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# frozen_string_literal: true
class Search < ApplicationRecord
validates :name, presence: true, uniqueness: true
validates :body, presence: true, uniqueness: true
belongs_to :user
has_rich_text :description
# Returns all the results that can be fetched with the current `body`. It's
# returned into a hash which groups the taggable types.
def results
# This can happen as part of an empty Search.new instance. That is, it's
# still invalid, but it's the object being initialized for the default
# search (i.e. just show me everything).
return { things: Thing.order('rate DESC, title, created_at'), comments: [] } if body.blank?
# Parse the body of the search, and return early if nothing was able to be
# parsed (e.g. user wrote unknown identifiers).
parsed = parse_body
return { things: [], comments: [] } if parsed.all? { |_, v| v.blank? }
# And add everything into the `res` hash with the results.
res = find_by_text(plain: parsed[:plain])
res = filter_by_kind(res:, kind: parsed[:kind])
find_by_tags(res:, tags: parsed[:tag], discard_comments: parsed[:kind].present?)
end
protected
# Returns a hash which contains the tags that has been specified (`tag`) and
# the plain text (`plain`) to check on the different fields.
def parse_body
res = { tag: [], plain: [], kind: nil }
split_body.each do |part|
if part.include?(':')
parts = part.split(':', 2)
parts[1] = clean_clause(part: parts[1])
case parts[0]
when 'tag'
res[parts[0].to_sym] << parts[1]
when 'kind'
res[:kind] = Thing.kinds[parts[1]]
end
else
res[:plain] << part
end
end
res
end
# Returns the body split into its constituents. Note that we cannot mindlessly
# do something like `body.split` because that would ignore quotes that are not
# to be split among other things.
def split_body
cur = ''
res = []
co = ''
body.each_char do |c|
if c.match?(/\s/) && co == ''
res << cur if cur.present?
cur = ''
else
# If it is a quote character, check whether it's being opened or
# closed.
co = c == co ? '' : c if c == '"' || c == "'"
cur += c
end
end
res << cur if cur.present? && co.blank?
res
end
# Returns the argument without any leading/trailing quotes.
def clean_clause(part:)
part.gsub(/^("|')+/, '').gsub(/("|')+$/, '')
end
# Returns a hash which groups into taggable types the results by looking the
# `plain` text into different fields.
def find_by_text(plain:)
res = { things: [], comments: [] }
plain.each do |text|
res[:things] = if res[:things].any?
res[:things].and(Thing.like(text:)).order('rate DESC, title, created_at')
else
Thing.like(text:).order('rate DESC, title, created_at')
end
res[:comments] = if res[:comments].any?
res[:comments].and(Comment.like(text:)).order(:created_at)
else
Comment.like(text:).order(:created_at)
end
end
res
end
# Filter the given `res[:things]` part with the given `kind`. If `kind` is
# nil, then the same `res` object is returned.
def filter_by_kind(res:, kind:)
return res unless kind
res[:things] = if res[:things].any?
res[:things].and(Thing.where(kind:))
else
Thing.where(kind:)
end
res
end
# Returns a hash which groups into taggable types the results by matching the
# given `tags` which their references. It expects `res` to be already
# initialized by `find_by_text` (yeah, great design, I know), which is also
# the structure that will be returned.
def find_by_tags(res:, tags:, discard_comments:)
return res if tags.blank?
tags = tags.map { |name| Tag.find_by(name:) }
query = TagReference.where(tag: tags, taggable_type: 'Thing')
query = query.where(taggable_id: res[:things].pluck(:id)) if res[:things].present?
res[:things] = query.joins('INNER JOIN things ON things.id = tag_references.taggable_id')
.group(:taggable_id)
.having('count(taggable_id) = ?', tags.size)
.order('things.rate DESC, things.title, things.created_at')
.map(&:taggable)
if discard_comments
res[:comments] = []
else
query = TagReference.where(tag: tags, taggable_type: 'Comment')
query = query.where(taggable_id: res[:comments].pluck(:id)) if res[:comments].present?
res[:comments] = query.group(:taggable_id)
.having('count(taggable_id) = ?', tags.size)
.map(&:taggable)
end
res
end
end
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