skydb

package
v0.4.0 Latest Latest
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 Go to latest Published: Jan 13, 2016 License: Apache-2.0 Imports: 11 Imported by: 0

Documentation

Index

Constants

View Source 
const (
	Ascending SortOrder = iota
	Descending
	Asc  = Ascending
	Desc = Descending
)

A list of SordOrder, their meaning is self descriptive.

Variables

View Source 
var EmptyRows = NewRows(emptyRowsIter(0))

EmptyRows is a convenient variable that acts as an empty Rows. Useful for skydb implementators and testing.

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var ErrDatabaseTxDidBegin = errors.New("skydb: a transaction has already begun")
View Source 
var ErrDatabaseTxDidNotBegin = errors.New("skydb: a transaction has not begun")
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var ErrDatabaseTxDone = errors.New("skydb: Database's transaction has already commited or rolled back")
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var ErrDeviceNotFound = errors.New("skydb: Specific device not found")

ErrDeviceNotFound is returned by Conn.GetDevice, Conn.DeleteDevice, Conn.DeleteDeviceByToken and Conn.DeleteEmptyDevicesByTime, if the desired Device cannot be found in the current container

View Source 
var ErrRecordNotFound = errors.New("skydb: Record not found for the specified key")

ErrRecordNotFound is returned from Get and Delete when Database cannot find the Record by the specified key

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var ErrSubscriptionNotFound = errors.New("skydb: Subscription ID not found")

ErrSubscriptionNotFound is returned from GetSubscription or DeleteSubscription when the specific subscription cannot be found.

View Source 
var ErrUserDuplicated = errors.New("skydb: duplicated UserID or Username")

ErrUserDuplicated is returned by Conn.CreateUser when the UserInfo to be created has the same ID/username in the current container

View Source 
var ErrUserNotFound = errors.New("skydb: UserInfo ID not found")

ErrUserNotFound is returned by Conn.GetUser, Conn.UpdateUser and Conn.DeleteUser when the UserInfo's ID is not found in the current container

View Source 
var ZeroTime = time.Time{}

ZeroTime represent a zero time.Time. It is used in DeleteDeviceByToken and DeleteEmptyDevicesByTime to signify a Delete without time constraint.

Functions

func Register 

func Register(name string, driver Driver)

Register makes an Skygear database driver available with the given name.

Register panics if it is called with a nil driver or the same driver name is being registered twice.

Types

type ACLLevel 

type ACLLevel string

ACLLevel represent the operation a user granted on a resource 

const (
	ReadLevel  ACLLevel = "read"
	WriteLevel          = "write"
)

ReadLevel and WriteLevel is self-explanatory

type APSSetting 

type APSSetting struct {
	Alert                      *AppleAlert `json:"alert,omitempty"`
	SoundName                  string      `json:"sound,omitempty"`
	ShouldBadge                bool        `json:"should-badge,omitempty"`
	ShouldSendContentAvailable bool        `json:"should-send-content-available,omitempty"`
}

APSSetting describes how server should send a notification to a targeted device via Apple Push Service.

type AccessModel added in v0.4.0 

type AccessModel int

AccessModel indicates the type of access control model while db query. 

const (
	RoleBasedAccess AccessModel = iota + 1
	RelationBasedAccess
)

RoleBasedAccess is tranditional Role based Access Control RelationBasedAccess is Access Control determine by the user-user relation between creator and accessor

func GetAccessModel added in v0.4.0 

func GetAccessModel(accessString string) AccessModel

GetAccessModel convert the string config to internal const

type AppleAlert 

type AppleAlert struct {
	Body                  string   `json:"body,omitempty"`
	LocalizationKey       string   `json:"loc-key,omitempty"`
	LocalizationArgs      []string `json:"loc-args,omitempty"`
	LaunchImage           string   `json:"launch-image,omitempty"`
	ActionLocalizationKey string   `json:"action-loc-key,omitempty"`
}

AppleAlert describes how a remote notification behaves and shows itself when received.

