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seedr.go
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seedr.go
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// Package seedr is inspired by Ruby's factory_girl.
// It's a fixtures replacement that allows to
// define factories and build/store objects
// in expressive and flexible way.
package seedr
import (
"database/sql"
"fmt"
"reflect"
"regexp"
"strings"
"time"
"github.com/josephbuchma/seedr/driver"
"github.com/josephbuchma/seedr/driver/noop"
)
const (
// Include is a special key for Trait definition
// that defines on what traits current trait is based on.
// Value must be a string with names of traits (of current factory only)
// separated by whitespace.
Include = "SEEDR_INCLUDE_TRAITS"
)
// Trait contains factory fields definitions.
// Key is a field name and value is any of supported:
// - any numeric type
// - time.Time
// - sql.Scanner
// - Generator
// - nil (interface{}(nil))
// Special key is `Include` constant
// that defines on what traits this Trait is based on.
// Every field of trait is a name of respective field
// in database.
type Trait map[string]interface{}
var traitNameRegexp = regexp.MustCompile(`\w+`)
// includes returns list of traits to include
func (t Trait) includes() []string {
if _, ok := t[Include]; !ok {
return nil
}
return traitNameRegexp.FindAllString(t[Include].(string), -1)
}
// merge adds new keys from given trait
func (t Trait) merge(trait Trait, override bool) Trait {
for field, val := range trait {
if field == Include {
continue
}
if override {
t[field] = val
} else if _, ok := t[field]; !ok {
t[field] = val
}
}
return t
}
// getFieldValue bypasses given value if it's of supported type
// or returns .Next() if it's a Generator
// otherwise it panics
func getFieldValue(v interface{}) (interface{}, error) {
if v == nil {
return nil, nil
}
switch v := v.(type) {
case int, uint, int8, uint8, int16,
uint16, int32, uint32, int64, uint64,
float32, float64, string, []byte, bool,
time.Time, sql.Scanner, auto, *relationField, dependentField:
return v, nil
case Generator:
return getFieldValue(v.Next())
}
return nil, fmt.Errorf("`%v` is of unsupported type %T", v, v)
}
// FactoryConfig ...
type FactoryConfig struct {
factoryName string
// Entity is a name of database schema/table, index, etc.
// Entity may not be required, depends on driver.
// If not given, factory name is used.
Entity string
// PrimaryKey is a name of primary key field.
// It is required if you define any relations.
// It also may be required by your Driver.
PrimaryKey string
}
func (fc FactoryConfig) mustPK() string {
if fc.PrimaryKey == "" {
panicf("PrimaryKey for %s is not defined", fc.Entity)
}
return fc.PrimaryKey
}
// Factory is a container for factory definition
type Factory struct {
FactoryConfig
Relations
Traits
}
// Traits is a map of Trait declarations (name -> Trait).
// Capitalized names are 'exported', others are private (e.g. only can be included by other Trait of this Traits).
type Traits map[string]Trait
// mergeIncludes recursively merge all includes of given trait.
// It panics on circular import.
func (t Traits) mergeIncludes(trait Trait, traitName string) Trait {
ret := Trait{}
for _, incl := range trait.includes() {
if tr, ok := t[incl]; ok {
if strings.Contains(toString(tr[Include]), traitName) {
panicf("Circular include %q <-> %q", traitName, incl)
}
ret.merge(t.mergeIncludes(tr, incl), true)
} else {
panicf("Invalid include in %q: trait %q does not exist", traitName, incl)
}
}
return ret.merge(trait, true)
}
// build merge all includes and returns list of public trait names
func (t Traits) buildPublics() []string {
var publics []string
for name, trait := range t {
if strings.ToUpper(name[0:1]) == name[0:1] {
t[name] = t.mergeIncludes(trait, name)
publics = append(publics, name)
}
}
return publics
}
// ConfigFunc is used to configure Seedr
type ConfigFunc func(*Seedr)
// SetCreateDriver sets driver for `Create*` methods
func SetCreateDriver(b driver.Driver) ConfigFunc {
if b == nil {
panic("driver can't be nil")
}
return func(s *Seedr) {
s.createDriver = b
}
}
// SetBuildDriver sets driver for `Build*` methods
func SetBuildDriver(b driver.Driver) ConfigFunc {
if b == nil {
panic("driver can't be nil")
}
return func(s *Seedr) {
s.buildDriver = b
}
}
// MapFieldFunc returns name of Trait's field based on StructField
type MapFieldFunc func(reflect.StructField) (traitFieldName string, err error)
// SnakeFieldMapper converts field name to snake case;
// acronyms are converted to lower-case and preceded by an underscore.
