discourse/lib/sql_builder.rb

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class SqlBuilder
def initialize(template,klass=nil)
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@args = {}
@sql = template
@sections = {}
@klass = klass
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end
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[:set, :where2,:where,:order_by,:limit,:left_join,:join,:offset, :select].each do |k|
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define_method k do |data, args = {}|
@args.merge!(args)
@sections[k] ||= []
@sections[k] << data
self
end
end
def secure_category(secure_category_ids, category_alias = 'c')
if secure_category_ids.present?
where("NOT COALESCE(" << category_alias << ".read_restricted, false) OR " << category_alias << ".id IN (:secure_category_ids)", secure_category_ids: secure_category_ids)
else
where("NOT COALESCE(" << category_alias << ".read_restricted, false)")
end
self
end
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def to_sql
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sql = @sql.dup
@sections.each do |k,v|
joined = nil
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case k
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when :select
joined = "SELECT " << v.join(" , ")
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when :where, :where2
joined = "WHERE " << v.map{|c| "(" << c << ")" }.join(" AND ")
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when :join
joined = v.map{|v| "JOIN " << v }.join("\n")
when :left_join
joined = v.map{|v| "LEFT JOIN " << v }.join("\n")
when :limit
joined = "LIMIT " << v.last.to_s
when :offset
joined = "OFFSET " << v.last.to_s
when :order_by
joined = "ORDER BY " << v.join(" , ")
when :set
joined = "SET " << v.join(" , ")
end
sql.sub!("/*#{k}*/", joined)
end
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sql
end
def exec(args = {})
@args.merge!(args)
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sql = to_sql
if @klass
@klass.find_by_sql(ActiveRecord::Base.send(:sanitize_sql_array, [sql, @args]))
else
if @args == {}
ActiveRecord::Base.exec_sql(sql)
else
ActiveRecord::Base.exec_sql(sql,@args)
end
end
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end
#AS reloads this on tests
remove_const :FTYPE_MAP if defined? FTYPE_MAP
FTYPE_MAP = {
23 => :value_to_integer,
1114 => :string_to_time,
16 => :value_to_boolean
}
def self.map_exec(klass, sql, args = {})
self.new(sql).map_exec(klass, args)
end
def map_exec(klass = OpenStruct, args = {})
results = exec(args)
setters = results.fields.each_with_index.map do |f, index|
[(f.dup << "=").to_sym, FTYPE_MAP[results.ftype(index)]]
end
values = results.values
values.map! do |row|
mapped = klass.new
setters.each_with_index do |mapper, index|
translated = row[index]
if mapper[1] && !translated.nil?
translated = ActiveRecord::ConnectionAdapters::Column.send mapper[1], translated
end
mapped.send mapper[0], translated
end
mapped
end
end
end
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class ActiveRecord::Base
def self.sql_builder(template)
SqlBuilder.new(template, self)
end
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end