil {
+    return errors.Wrap(err, "failed to bind eager loaded slice {{.ForeignTable}}")
+  }
+
+  if singular && len(resultSlice) != 0 {
+    if object.Relationships == nil {
+      object.Relationships = &{{.LocalTable.NameGo}}Relationships{}
+    }
+    object.Relationships.{{.Function.Name}} = resultSlice[0]
+    return nil
+  }
+
+  for _, foreign := range resultSlice {
+    for _, local := range slice {
+      if local.{{.Function.LocalAssignment}} == foreign.{{.Function.ForeignAssignment}} {
+        if local.Relationships == nil {
+          local.Relationships = &{{.LocalTable.NameGo}}Relationships{}
+        }
+        local.Relationships.{{.Function.Name}} = foreign
+        break
+      }
+    }
+  }
+
+  return nil
+}
+{{- end -}}
+{{- if .Table.IsJoinTable -}}
+{{- else -}}
+  {{- $dot := . -}}
+  {{- range .Table.FKeys -}}
+    {{- $rel := textsFromForeignKey $dot.PkgName $dot.Tables $dot.Table . -}}
+{{- template "relationship_to_one_eager_helper" $rel -}}
+{{end -}}
+{{- end -}}

templates_test/relationship_to_many.tpl

@@ -74,6 +74,21 @@ func test{{$rel.LocalTable.NameGo}}ToMany{{$rel.Function.Name}}(t *testing.T) {
     t.Error("expected to find c")
   }
 
+  if err = a.Relationships.Load{{$rel.Function.Name}}(tx, false, {{$rel.LocalTable.NameGo}}Slice{&a}); err != nil {
+    t.Fatal(err)
+  }
+  if got := len(a.Relationships.{{$rel.Function.Name}}); got != 2 {
+    t.Error("number of eager loaded records wrong, got:", got)
+  }
+
+  a.Relationships.{{$rel.Function.Name}} = nil
+  if err = a.Relationships.Load{{$rel.Function.Name}}(tx, true, &a); err != nil {
+    t.Fatal(err)
+  }
+  if got := len(a.Relationships.{{$rel.Function.Name}}); got != 2 {
+    t.Error("number of eager loaded records wrong, got:", got)
+  }
+
   if t.Failed() {
     t.Logf("%#v", {{$varname}})
   }

templates_test/relationship_to_one.tpl

@@ -40,6 +40,21 @@ func test{{.LocalTable.NameGo}}ToOne{{.ForeignTable.NameGo}}_{{.Function.Name}}(
   if check.{{.Function.ForeignAssignment}} != foreign.{{.Function.ForeignAssignment}} {
     t.Errorf("want: %v, got %v", foreign.{{.Function.ForeignAssignment}}, check.{{.Function.ForeignAssignment}})
   }
+
+  if err = local.Relationships.Load{{.Function.Name}}(tx, false, {{.LocalTable.NameGo}}Slice{&local}); err != nil {
+    t.Fatal(err)
+  }
+  if local.Relationships.{{.Function.Name}} == nil {
+    t.Error("struct should have been eager loaded")
+  }
+
+  local.Relationships.{{.Function.Name}} = nil
+  if err = local.Relationships.Load{{.Function.Name}}(tx, true, &local); err != nil {
+    t.Fatal(err)
+  }
+  if local.Relationships.{{.Function.Name}} == nil {
+    t.Error("struct should have been eager loaded")
+  }
 }
 
 {{end -}}

templates_test/singleton/boil_test_suite.tpl

@@ -136,9 +136,9 @@ func TestInsert(t *testing.T) {
   {{- end -}}
 }
 
-// The relationship tests cannot be run in parallel
+// TestToMany tests cannot be run in parallel
 // or postgres deadlocks will occur.
-func TestRelationships(t *testing.T) {
+func TestToMany(t *testing.T) {
   {{- $dot := .}}
   {{- range $index, $table := .Tables}}
     {{- $tableName := $table.Name | plural | titleCase -}}
@@ -147,16 +147,31 @@ func TestRelationships(t *testing.T) {
       {{- range $table.ToManyRelationships -}}
         {{- $rel := textsFromRelationship $dot.Tables $table . -}}
         {{- if (and .ForeignColumnUnique (not .ToJoinTable)) -}}
-          {{- $funcName := $rel.LocalTable.NameGo -}}
-  t.Run("{{$rel.ForeignTable.NameGo}}ToOne", test{{$rel.ForeignTable.NameGo}}ToOne{{$rel.LocalTable.NameGo}}_{{$funcName}})
+          {{- $oneToOne := textsFromOneToOneRelationship $dot.PkgName $dot.Tables $table . -}}
+  t.Run("{{$oneToOne.LocalTable.NameGo}}OneToOne{{$oneToOne.ForeignTable.NameGo}}_{{$oneToOne.Function.Name}}", test{{$oneToOne.LocalTable.NameGo}}ToOne{{$oneToOne.ForeignTable.NameGo}}_{{$oneToOne.Function.Name}})
         {{else -}}
-  t.Run("{{$rel.LocalTable.NameGo}}ToMany", test{{$rel.LocalTable.NameGo}}ToMany{{$rel.Function.Name}})
+  t.Run("{{$rel.LocalTable.NameGo}}ToMany{{$rel.Function.Name}}", test{{$rel.LocalTable.NameGo}}ToMany{{$rel.Function.Name}})
         {{end -}}{{- /* if unique */ -}}
       {{- end -}}{{- /* range */ -}}
     {{- end -}}{{- /* outer if join table */ -}}
   {{- end -}}{{- /* outer tables range */ -}}
 }
 
+// TestToOne tests cannot be run in parallel
+// or postgres deadlocks will occur.
+func TestToOne(t *testing.T) {
+  {{- $dot := . -}}
+{{- range $index, $table := .Tables}}
+  {{- if $table.IsJoinTable -}}
+  {{- else -}}
+    {{- range $table.FKeys -}}
+      {{- $rel := textsFromForeignKey $dot.PkgName $dot.Tables $table . -}}
+  t.Run("{{$rel.LocalTable.NameGo}}To{{$rel.ForeignTable.NameGo}}_{{$rel.Function.Name}}", test{{$rel.LocalTable.NameGo}}ToOne{{$rel.ForeignTable.NameGo}}_{{$rel.Function.Name}})
+    {{end -}}{{- /* fkey range */ -}}
+  {{- end -}}{{- /* if join table */ -}}
+{{- end -}}{{- /* tables range */ -}}
+}
+
 func TestReload(t *testing.T) {
   {{- range $index, $table := .Tables}}
   {{- if $table.IsJoinTable -}}