// Note that multiple consequent acronyms will be considered a single acronym
// (e.g. ACDCTime will become acdc_time, not ac_dc_time)
func SnakeFieldMapper() MapFieldFunc {
return func(f reflect.StructField) (string, error) {
return toSnake(f.Name), nil
}
}
// NoopFieldMapper returns field's `Name` without changes
func NoopFieldMapper() MapFieldFunc {
return func(f reflect.StructField) (string, error) {
return f.Name, nil
}
}
// TagFieldMapper looks for specific struct field tag or uses fallback mapper if tag is not found.
func TagFieldMapper(tag string, fallback MapFieldFunc) MapFieldFunc {
return func(f reflect.StructField) (string, error) {
v := f.Tag.Get(tag)
if v != "" {
return strings.Split(v, ",")[0], nil
}
if fallback != nil {
return fallback(f)
}
return "", fmt.Errorf("TagFieldMapper failed on struct field %#v", f)
}
}
// RegexpTagFieldMapper applies regex to whole struct tag string and uses first
// match as result. If it fails fallback mapper is used.
func RegexpTagFieldMapper(regex string, fallback MapFieldFunc) MapFieldFunc {
cmpRegex := regexp.MustCompile(regex)
return func(f reflect.StructField) (string, error) {
name := cmpRegex.FindStringSubmatch(string(f.Tag))
if len(name) != 0 {
return name[1], nil
}
if fallback != nil {
return fallback(f)
}
return "", fmt.Errorf("TagFieldMapper failed on struct field %#v", f)
}
}
// SetFieldMapper sets MapFieldFunc func for Seedr
func SetFieldMapper(f MapFieldFunc) ConfigFunc {
if f == nil {
panic("name field mapper can't be nil")
}
return func(s *Seedr) {
s.extractFieldName = f
}
}
// Seedr is a collection of factories.
type Seedr struct {
name string
// createDriver is used in Create* methods
createDriver driver.Driver
// buildDriver is used in Build* methods
buildDriver driver.Driver
// publicTraits contains map with all traits that starts with capital letter
publicTraits map[string]*publicTrait
extractFieldName MapFieldFunc
}
// New creates Seedr instance with NoopFieldMapper
// and NoopDriver for create and build methods by default.
func New(name string, config ...ConfigFunc) *Seedr {
sdr := &Seedr{
name: validString(name, "Seedr name can't be empty string"),
publicTraits: make(map[string]*publicTrait),
extractFieldName: NoopFieldMapper(),
createDriver: noop.NoopDriver{},
buildDriver: noop.NoopDriver{},
}
for _, cfg := range config {
cfg(sdr)
}
return sdr
}
// Add adds new factory to this seedr
func (sdr *Seedr) Add(factoryName string, f Factory) *Seedr {
f.FactoryConfig.factoryName = factoryName
if f.FactoryConfig.Entity == "" {
f.FactoryConfig.Entity = factoryName
}
relations := f.Relations.normalize()
t := f.Traits
for _, name := range t.buildPublics() {
trait := t[name]
if _, exist := sdr.publicTraits[name]; exist {
panicf("Public trait with name %q already exists", name)
}
extRelCnt := 0
for _, rel := range relations {
for f := range trait {
if rel.kind != relationParent && relations[f] != nil {
extRelCnt++
}
}
}
pub := &publicTrait{
sdr: sdr,
factory: &f,
name: name,
trait: trait,
relations: relations,
externalRelationsCnt: extRelCnt,
}
pub.normalizeRelations()
sdr.publicTraits[name] = pub
}
return sdr
}
func (sdr *Seedr) getPublicTrait(name string) *publicTrait {
t, ok := sdr.publicTraits[name]
if !ok {
panicf("Trait %q does not exist", name)
}
return t
}
type rawTrait struct {
trait *publicTrait
rels map[string]*relationField
data []map[string]interface{}
dependent map[string]dependentField
insertFields, returnFields []string
iter int
}
func (it *rawTrait) addRel(field string, dep *relationField) {
if it.rels == nil {
it.rels = make(map[string]*relationField)
}
it.rels[field] = dep
}
type publicTrait struct {
sdr *Seedr
factory *Factory
name string
trait Trait
relations map[string]*Relation
externalRelationsCnt int
}
func (t *publicTrait) normalizeRelations() {
for relName, rel := range t.relations {
if rel.kind == relationParent {
if t.trait[relName] != nil {
