forked from goadesign/gorma
/
relationalmodel.go
197 lines (176 loc) · 4.98 KB
/
relationalmodel.go
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package gorma
import (
"fmt"
"sort"
"strings"
"github.com/goadesign/goa/design"
"github.com/goadesign/goa/dslengine"
"github.com/goadesign/goa/goagen/codegen"
)
// Context returns the generic definition name used in error messages.
func (f *RelationalModelDefinition) Context() string {
if f.Name != "" {
return fmt.Sprintf("RelationalModel %#v", f.Name)
}
return "unnamed RelationalModel"
}
// DSL returns this object's DSL.
func (f *RelationalModelDefinition) DSL() func() {
return f.DefinitionDSL
}
// Children returns a slice of this objects children.
func (f RelationalModelDefinition) Children() []dslengine.Definition {
var stores []dslengine.Definition
for _, s := range f.RelationalFields {
stores = append(stores, s)
}
return stores
}
// PKAttributes constructs a pair of field + definition strings
// useful for method parameters.
func (f *RelationalModelDefinition) PKAttributes() string {
var attr []string
for _, pk := range f.PrimaryKeys {
attr = append(attr, fmt.Sprintf("%s %s", pk.DatabaseFieldName, goDatatype(pk)))
}
return strings.Join(attr, ",")
}
// PKWhere returns an array of strings representing the where clause
// of a retrieval by primary key(s) -- x = ? and y = ?.
func (f *RelationalModelDefinition) PKWhere() string {
var pkwhere []string
for _, pk := range f.PrimaryKeys {
def := fmt.Sprintf("%s = ?", pk.DatabaseFieldName)
pkwhere = append(pkwhere, def)
}
return strings.Join(pkwhere, " and ")
}
// PKWhereFields returns the fields for a where clause for the primary
// keys of a model.
func (f *RelationalModelDefinition) PKWhereFields() string {
var pkwhere []string
for _, pk := range f.PrimaryKeys {
def := fmt.Sprintf("%s", pk.DatabaseFieldName)
pkwhere = append(pkwhere, def)
}
return strings.Join(pkwhere, ",")
}
// PKUpdateFields returns something? This function doesn't look useful in
// current form. Perhaps it isn't.
func (f *RelationalModelDefinition) PKUpdateFields(modelname string) string {
var pkwhere []string
for _, pk := range f.PrimaryKeys {
def := fmt.Sprintf("%s.%s", modelname, codegen.Goify(pk.Name, true))
pkwhere = append(pkwhere, def)
}
pkw := strings.Join(pkwhere, ",")
return pkw
}
// StructDefinition returns the struct definition for the model.
func (f *RelationalModelDefinition) StructDefinition() string {
header := fmt.Sprintf("type %s struct {\n", f.Name)
var output string
f.IterateFields(func(field *RelationalFieldDefinition) error {
output = output + field.FieldDefinition()
return nil
})
footer := "}\n"
return header + output + footer
}
// LowerName returns the model name as a lowercase string.
func (f *RelationalModelDefinition) LowerName() string {
return strings.ToLower(f.Name)
}
// IterateFields returns an iterator function useful for iterating through
// this model's field list.
func (f *RelationalModelDefinition) IterateFields(it FieldIterator) error {
// Break out each type of fields
pks := make(map[string]string)
for n := range f.RelationalFields {
if f.RelationalFields[n].PrimaryKey {
// names[i] = n
pks[n] = n
}
}
names := make(map[string]string)
for n := range f.RelationalFields {
if !f.RelationalFields[n].PrimaryKey && !f.RelationalFields[n].Timestamp {
names[n] = n
}
}
dates := make(map[string]string)
for n := range f.RelationalFields {
if f.RelationalFields[n].Timestamp {
dates[n] = n
}
}
// Sort only the fields that aren't pk or date
j := 0
sortnames := make([]string, len(names))
for n := range names {
sortnames[j] = n
j++
}
sort.Strings(sortnames)
// Put them back together
j = 0
i := len(pks) + len(names) + len(dates)
fields := make([]string, i)
for _, pk := range pks {
fields[j] = pk
j++
}
for _, name := range sortnames {
fields[j] = name
j++
}
for _, date := range dates {
fields[j] = date
j++
}
// Iterate them
for _, n := range fields {
if err := it(f.RelationalFields[n]); err != nil {
return err
}
}
return nil
}
// PopulateFromModeledType creates fields for the model
// based on the goa UserTypeDefinition it models.
// This happens before fields are processed, so it's
// ok to just assign without testing.
func (f *RelationalModelDefinition) PopulateFromModeledType() {
if f.BuiltFrom == nil {
return
}
for _, mt := range f.BuiltFrom {
obj := mt.ToObject()
obj.IterateAttributes(func(name string, att *design.AttributeDefinition) error {
rf := &RelationalFieldDefinition{}
rf.Parent = f
rf.Name = codegen.Goify(name, true)
if strings.HasSuffix(rf.Name, "Id") {
rf.Name = strings.TrimSuffix(rf.Name, "Id")
rf.Name = rf.Name + "ID"
}
switch att.Type.Kind() {
case design.BooleanKind:
rf.Datatype = Boolean
case design.IntegerKind:
rf.Datatype = Integer
case design.NumberKind:
rf.Datatype = Decimal
case design.StringKind:
rf.Datatype = String
case design.DateTimeKind:
rf.Datatype = Timestamp
default:
dslengine.ReportError("Unsupported type: %#v ", att.Type.Kind())
}
f.RelationalFields[rf.Name] = rf
return nil
})
}
return
}