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autocomplete.rb
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autocomplete.rb
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module Queries
# See
# http://www.slideshare.net/camerondutro/advanced-arel-when-activerecord-just-isnt-enough
# https://github.com/rails/arel
# http://robots.thoughtbot.com/using-arel-to-compose-sql-queries
# https://github.com/rails/arel/blob/master/lib/arel/predications.rb
# And this:
# http://blog.arkency.com/2013/12/rails4-preloading/
# User.includes(:addresses).where("addresses.country = ?", "Poland").references(:addresses)
#
class Otu::Autocomplete < Queries::Query
def base_query
::Otu.select('otus.*')
end
# @return [Arel::Table]
def table
::Otu.arel_table
end
def base_queries
queries = [
autocomplete_exactly_named,
autocomplete_exact_id,
autocomplete_identifier_cached_exact,
autocomplete_identifier_identifier_exact,
autocomplete_named,
autocomplete_via_taxon_name_autocomplete,
autocomplete_identifier_cached_like,
autocomplete_common_name_exact,
autocomplete_common_name_like
]
queries.compact!
return [] if queries.nil?
updated_queries = []
queries.each_with_index do |q ,i|
a = q.where(project_id: project_id) if project_id
a ||= q
updated_queries[i] = a
end
updated_queries
end
# @return [Array]
def autocomplete
updated_queries = base_queries
result = []
updated_queries.each do |q|
result += q.to_a
result.uniq!
break if result.count > 39
end
result[0..39]
end
# @return [Scope]
def autocomplete_via_taxon_name_autocomplete
taxon_names = Queries::TaxonName::Autocomplete.new(query_string, project_id: project_id).autocomplete
::Otu.joins(:taxon_name).where(taxon_name: taxon_names).references(:taxon_names).limit(40).order(Arel.sql('char_length(otus.name), char_length(taxon_names.cached), taxon_names.cached ASC'))
end
end
end