delete(t.trait, rel.lfield)
}
}
}
}
func (t *publicTrait) next(n int, ovr Trait) *rawTrait {
depsReady := false
rt := &rawTrait{
trait: t,
data: make([]map[string]interface{}, 0, n),
dependent: make(map[string]dependentField),
}
for i := 0; i < n; i++ {
nxt := make(Trait)
for i, trait := range []Trait{t.trait, ovr} {
for k, v := range trait {
if ovr != nil {
if ov, ok := ovr[k]; ok {
if i == 0 {
v = ov
} else if _, ok := t.trait[k]; ok {
continue
}
}
}
fv, err := getFieldValue(v)
if err != nil {
panicf("Failed to get value of field %q: %s", k, err)
}
switch fv := fv.(type) {
case *relationField, auto:
case dependentField:
rt.dependent[k] = fv
default:
nxt[k] = fv
}
if depsReady {
continue
}
switch v := fv.(type) {
case *relationField:
if v.lfield == "" {
if rel, ok := t.relations[k]; ok {
if _, ok := t.sdr.publicTraits[v.traitName]; !ok {
panicf("Trait %q does not exist (trait %q, field %q)", v.traitName, t.name, k)
}
v.kind = rel.kind
v.rfield = rel.rfield
v.lfield = rel.lfield
} else {
panicf("Relation %s is not defined for trait %s", k, t.name)
}
}
rt.addRel(k, v)
if v.kind == relationParent {
rt.insertFields = append(rt.insertFields, v.lfield)
}
case auto:
rt.returnFields = append(rt.returnFields, k)
default:
rt.insertFields = append(rt.insertFields, k)
}
}
}
depsReady = true
rt.data = append(rt.data, nxt)
}
rt.returnFields = append(rt.insertFields, rt.returnFields...)
return rt
}
func (t *publicTrait) build(ovr Trait, n int) (ret *TraitInstances) {
return t.drvCreate(ovr, n, t.sdr.buildDriver)
}
func (t *publicTrait) create(ovr Trait, n int) (ret *TraitInstances) {
return t.drvCreate(ovr, n, t.sdr.createDriver)
}
func (t *publicTrait) drvCreate(ovr Trait, n int, drv driver.Driver) (ret *TraitInstances) {
ret = &TraitInstances{sdr: t.sdr, trait: t, childs: make(map[string][]*TraitInstances)}
rt := t.next(n, ovr)
if rt.rels != nil {
ret.parents = make(map[string]*TraitInstances)
childs := make(map[string]*relationField)
m2ms := make(map[string]*relationField)
// handle child and many to many relations after this one is created
defer func() {
if len(childs) == 0 && len(m2ms) == 0 {
return
}
pks := make([]interface{}, len(ret.data))
pkName := t.factory.FactoryConfig.mustPK()
for i, r := range ret.data {
pks[i] = r[pkName]
}
for field, rel := range childs {
ins := t.sdr.getPublicTrait(rel.traitName).create((Trait{
rel.lfield: mnSliceSeq(pks, rel.n),
}).merge(rel.override, false), len(rt.data)*rel.n)
ret.childs[field] = ins.chop(n)
}
for field, rel := range m2ms {
rels := t.sdr.getPublicTrait(rel.traitName).create(rel.override, len(rt.data)*rel.n)
relpks := make([]interface{}, rels.Len())
for i, r := range rels.data {
relpks[i] = r[pkName]
}
joinTraitName := t.relations[field].joinTrait
// TODO: relate join table
t.sdr.getPublicTrait(joinTraitName).create(Trait{
rel.lfield: mnSliceSeq(pks, rel.n),
rel.rfield: mnSliceSeq(relpks, rel.n),
}, len(rt.data)*rel.n)
ret.childs[field] = rels.chop(n)
}
}()
for field, rel := range rt.rels {
switch rel.kind {
case relationParent:
ins := t.sdr.getPublicTrait(rel.traitName).create(rel.override, len(rt.data))
ret.parents[field] = ins
case relationChild:
childs[field] = rel
case relationM2M:
m2ms[field] = rel
}
}
if len(ret.parents) > 0 {
for i, d := range rt.data {
for relation, rel := range rt.rels {
if rel.kind != relationParent {
continue
}
p := ret.parents[relation]
d[rel.lfield] = p.data[i][p.trait.factory.FactoryConfig.mustPK()]
}
}
}
}
if len(rt.dependent) > 0 {
for _, ti := range rt.data {
resolveDependentFields(ti, rt.dependent)
}
}
var err error
ret.data, err = drv.Create(driver.Payload{
Entity: t.factory.FactoryConfig.Entity,
PrimaryKey: t.factory.FactoryConfig.PrimaryKey,
InsertFields: rt.insertFields,
ReturnFields: rt.returnFields,
Data: rt.data,
})
if err != nil {
panicf("Seedr Driver error: %s", err)
}
return ret
}
func resolveDependentField(f string, ti map[string]interface{}, dep map[string]dependentField,
