62 lines
1.7 KiB
Go
62 lines
1.7 KiB
Go
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package entity
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import (
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"errors"
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"time"
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"github.com/gocql/gocql"
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)
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// Like represents a like entity for posts or comments.
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// Uses composite primary key: (target_id, user_uid) for uniqueness.
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type Like struct {
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ID gocql.UUID `db:"id" partition_key:"true"` // Like unique identifier
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TargetID gocql.UUID `db:"target_id" clustering_key:"true"` // Target ID (post_id or comment_id)
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UserUID string `db:"user_uid" clustering_key:"true"` // User UID who liked
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TargetType string `db:"target_type"` // Target type: "post" or "comment"
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CreatedAt int64 `db:"created_at"` // Creation timestamp
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}
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// TableName returns the Cassandra table name for Like entities.
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func (l *Like) TableName() string {
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return "likes"
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}
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// Validate validates the Like entity
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func (l *Like) Validate() error {
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var zeroUUID gocql.UUID
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if l.TargetID == zeroUUID {
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return errors.New("target_id is required")
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}
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if l.UserUID == "" {
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return errors.New("user_uid is required")
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}
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if l.TargetType != "post" && l.TargetType != "comment" {
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return errors.New("target_type must be 'post' or 'comment'")
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}
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return nil
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}
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// SetTimestamps sets the create timestamp
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func (l *Like) SetTimestamps() {
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if l.CreatedAt == 0 {
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l.CreatedAt = time.Now().UTC().UnixNano() / 1e6 // milliseconds
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}
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}
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// IsNew returns true if this is a new like (no ID set)
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func (l *Like) IsNew() bool {
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var zeroUUID gocql.UUID
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return l.ID == zeroUUID
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}
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// IsPostLike returns true if this like is for a post
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func (l *Like) IsPostLike() bool {
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return l.TargetType == "post"
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}
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// IsCommentLike returns true if this like is for a comment
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func (l *Like) IsCommentLike() bool {
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return l.TargetType == "comment"
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}
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