It is a subset of attributes defined in Apple's "Local and Remote Notification Programming Guide". Please follow the following link for detailed description of the attributes. 

https://developer.apple.com/library/ios/documentation/NetworkingInternet/Conceptual/RemoteNotificationsPG/Chapters/ApplePushService.html#//apple_ref/doc/uid/TP40008194-CH100-SW20

type Asset 

type Asset struct {
	Name        string
	ContentType string
	Size        int64
	Public      bool
	Signer      asset.URLSigner
}

func (*Asset) SignedURL 

func (a *Asset) SignedURL() string

SignedURL will try to return a signedURL with the injected Signer.

type AuthInfo 

type AuthInfo map[string]map[string]interface{}

AuthInfo represents the dictionary of authenticated principal ID => authData.

For example, a UserInfo connected with a Facebook account might look like this: 

{
  "com.facebook:46709394": {
    "accessToken": "someAccessToken",
    "expiredAt": "2015-02-26T20:05:48",
    "facebookID": "46709394"
  }
}

It is assumed that the Facebook AuthProvider has "com.facebook" as provider name and "46709394" as the authenticated Facebook account ID.

type Conn 

type Conn interface {

	// CreateUser creates a new UserInfo in the container
	// this Conn associated to.
	CreateUser(userinfo *UserInfo) error

	// GetUser fetches the UserInfo with supplied ID in the container and
	// fills in the supplied UserInfo with the result.
	//
	// GetUser returns ErrUserNotFound if no UserInfo exists
	// for the supplied ID.
	GetUser(id string, userinfo *UserInfo) error

	// GetUserByUsernameEmail fetch the UserInfo with supplied username or email,
	//
	GetUserByUsernameEmail(username string, email string, userinfo *UserInfo) error

	// GetUserByPrincipalID fetches the UserInfo with supplied principal ID in the
	// container and fills in the supplied UserInfo with the result.
	//
	// Principal ID is an ID of an authenticated principal with such
	// authentication provided by AuthProvider.
	//
	// GetUserByPrincipalID returns ErrUserNotFound if no UserInfo exists
	// for the supplied principal ID.
	GetUserByPrincipalID(principalID string, userinfo *UserInfo) error

	// UpdateUser updates an existing UserInfo matched by the ID field.
	//
	// UpdateUser returns ErrUserNotFound if such UserInfo does not
	// exist in the container.
	UpdateUser(userinfo *UserInfo) error

	// QueryUser queries for UserInfo matching one of the specified emails.
	QueryUser(emails []string) ([]UserInfo, error)

	// DeleteUser removes UserInfo with the supplied ID in the container.
	//
	// DeleteUser returns ErrUserNotFound if such UserInfo does not
	// exist in the container.
	DeleteUser(id string) error

	// GetAsset retrieves Asset information by its name
	GetAsset(name string, asset *Asset) error

	// SaveAsset saves an Asset information into a container to
	// be referenced by records.
	SaveAsset(asset *Asset) error

	QueryRelation(user string, name string, direction string, config QueryConfig) []UserInfo
	QueryRelationCount(user string, name string, direction string) (uint64, error)
	AddRelation(user string, name string, targetUser string) error
	RemoveRelation(user string, name string, targetUser string) error

	GetDevice(id string, device *Device) error

	// QueryDevicesByUser queries the Device database which are registered
	// by the specified user.
	QueryDevicesByUser(user string) ([]Device, error)
	SaveDevice(device *Device) error
	DeleteDevice(id string) error

	// DeleteDeviceByToken deletes device where its Token == token and
	// LastRegisteredAt < t. If t == ZeroTime, LastRegisteredAt is not considered.
	//
	// If such device does not exist, ErrDeviceNotFound is returned.
	DeleteDeviceByToken(token string, t time.Time) error

	// DeleteEmptyDevicesByTime deletes device where Token is empty and
	// LastRegisteredAt < t. If t == ZeroTime, LastRegisteredAt is not considered.
	//
	// If such device does not exist, ErrDeviceNotFound is returned.
	DeleteEmptyDevicesByTime(t time.Time) error

	PublicDB() Database
	PrivateDB(userKey string) Database

	// Subscribe registers the specified recordEventChan to receive
	// RecordEvent from the Conn implementation
	Subscribe(recordEventChan chan RecordEvent) error

	Close() error
}

Conn encapsulates the interface of an Skygear connection to a container.

func Open 

func Open(implName string, appName string, accessString string, optionString string) (Conn, error)

Open returns an implementation of Conn to use w.r.t implName.

