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 = 
"0.0.16".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 12

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 6

def query
  @query
end

Class Method Details

.fix(query) ⇒ Object 



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# File 'lib/active_record_query_fixer.rb', line 8

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 17

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_select_group if query.values[:select] && query.values[:group]

  self
end

#fix_order_group ⇒ Object 



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# File 'lib/active_record_query_fixer.rb', line 46

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

  sort_targets.each do |sort_target|
    fields = sort_target.dig("SortBy", "node", "ColumnRef", "fields")
    next if !fields || fields.length != 2

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

    @query = query.group("#{table}.#{column}") if table && column
  end

  self
end

#fix_order_select_distinct ⇒ Object 



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# File 'lib/active_record_query_fixer.rb', line 62

def fix_order_select_distinct
  select_appends = []

  sort_targets.each do |sort_target|
    fields = sort_target.dig("SortBy", "node", "ColumnRef", "fields")
    next if !fields || fields.length != 2

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

    next if !table || !column

    select_appends << "#{table}.#{column} AS active_record_query_fixer_#{@count_select}"
    @count_select += 1
  end

  # Start by prepending a wild-card select before doing the fix-selects to avoid any issues with `DISTINCT COUNT`
  prepend_table_wildcard if !table_wildcard_prepended? && select_appends.any? && query.values[:select].blank?

  select_appends.each do |select_append|
    @query = query.select(select_append)
  end

  self
end

#fix_reference_group ⇒ Object 



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# File 'lib/active_record_query_fixer.rb', line 88

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

#fix_select_group ⇒ Object 



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# File 'lib/active_record_query_fixer.rb', line 26

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