resolved map[string]bool, stack []string) {
if len(stack) > 0 {
for i := len(stack) - 1; i >= 0; i-- {
if stack[i] == f {
circle := strings.Join(append(stack[i:], f), " -> ")
panicf("Circular field dependency: %s", circle)
}
}
}
stack = append(stack, f)
d := dep[f]
for _, df := range d.fields {
if _, ok := dep[df]; ok && !resolved[df] {
resolveDependentField(df, ti, dep, resolved, stack)
}
}
ti[f] = d.do(ti)
stack = stack[0 : len(stack)-1]
}
func resolveDependentFields(ti map[string]interface{}, dep map[string]dependentField) {
resolved := map[string]bool{}
stack := []string{}
for f := range dep {
resolveDependentField(f, ti, dep, resolved, stack)
}
}
// TraitInstance is a created trait instance
type TraitInstance struct {
sdr *Seedr
insts *TraitInstances
i int
}
// createRelated creates related traits. Works for child and M2M relations.
func (ti TraitInstance) createRelated(relation, traitName string, n int, override Trait) TraitInstance {
var ins *TraitInstances
rel, ok := ti.insts.trait.relations[relation]
if !ok {
panicf("%q does not have relation %q", ti.insts.trait.factory.FactoryConfig.factoryName, relation)
}
switch rel.kind {
case relationChild:
ovr := Trait{
rel.lfield: ti.insts.data[ti.i][ti.insts.trait.factory.FactoryConfig.mustPK()],
}
if override != nil {
ovr = override.merge(ovr, true)
}
ins = ti.sdr.CreateCustomBatch(traitName, n, ovr)
case relationM2M:
if nm := ti.sdr.getPublicTrait(traitName).factory.FactoryConfig.factoryName; nm != rel.factory {
panicf("Invalid M2M: expected factory %s, got %s", rel.factory, nm)
}
ins = ti.sdr.CreateCustomBatch(traitName, n, override)
// TODO: bind 'parent' rel to both
ti.sdr.CreateCustomBatch(rel.joinTrait, n, Trait{
rel.lfield: ti.insts.data[0][ti.insts.trait.factory.FactoryConfig.mustPK()],
rel.rfield: SequenceFunc(func(i int) interface{} {
return ins.data[i][ins.trait.factory.FactoryConfig.mustPK()]
}, 0),
})
case relationParent:
panicf("TraitInstance#CreateRelated does not support 'parent' relations. Please use 'Seedr#CreateCustom' or define trait in factory")
default:
panic("UNREACHABLE")
}
if recs, ok := ti.insts.childs[relation]; ok && len(recs) > ti.i {
recs[ti.i].append(ins)
} else if !ok {
ti.insts.childs[relation] = []*TraitInstances{ins}
} else if len(recs) == ti.i {
ti.insts.childs[relation] = append(ti.insts.childs[relation], ins)
} else {
panic("NOOP")
}
return ti
}
// CreateRelated creates single related instance. Works for FK (child only) and M2M.
// It returns original TraitInstance, not one that was created. Fetch created one using Related method.
func (ti TraitInstance) CreateRelated(relation, traitName string) TraitInstance {
return ti.createRelated(relation, traitName, 1, nil)
}
// CreateRelatedCustom creates single related instance with additional changes. Works for FK (child only) and M2M
// It returns original TraitInstance, not one that was created. Fetch created one using Related method.
func (ti TraitInstance) CreateRelatedCustom(relation, traitName string, overrides Trait) TraitInstance {
return ti.createRelated(relation, traitName, 1, overrides)
}
// CreateRelatedBatch creates n related instances. Works for FK (child only) and M2M
// It returns original TraitInstance, not one that was created. Fetch created one using Related method.
func (ti TraitInstance) CreateRelatedBatch(relation, traitName string, n int) TraitInstance {
return ti.createRelated(relation, traitName, n, nil)
}
// CreateRelatedCustomBatch creates n related instances with additional changes. Works for FK (child only) and M2M
// It returns original TraitInstance, not one that was created. Fetch created one using Related method.
func (ti TraitInstance) CreateRelatedCustomBatch(relation, traitName string, n int, overrides Trait) TraitInstance {
return ti.createRelated(relation, traitName, n, overrides)
}
// Scan initializes given struct instance `v` by TraitInstance's values.
