127 lines
3.1 KiB
Ruby
127 lines
3.1 KiB
Ruby
class SqlBuilder
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def initialize(template, klass = nil)
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@args = {}
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@sql = template
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@sections = {}
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@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 = {}|
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@args.merge!(args)
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@sections[k] ||= []
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@sections[k] << data
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self
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end
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end
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def secure_category(secure_category_ids, category_alias = 'c')
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if secure_category_ids.present?
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where("NOT COALESCE(" << category_alias << ".read_restricted, false) OR " << category_alias << ".id IN (:secure_category_ids)", secure_category_ids: secure_category_ids)
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else
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where("NOT COALESCE(" << category_alias << ".read_restricted, false)")
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end
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self
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end
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def to_sql
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sql = @sql.dup
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@sections.each do |k, v|
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joined = nil
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case k
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when :select
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joined = "SELECT " << v.join(" , ")
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when :where, :where2
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joined = "WHERE " << v.map { |c| "(" << c << ")" }.join(" AND ")
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when :join
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joined = v.map { |item| "JOIN " << item }.join("\n")
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when :left_join
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joined = v.map { |item| "LEFT JOIN " << item }.join("\n")
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when :limit
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joined = "LIMIT " << v.last.to_s
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when :offset
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joined = "OFFSET " << v.last.to_s
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when :order_by
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joined = "ORDER BY " << v.join(" , ")
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when :set
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joined = "SET " << v.join(" , ")
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end
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sql.sub!("/*#{k}*/", joined)
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end
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sql
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end
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def exec(args = {})
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@args.merge!(args)
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sql = to_sql
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if @klass
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@klass.find_by_sql(ActiveRecord::Base.send(:sanitize_sql_array, [sql, @args]))
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else
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if @args == {}
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ActiveRecord::Base.exec_sql(sql)
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else
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ActiveRecord::Base.exec_sql(sql, @args)
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end
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end
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end
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def self.map_exec(klass, sql, args = {})
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self.new(sql).map_exec(klass, args)
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end
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class RailsDateTimeDecoder < PG::SimpleDecoder
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def decode(string, tuple = nil, field = nil)
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if Rails.version >= "4.2.0"
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@caster ||= ActiveRecord::Type::DateTime.new
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@caster.cast(string)
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else
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ActiveRecord::ConnectionAdapters::Column.string_to_time string
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end
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end
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end
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class ActiveRecordTypeMap < PG::BasicTypeMapForResults
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def initialize(connection)
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super(connection)
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rm_coder 0, 1114
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add_coder RailsDateTimeDecoder.new(name: "timestamp", oid: 1114, format: 0)
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# we don't need deprecations
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self.default_type_map = PG::TypeMapInRuby.new
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end
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end
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def self.pg_type_map
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conn = ActiveRecord::Base.connection.raw_connection
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@typemap ||= ActiveRecordTypeMap.new(conn)
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end
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def map_exec(klass = OpenStruct, args = {})
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results = exec(args)
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results.type_map = SqlBuilder.pg_type_map
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setters = results.fields.each_with_index.map do |f, index|
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f.dup << "="
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end
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values = results.values
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values.map! do |row|
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mapped = klass.new
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setters.each_with_index do |name, index|
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mapped.send name, row[index]
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end
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mapped
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end
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end
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end
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class ActiveRecord::Base
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def self.sql_builder(template)
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SqlBuilder.new(template, self)
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end
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end
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