Module: DynamicQuery

Defined in:
lib/dynamic_query.rb,
lib/dynamic_query/helper.rb,
lib/dynamic_query/joiner.rb,
lib/dynamic_query/railtie.rb,
lib/dynamic_query/version.rb,
lib/dynamic_query/validator.rb,
lib/generators/helper_generator.rb,
lib/dynamic_query/combined_query.rb

Defined Under Namespace

Modules: CombinedQuery, Helper, Joiner, Validator Classes: DynamicQueryInstance, HelperGenerator, Querier, Railtie

Constant Summary collapse

OPERATOR = 
['=', '>', '>=', '<', '<=', '!=',
'LIKE', 'NOT LIKE', 'IN', 'NOT IN',
'BETWEEN', 'NOT BETWEEN', 'IS NULL', 'IS NOT NULL']
MAJOR = 
0
MINOR = 
7
PATCH = 
2
VERSION = 
[MAJOR, MINOR, PATCH].compact.join('.')

Instance Method Summary collapse

Instance Method Details

#all_columns_in(*models) ⇒ Object 



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# File 'lib/dynamic_query.rb', line 52

def all_columns_in(*models)
  models.map { |m| m.columns.map { |col| "#{m.table_name}.#{col.name}" } }.flatten.join ', '
end

#conditioned_count(dq, query, model) ⇒ Object 



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# File 'lib/dynamic_query.rb', line 65

def conditioned_count(dq, query, model)
  conditions = dq.conditions query, model.table_name
  statement = Querier.statement conditions
  model.where(statement).count
end

#dynamic_query(*models, opt) ⇒ Object 



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# File 'lib/dynamic_query.rb', line 12

def dynamic_query(*models, opt)
  models.flatten!
  DynamicQueryInstance.new(*models, opt)
end

#estimate_total(dq, query) ⇒ Object 



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# File 'lib/dynamic_query.rb', line 56

def estimate_total(dq, query)
  models = dq.models
  et = models.map { |m| { :table => m.table_name, :total => m.count, :conditioned => conditioned_count(dq, query, m) } }
  major = et.max_by { |i| i[:total] }
  et.delete major
  estimate = major[:conditioned] * et.map { |i| i[:conditioned].to_f / i[:total] }.reduce(:*)
  estimate = estimate.to_i
end

#tables_joined_by(from, *to_tables) ⇒ Object 



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# File 'lib/dynamic_query.rb', line 17

def tables_joined_by(from, *to_tables)
  sql = ''
  from_table = from.table_name
  to_tables_count = Hash.new(0)
  to_tables.each do |to|
    to_table = to.first.table_name
    if to_tables_count[to_table] == 0
      sql << "INNER JOIN `#{to_table}` ON "
      mappings = []
      to.drop(1).each do |mapping|
        if mapping.kind_of? Array
          mappings << "`#{from_table}`.`#{mapping.first}` = `#{to_table}`.`#{mapping.last}`"
        else
          mappings << "`#{from_table}`.`#{mapping}` = `#{to_table}`.`#{mapping}`"
        end
      end
      sql << "(#{mappings.join(' AND ')})"
      to_tables_count[to_table] += 1
    else
      sql << "INNER JOIN `#{to_table}` `#{to_table}_#{to_tables_count[to_table]}` ON "
      mappings = []
      to.drop(1).each do |mapping|
        if mapping.kind_of? Array
          mappings << "`#{from_table}`.`#{mapping.first}` = `#{to_table}_#{to_tables_count[to_table]}`.`#{mapping.last}`"
        else
          mappings << "`#{from_table}`.`#{mapping}` = `#{to_table}_#{to_tables_count[to_table]}`.`#{mapping}`"
        end
      end
      sql << "(#{mappings.join(' AND ')})"
      to_tables_count[to_table] += 1
    end
  end
  sql
end