category.go
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category.go
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	// Package category supports post categories
	package category

	import (
	"errors"
	"github.com/writeas/slug"
	)

	var (
	ErrNotFound = errors.New("category doesn't exist")
	)

	// Category represents a post tag with additional metadata, like a title and slug.
	type Category struct {
	ID int64 `json:"-"`
	Hashtag string `json:"hashtag"`
	Slug string `json:"slug"`
	Title string `json:"title"`
	}

	// NewCategory creates a Category you can insert into the database, based on a hashtag. It automatically breaks up the
	// hashtag by words, based on capitalization, for both the title and a URL-friendly slug.
	func NewCategory(hashtag string) *Category {
	title := titleFromHashtag(hashtag)
	return &Category{
	Hashtag: hashtag,
	Slug: slug.Make(title),
	Title: title,
	}
	}