// `v` must be a pointer to struct.
func (ti TraitInstance) Scan(v interface{}) TraitInstance {
val := reflect.ValueOf(v).Elem()
t := val.Type()
rec := ti.insts.data[ti.i]
scannedCnt := 0
for i := 0; i < t.NumField(); i++ {
f := t.Field(i)
fname, err := ti.sdr.extractFieldName(f)
if err != nil {
panicf("Failed to Scan: %s", err)
}
if iv, ok := rec[fname]; !ok {
continue
} else {
if err := convertAssign(val.Field(i).Addr().Interface(), iv); err != nil {
panic(err)
}
scannedCnt++
}
}
if len(rec) < scannedCnt {
panicf("Could not scan some values from this object: %#v", ti.insts.data[ti.i])
}
return ti
}
// ScanRelated scans related TraitInstance(s) into v and returns this TraitInstance.
func (ti TraitInstance) ScanRelated(relationName string, v interface{}) TraitInstance {
ti.Related(relationName).Scan(v)
return ti
}
// parent returns parent TraitInstance by given FIELD (FK) name.
func (ti TraitInstance) parent(field string) *TraitInstances {
parents, ok := ti.insts.parents[field]
if !ok {
return nil
}
return parents.slice(ti.i, ti.i+1)
//return &TraitInstance{sdr: ti.sdr, insts: parents, i: ti.i}
}
// child returns child TraitInstances by given relation name
func (ti TraitInstance) child(relationName string) *TraitInstances {
childs, ok := ti.insts.childs[relationName]
if !ok {
return nil
}
return childs[ti.i]
}
// Related returns related TraitInstances (that was created by CreateRelated*)
func (ti TraitInstance) Related(relationName string) *TraitInstances {
rels := ti.child(relationName)
if rels == nil {
rels = ti.parent(relationName)
}
if rels == nil {
panicf("%q factory has no relation %q", ti.insts.trait.factory.factoryName, relationName)
}
return rels
}
// TraitInstances is a collection of created trait instances
type TraitInstances struct {
sdr *Seedr
trait *publicTrait
// recs is a list of raw inserted records
data []map[string]interface{}
// parents is field -> relation[i] for recs[i]
parents map[string]*TraitInstances
// childs is field -> list of childs where list[i] belogs to data[i]
childs map[string][]*TraitInstances
}
func (ti *TraitInstances) append(r *TraitInstances) {
for _, rec := range r.data {
ti.data = append(ti.data, rec)
}
for fld, recs := range r.parents {
ti.parents[fld].append(recs)
}
for fld, lst := range r.childs {
for _, recs := range lst {
ti.childs[fld] = append(ti.childs[fld], recs)
}
}
}
func (ti *TraitInstances) slice(b, e int) *TraitInstances {
ret := &TraitInstances{
sdr: ti.sdr,
trait: ti.trait,
// recs is a list of raw inserted records
data: ti.data[b:e],
parents: make(map[string]*TraitInstances),
}
for k, v := range ti.parents {
ret.parents[k] = v.slice(b, e)
}
if len(ti.childs) > 0 {
ret.childs = make(map[string][]*TraitInstances)
for f, ch := range ti.childs {
ret.childs[f] = ch[b:e]
}
}
return ret
}
func (ti *TraitInstances) chop(n int) []*TraitInstances {
if len(ti.data)%n != 0 {
panic("Can't chop")
}
ret := make([]*TraitInstances, n)
chunk := len(ti.data) / n
for i := 0; i < n; i++ {
ret[i] = ti.slice(i*chunk, i*chunk+chunk)
}
return ret
}
// Len returns total count of trait instances in this collection
func (ti *TraitInstances) Len() int {
return len(ti.data)
}
// Index returns TraitInstance by index
func (ti *TraitInstances) Index(index int) TraitInstance {
return TraitInstance{sdr: ti.sdr, i: index, insts: ti}
}
// ScanRelated is a shortcut for #Index(0).ScanRelated()
// It panics if there is not exactly one instance in this TraitInstances.
func (ti *TraitInstances) ScanRelated(relationName string, dest interface{}) {
switch ti.Len() {
case 0:
panic("Nothing to Scan")
case 1:
ti.Index(0).ScanRelated(relationName, dest)
default:
panic("calling ScanRelated when there is more than one instance is not allowed")
}
}
// Scan initializes given list of struct instances `dest` by TraitInstance's values.