optionString is passed to the driver and is implementation specific. For example, in a SQL implementation it will be something like "sql://localhost/db0"

type CountFunc 

type CountFunc struct {
	OverallRecords bool
}

CountFunc represents a function that count number of rows matching a query

func (CountFunc) Args 

func (f CountFunc) Args() []interface{}

Args implements the Func interface

type DBHookFunc 

type DBHookFunc func(Database, *Record, RecordHookEvent)

DBHookFunc specifies the interface of a database hook function

type Data 

type Data map[string]interface{}

A Data represents a key-value object used for storing ODRecord.

type DataType 

type DataType uint

DataType defines the type of data that can saved into an skydb database 

const (
	TypeString DataType = iota + 1
	TypeNumber
	TypeBoolean
	TypeJSON
	TypeReference
	TypeLocation
	TypeDateTime
	TypeAsset
	TypeACL
	TypeInteger
	TypeSequence
)

List of persistable data types in skydb

type Database 

type Database interface {

	// Conn returns the parent Conn of the Database
	Conn() Conn

	// ID returns the identifier of the Database.
	ID() string

	// Get fetches the Record identified by the supplied key and
	// writes it onto the supplied Record.
	//
	// Get returns an ErrRecordNotFound if Record identified by
	// the supplied key does not exist in the Database.
	// It also returns error if the underlying implementation
	// failed to read the Record.
	Get(id RecordID, record *Record) error
	GetByIDs(ids []RecordID) (*Rows, error)

	// Save updates the supplied Record in the Database if Record with
	// the same key exists, else such Record is created.
	//
	// Save returns an error if the underlying implemention failed to
	// create / modify the Record.
	Save(record *Record) error

	// Delete removes the Record identified by the key in the Database.
	//
	// Delete returns an ErrRecordNotFound if the Record identified by
	// the supplied key does not exist in the Database.
	// It also returns an error if the underlying implementation
	// failed to remove the Record.
	Delete(id RecordID) error

	// Query executes the supplied query against the Database and returns
	// an Rows to iterate the results.
	Query(query *Query) (*Rows, error)

	// QueryCount executes the supplied query against the Database and returns
	// the number of records matching the query's predicate.
	QueryCount(query *Query) (uint64, error)

	// Extend extends the Database record schema such that a record
	// arrived subsequently with that schema can be saved
	//
	// Extend returns an error if the specified schema conflicts with
	// existing schem in the Database
	Extend(recordType string, schema RecordSchema) error

	GetSubscription(key string, deviceID string, subscription *Subscription) error
	SaveSubscription(subscription *Subscription) error
	DeleteSubscription(key string, deviceID string) error
	GetSubscriptionsByDeviceID(deviceID string) []Subscription
	GetMatchingSubscriptions(record *Record) []Subscription
}

Database represents a collection of record (either public or private) in a container.

type Device 

type Device struct {
	ID               string
	Type             string
	Token            string
	UserInfoID       string
	LastRegisteredAt time.Time
}

Device represents a device owned by a user and ready to receive notification.

type DistanceFunc 

type DistanceFunc struct {
	Field    string
	Location Location
}

DistanceFunc represents a function that calculates distance between a user supplied location and a Record's field

func (DistanceFunc) Args 

func (f DistanceFunc) Args() []interface{}

Args implements the Func interface

type Driver 

type Driver interface {
	Open(appName string, accessModel AccessModel, optionString string) (Conn, error)
}

Driver opens an connection to the underlying database.

type DriverFunc 

type DriverFunc func(appName string, accessModel AccessModel, optionString string) (Conn, error)

The DriverFunc type is an adapter such that an ordinary function can be used as a Driver.

func (DriverFunc) Open 

func (f DriverFunc) Open(appName string, accessModel AccessModel, name string) (Conn, error)

Open returns a Conn by calling the DriverFunc itself.

type Expression 

type Expression struct {
	Type  ExpressionType
	Value interface{}
}

An Expression represents value to be compared against.

func (Expression) IsEmpty added in v0.3.0 

func (expr Expression) IsEmpty() bool

func (Expression) IsKeyPath 

func (expr Expression) IsKeyPath() bool

func (Expression) IsLiteralArray 

func (expr Expression) IsLiteralArray() bool

func (Expression) IsLiteralMap 

func (expr Expression) IsLiteralMap() bool

func (Expression) IsLiteralString 

func (expr Expression) IsLiteralString() bool

type ExpressionType 

type ExpressionType int

ExpressionType is the type of an Expression. 

