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"`
	PostCount int64 `json:"post_count"`
	}

	// 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,
	}
	}

	// NewCategoryFromPartial creates a Category from a partially-populated Category, such as when a user initially creates
	// one.
	func NewCategoryFromPartial(cat Category) Category {
	newCat := &Category{
	Hashtag: cat.Hashtag,
	}
	// Create title from hashtag, if none supplied
	if cat.Title == "" {
	newCat.Title = titleFromHashtag(cat.Hashtag)
	} else {
	newCat.Title = cat.Title
	}
	// Create slug from title, if none supplied; otherwise ensure slug is valid
	if cat.Slug == "" {
	newCat.Slug = slug.Make(newCat.Title)
	} else {
	newCat.Slug = slug.Make(cat.Slug)
	}
	return newCat
	}