75 lines
2.3 KiB
Ruby
75 lines
2.3 KiB
Ruby
class Tag < ActiveRecord::Base
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validates :name, presence: true, uniqueness: true
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has_many :tag_users # notification settings
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has_many :topic_tags, dependent: :destroy
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has_many :topics, through: :topic_tags
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has_many :category_tags, dependent: :destroy
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has_many :categories, through: :category_tags
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has_many :tag_group_memberships
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has_many :tag_groups, through: :tag_group_memberships
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COUNT_ARG = "topic_tags.id"
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# Apply more activerecord filters to the tags_by_count_query, and then
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# fetch the result with .count(Tag::COUNT_ARG).
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#
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# e.g., Tag.tags_by_count_query.where("topics.category_id = ?", category.id).count(Tag::COUNT_ARG)
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def self.tags_by_count_query(opts = {})
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q = Tag.joins("LEFT JOIN topic_tags ON tags.id = topic_tags.tag_id")
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.joins("LEFT JOIN topics ON topics.id = topic_tags.topic_id")
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.group("tags.id, tags.name")
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.order('count_topic_tags_id DESC')
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q = q.limit(opts[:limit]) if opts[:limit]
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q
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end
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def self.category_tags_by_count_query(category, opts = {})
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tags_by_count_query(opts).where("tags.id in (select tag_id from category_tags where category_id = ?)", category.id)
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.where("topics.category_id = ?", category.id)
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end
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def self.top_tags(limit_arg: nil, category: nil, guardian: nil)
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limit = limit_arg || SiteSetting.max_tags_in_filter_list
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scope_category_ids = (guardian || Guardian.new).allowed_category_ids
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if category
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scope_category_ids &= ([category.id] + category.subcategories.pluck(:id))
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end
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tags = DiscourseTagging.filter_allowed_tags(
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tags_by_count_query(limit: limit).where("topics.category_id in (?)", scope_category_ids),
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nil, # Don't pass guardian. You might not be able to use some tags, but should still be able to see where they've been used.
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category: category
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)
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tags.count(COUNT_ARG).map { |name, _| name }
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end
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def self.include_tags?
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SiteSetting.tagging_enabled && SiteSetting.show_filter_by_tag
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end
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def full_url
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"#{Discourse.base_url}/tags/#{self.name}"
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end
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end
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# == Schema Information
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#
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# Table name: tags
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#
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# id :integer not null, primary key
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# name :string not null
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# topic_count :integer default(0), not null
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# created_at :datetime
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# updated_at :datetime
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#
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# Indexes
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#
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# index_tags_on_name (name) UNIQUE
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#
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