const (
	Literal ExpressionType = iota + 1
	KeyPath
	Function
)

A list of ExpressionTypes.

type FieldType 

type FieldType struct {
	Type          DataType
	ReferenceType string     // used only by TypeReference
	Expression    Expression // used by Computed Keys
}

FieldType represents the kind of data living within a field of a RecordSchema.

type Func 

type Func interface {
	Args() []interface{}
}

Func is a marker interface to denote a type being a function in skydb.

skydb's function receives zero or more arguments and returns a DataType as a result. Result data type is currently omitted in this interface since skygear doesn't use it internally yet. In the future it can be utilized to provide more extensive type checking at handler level.

type Location 

type Location [2]float64

Location represent a point of geometry.

It being an array of two floats is intended to provide no-copy conversion between paulmach/go.geo.Point.

func NewLocation 

func NewLocation(lng, lat float64) Location

NewLocation returns a new Location

func (Location) Lat 

func (loc Location) Lat() float64

Lat returns the Latitude

func (Location) Lng 

func (loc Location) Lng() float64

Lng returns the longitude

func (Location) String 

func (loc Location) String() string

String returns a human-readable representation of this Location. Coincidentally it is in WKT.

type MemoryRows 

type MemoryRows struct {
	CurrentRowIndex int
	Records         []Record
}

MemoryRows is a native implementation of RowIter. Can be used in test not support cursor.

func NewMemoryRows 

func NewMemoryRows(records []Record) *MemoryRows

func (*MemoryRows) Close 

func (rs *MemoryRows) Close() error

func (*MemoryRows) Next 

func (rs *MemoryRows) Next(record *Record) error

func (*MemoryRows) OverallRecordCount 

func (rs *MemoryRows) OverallRecordCount() *uint64

type NotificationInfo 

type NotificationInfo struct {
	APS APSSetting `json:"aps,omitempty"`
}

NotificationInfo describes how server should send a notification to a target devices via a push service. Currently only APS is supported.

type Operator 

type Operator int

Operator denotes how the result of a predicate is determined from its subpredicates or subexpressions. 

const (
	And Operator = iota + 1
	Or
	Not
	Equal
	GreaterThan
	LessThan
	GreaterThanOrEqual
	LessThanOrEqual
	NotEqual
	Like
	ILike
	In
	Functional
)

A list of Operator.

func (Operator) IsBinary 

func (op Operator) IsBinary() bool

IsBinary checks whether the Operator determines the result of a predicate by comparing two subexpressions.

func (Operator) IsCompound 

func (op Operator) IsCompound() bool

IsCompound checks whether the Operator is a compound operator, meaning the operator combine the results of other subpredicates.

type Predicate 

type Predicate struct {
	Operator Operator
	Children []interface{}
}

Predicate is a representation of used in query for filtering records.

func (Predicate) GetExpressions 

func (p Predicate) GetExpressions() (ps []Expression)

GetExpressions returns Predicate.Children as []Expression.

This method is only valid when Operator is binary operator. Caller is responsible to check for this preconditions. Otherwise the method will panic.

func (Predicate) GetSubPredicates 

func (p Predicate) GetSubPredicates() (ps []Predicate)

GetSubPredicates returns Predicate.Children as []Predicate.

This method is only valid when Operator is either And, Or and Not. Caller is responsible to check for this preconditions. Otherwise the method will panic.

func (Predicate) IsEmpty added in v0.3.0 

func (p Predicate) IsEmpty() bool

func (Predicate) Validate 

func (p Predicate) Validate() skyerr.Error

Validate returns an Error if a Predicate is invalid.

If a Predicate is validated without error, nil is returned.

type Query 

type Query struct {
	Type         string
	Predicate    Predicate
	Sorts        []Sort
	ReadableBy   string
	ComputedKeys map[string]Expression
	DesiredKeys  []string
	GetCount     bool
	Limit        *uint64
	Offset       uint64
}

Query specifies the type, predicate and sorting order of Database query. ReadableBy is a temp solution for ACL before a full predicate implemented.

type QueryConfig added in v0.3.0 

type QueryConfig struct {
	Limit  uint64
	Offset uint64
}

QueryConfig provides optional parameters for queries. result is unlimited if Limit=0

type Record 

type Record struct {
	ID         RecordID
	DatabaseID string `json:"-"`
	OwnerID    string
	CreatedAt  time.Time
	CreatorID  string
	UpdatedAt  time.Time
	UpdaterID  string
	ACL        RecordACL
	Data       Data
	Transient  Data `json:"-"`
}

Record is the primary entity of storage in Skygear.

func (*Record) Get 

func (r *Record) Get(key string) interface{}

Get returns the value specified by key. If no value is associated with the specified key, it returns nil.