// `v` must be a pointer to slice of structs.
// But, if there is only one instance, dest can be pointer to struct.
func (ti *TraitInstances) Scan(dest interface{}) (ret *TraitInstances) {
if ti.Len() == 0 {
panic("Nothing to Scan")
}
v := reflect.ValueOf(dest)
t := v.Type()
if t.Kind() != reflect.Ptr {
panicf("Scan works only with pointers, %s was given.", t.Kind())
}
if ti.Len() == 1 {
if t.Elem().Kind() == reflect.Struct {
ti.Index(0).Scan(dest)
return ti
}
}
if t.Kind() != reflect.Ptr || t.Elem().Kind() != reflect.Slice {
panicf("InsertedRecords#Scan argument must be pointer to slice")
}
t = t.Elem().Elem()
sls := reflect.MakeSlice(reflect.SliceOf(t), len(ti.data), len(ti.data))
v.Elem().Set(sls)
var tPtr reflect.Type
if t.Kind() == reflect.Ptr {
tPtr = t
t = t.Elem()
}
for i := 0; i < len(ti.data); i++ {
vi := sls.Index(i)
val := vi
if tPtr != nil {
val = reflect.Zero(t)
vi.Set(val.Addr())
}
scannedCnt := 0
for fid := 0; fid < t.NumField(); fid++ {
f := t.Field(fid)
fname, err := ti.sdr.extractFieldName(f)
if err != nil {
panicf("Failed to Scan: %s", err)
}
if iv, ok := ti.data[i][fname]; !ok {
continue
} else {
if err := convertAssign(val.Field(fid).Addr().Interface(), iv); err != nil {
panic(err)
}
scannedCnt++
}
}
if len(ti.data[i]) < scannedCnt {
panicf("Could not scan some values: %#v", ti.data[i])
}
}
return ti
}
// CreateCustom overrides values of trait definition and creates resulting trait.
// It uses "create" driver (see SetCreateDriver)
func (sdr *Seedr) CreateCustom(traitName string, override Trait) TraitInstance {
t := sdr.getPublicTrait(traitName)
ins := t.create(override, 1)
return ins.Index(0)
}
// CreateCustomBatch overrides values of trait definition
// and creates n instances of resulting trait.
// It uses "create" driver (see SetCreateDriver)
func (sdr *Seedr) CreateCustomBatch(traitName string, n int, override Trait) *TraitInstances {
t := sdr.getPublicTrait(traitName)
return t.create(override, n)
}
// CreateBatch creates n instances of trait
// It uses "create" driver (see SetCreateDriver)
func (sdr *Seedr) CreateBatch(traitName string, n int) *TraitInstances {
t := sdr.getPublicTrait(traitName)
return t.create(nil, n)
}
// Create creates an instance of trait
// It uses "create" driver (see SetCreateDriver)
func (sdr *Seedr) Create(traitName string) TraitInstance {
t := sdr.getPublicTrait(traitName)
ins := t.create(nil, 1)
return ins.Index(0)
}
// BuildCustom builds trait with additional changes.
// It uses "build" driver (see SetBuildDriver)
func (sdr *Seedr) BuildCustom(traitName string, override Trait) TraitInstance {
t := sdr.getPublicTrait(traitName)
ins := t.build(override, 1)
return ins.Index(0)
}
// BuildCustomBatch builds n trait instances with additional changes.
// It uses "build" driver (see SetBuildDriver)
func (sdr *Seedr) BuildCustomBatch(traitName string, n int, override Trait) *TraitInstances {
t := sdr.getPublicTrait(traitName)
return t.build(override, n)
}
// BuildBatch builds n trait instances.
// It uses "build" driver (see SetBuildDriver)
func (sdr *Seedr) BuildBatch(traitName string, n int) *TraitInstances {
t := sdr.getPublicTrait(traitName)
return t.build(nil, n)
}
// Build builds trait.
// It uses "build" driver (see SetBuildDriver)
func (sdr *Seedr) Build(traitName string) TraitInstance {
t := sdr.getPublicTrait(traitName)
ins := t.build(nil, 1)
return ins.Index(0)
}