Class: ActiveRecordQueryFixer

Inherits:
Object
  • Object
show all
Defined in:
lib/active_record_query_fixer.rb,
lib/active_record_query_fixer/version.rb

Defined Under Namespace

Modules: RelationExtentions

Constant Summary collapse

VERSION = 
"0.0.8".freeze

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(args) ⇒ ActiveRecordQueryFixer

Returns a new instance of ActiveRecordQueryFixer.



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# File 'lib/active_record_query_fixer.rb', line 10

def initialize(args)
  @query = args.fetch(:query)
  @count_select = 0
end

Instance Attribute Details

#query ⇒ Object (readonly)

Returns the value of attribute query.



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# File 'lib/active_record_query_fixer.rb', line 4

def query
  @query
end

Class Method Details

.fix(query) ⇒ Object 



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# File 'lib/active_record_query_fixer.rb', line 6

def self.fix(query)
  new(query: query).fix.query
end

Instance Method Details

#fix ⇒ Object 



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# File 'lib/active_record_query_fixer.rb', line 15

def fix
  fix_reference_group if fix_reference_group?
  fix_order_group if fix_order_group?
  fix_order_select_distinct if fix_order_select_distinct?
  fix_distinct_group_select if @query.values[:distinct] && @query.values[:group] && @query.values[:select]

  self
end

#fix_distinct_group_select ⇒ Object 



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# File 'lib/active_record_query_fixer.rb', line 24

def fix_distinct_group_select
  require "dig_bang"
  require "pg_query"

  parsed_query = PgQuery.parse(@query.to_sql)
  select_targets = parsed_query.tree.dig!(0, "RawStmt", "stmt", "SelectStmt", "targetList")

  select_targets.each do |select_target|
    fields = select_target.dig!("ResTarget", "val", "ColumnRef", "fields")
    next if fields.length != 2

    table = fields[0].dig("String", "str")
    column = fields[1].dig("String", "str")

    if column
      # A table and a column has been selected - make sure to group by that
      @query = @query.group("#{table}.#{column}")
    elsif fields[1].key?("A_Star")
      # A table and a star has been selected - assume the primary key is called "id" and group by that
      @query = @query.group("#{table}.id")
    end
  end

  self
end

#fix_order_group ⇒ Object 



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# File 'lib/active_record_query_fixer.rb', line 50

def fix_order_group
  @query = @query.group(@query.model.arel_table[@query.model.primary_key])

  @query.values[:order]&.each do |order|
    @query = @query.group(extract_table_and_column_from_expression(order)) if group_by_order?(order)
  end

  self
end

#fix_order_select_distinct ⇒ Object 



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# File 'lib/active_record_query_fixer.rb', line 60

def fix_order_select_distinct
  changed = false
  @query.values[:order]&.each do |order|
    @query = @query.select("#{extract_table_and_column_from_expression(order)} AS active_record_query_fixer_#{@count_select}")
    changed = true
    @count_select += 1
  end

  @query = @query.select("#{@query.table_name}.*") if changed

  self
end

#fix_reference_group ⇒ Object 



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# File 'lib/active_record_query_fixer.rb', line 73

def fix_reference_group
  @query = @query.group(@query.model.arel_table[@query.model.primary_key])

  @query.values[:references].each do |reference|
    @query = @query.group("#{reference}.id")
  end

  self
end