Get also supports getting reserved fields starting with "_". If such reserved field does not exists, it returns nil.

func (*Record) Set 

func (r *Record) Set(key string, i interface{})

Set associates key with the value i in this record.

Set is able to associate reserved key name starting with "_" as well. If there is no such key, it panics.

type RecordACL 

type RecordACL []RecordACLEntry

RecordACL is a list of ACL entries defining access control for a record

func NewRecordACL 

func NewRecordACL(entries []RecordACLEntry) RecordACL

NewRecordACL returns a new RecordACL

func (*RecordACL) InitFromJSON 

func (acl *RecordACL) InitFromJSON(i interface{}) error

InitFromJSON initializes a RecordACL

type RecordACLEntry 

type RecordACLEntry struct {
	Relation string   `json:"relation"`
	Level    ACLLevel `json:"level"`
	UserID   string   `json:"user_id,omitempty"`
}

RecordACLEntry grants access to a record by relation or by user_id

func NewRecordACLEntryDirect 

func NewRecordACLEntryDirect(userID string, level ACLLevel) RecordACLEntry

NewRecordACLEntryDirect returns an ACE for a specific user

func NewRecordACLEntryRelation 

func NewRecordACLEntryRelation(relation string, level ACLLevel) RecordACLEntry

NewRecordACLEntryRelation returns an ACE on relation

func (*RecordACLEntry) InitFromJSON 

func (entry *RecordACLEntry) InitFromJSON(i interface{}) error

InitFromJSON initializes a RecordACLEntry from a unmarshalled JSON of access control definition

type RecordEvent 

type RecordEvent struct {
	Record *Record
	Event  RecordHookEvent
}

RecordEvent describes a change event on Record which is either Created, Updated or Deleted.

For RecordCreated or RecordUpdated event, Record is the newly created / updated Record. For RecordDeleted, Record is the Record being deleted.

type RecordHookEvent 

type RecordHookEvent int

RecordHookEvent indicates the type of record event that triggered the hook 

const (
	RecordCreated RecordHookEvent = iota + 1
	RecordUpdated
	RecordDeleted
)

See the definition of RecordHookEvent

type RecordID 

type RecordID struct {
	Type string
	Key  string
}

RecordID identifies an unique record in a Database

func NewRecordID 

func NewRecordID(recordType string, id string) RecordID

NewRecordID returns a new RecordID

func (RecordID) MarshalText 

func (id RecordID) MarshalText() ([]byte, error)

MarshalText implements the encoding.TextUnmarshaler interface.

func (RecordID) String 

func (id RecordID) String() string

String implements the fmt.Stringer interface.

func (*RecordID) UnmarshalText 

func (id *RecordID) UnmarshalText(data []byte) error

UnmarshalText implements the encoding.TextMarshaler interface.

type RecordSchema 

type RecordSchema map[string]FieldType

RecordSchema is a mapping of record key to its value's data type or reference

type Reference 

type Reference struct {
	ID RecordID
}

func NewReference 

func NewReference(recordType string, id string) Reference

func (*Reference) Type 

func (reference *Reference) Type() string

type Rows 

type Rows struct {
	// contains filtered or unexported fields
}

Rows implements a scanner-like interface for easy iteration on a result set returned from a query

func NewRows 

func NewRows(iter RowsIter) *Rows

NewRows creates a new Rows.

Driver implementators are expected to call this method with their implementation of RowsIter to return a Rows from Database.Query.

func (*Rows) Close 

func (r *Rows) Close() error

Close closes the Rows and prevents futher enumerations on the instance.

func (*Rows) Err 

func (r *Rows) Err() error

Err returns the last error encountered during Scan.

NOTE: It is not an error if the underlying result set is exhausted.

func (*Rows) OverallRecordCount 

func (r *Rows) OverallRecordCount() *uint64

OverallRecordCount returns the number of matching records in the database if this resultset contains any rows.

func (*Rows) Record 

func (r *Rows) Record() Record

Record returns the current record in Rows.

It must be called after calling Scan and Scan returned true. If Scan is not called or previous Scan return false, the behaviour of Record is unspecified.

func (*Rows) Scan 

func (r *Rows) Scan() bool

Scan tries to prepare the next record and returns whether such record is ready to be read.

type RowsIter 

type RowsIter interface {
	// Close closes the rows iterator
	Close() error

	// Next populates the next Record in the current rows iterator into
	// the provided record.
	//
	// Next should return io.EOF when there are no more rows
	Next(record *Record) error

	OverallRecordCount() *uint64
}

RowsIter is an iterator on results returned by execution of a query.

type Sequence 

type Sequence struct{}

Sequence is a bogus data type for creating a sequence field via JIT schema migration

type Sort 

type Sort struct {
	KeyPath string
	Func    Func
	Order   SortOrder
}

Sort specifies the order of a collection of Records returned from a Query.

Record order can be sorted w.r.t. a record field or a value returned from a predefined function.

type SortOrder 

type SortOrder int

SortOrder denotes an the order of Records returned from a Query.

type Subscription 

type Subscription struct {
	ID               string            `json:"id"`
	Type             string            `json:"type"`
	DeviceID         string            `json:"device_id"`
	NotificationInfo *NotificationInfo `json:"notification_info,omitempty"`
	Query            Query             `json:"query"`
}

Subscription represents a device's subscription of notification triggered by changes of results from a query.

type TxDatabase 

type TxDatabase interface {
	// Begin opens a transaction for the current Database.
	//
	// Calling Begin on an already Begin'ed Database returns ErrDatabaseTxDidBegin.
	Begin() error

	// Commit saves all the changes made to Database after Begin atomically.
	Commit() error

	// Rollbacks discards all the changes made to Database after Begin.
	Rollback() error
}

TxDatabase defines the methods for a Database that supports transaction.

A Begin'ed transaction must end with a call to Commit or Rollback. After that, all opertions on Database will return ErrDatabaseTxDone.

NOTE(limouren): The interface is not Database specific, but currently only Database supports it.

type UserInfo 

type UserInfo struct {
	ID             string   `json:"_id"`
	Username       string   `json:"username,omitempty"`
	Email          string   `json:"email,omitempty"`
	HashedPassword []byte   `json:"password,omitempty"`
	Auth           AuthInfo `json:"auth,omitempty"` // auth data for alternative methods
}

UserInfo contains a user's information for authentication purpose

func NewAnonymousUserInfo 

func NewAnonymousUserInfo() UserInfo

NewAnonymousUserInfo returns an anonymous UserInfo, which has no Email and Password.

func NewProvidedAuthUserInfo 

func NewProvidedAuthUserInfo(principalID string, authData map[string]interface{}) UserInfo

NewProvidedAuthUserInfo returns an UserInfo provided by a AuthProvider, which has no Email and Password.

func NewUserInfo 

func NewUserInfo(username string, email string, password string) UserInfo

NewUserInfo returns a new UserInfo with specified username, email and password. An UUID4 ID will be generated by the system as unique identifier

func (*UserInfo) GetProvidedAuthData 

func (info *UserInfo) GetProvidedAuthData(principalID string) map[string]interface{}

GetProvidedAuthData gets the auth data for the specified principal.

func (UserInfo) IsSamePassword 

func (info UserInfo) IsSamePassword(password string) bool

IsSamePassword determines whether the specified password is the same password as where the HashedPassword is generated from

func (*UserInfo) RemoveProvidedAuthData 

func (info *UserInfo) RemoveProvidedAuthData(principalID string)

RemoveProvidedAuthData remove the auth data for the specified principal.

func (*UserInfo) SetPassword 

func (info *UserInfo) SetPassword(password string)

SetPassword sets the HashedPassword with the password specified

func (*UserInfo) SetProvidedAuthData 

func (info *UserInfo) SetProvidedAuthData(principalID string, authData map[string]interface{})

SetProvidedAuthData sets the auth data to the specified principal.

type UserRelationFunc 

type UserRelationFunc struct {
	KeyPath           string
	RelationName      string
	RelationDirection string
	User              string
}

UserRelationFunc represents a function that is used to evaulate whether a record satisfy certain user-based relation

func (UserRelationFunc) Args 

func (f UserRelationFunc) Args() []interface{}

Args implements the Func interface

Source Files

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