Module: Zermelo::Filter

Extended by:
ActiveSupport::Concern
Included in:
Zermelo::Filters::InfluxDB, Zermelo::Filters::Redis
Defined in:
lib/zermelo/filter.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#backend ⇒ Object (readonly)

Returns the value of attribute backend.



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# File 'lib/zermelo/filter.rb', line 16

def backend
  @backend
end

#steps ⇒ Object (readonly)

Returns the value of attribute steps.



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# File 'lib/zermelo/filter.rb', line 16

def steps
  @steps
end

Instance Method Details

#all ⇒ Object 



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# File 'lib/zermelo/filter.rb', line 125

def all
  lock { _all }
end

#associated_ids_for(name, options = {}) ⇒ Object 



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# File 'lib/zermelo/filter.rb', line 153

def associated_ids_for(name, options = {})
  data_type, type_klass = @associated_class.send(:with_association_data, name.to_sym) do |data|
    [data.data_type, data.type_klass]
  end

  lock {
    case data_type
    when :belongs_to, :has_one
      type_klass.send(:associated_ids_for, @backend, data_type,
        @associated_class, name,
        options[:inversed].is_a?(TrueClass), *_ids)
    else
      type_klass.send(:associated_ids_for, @backend, data_type,
        @associated_class, name, *_ids)
    end
  }
end

#associations_for(name) ⇒ Object 



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# File 'lib/zermelo/filter.rb', line 171

def associations_for(name)
  data_type = @associated_class.send(:with_association_data, name.to_sym) do |data|
    data.data_type
  end

  lock {
    case data_type
    when :belongs_to, :has_one
      raise "'associations_for' only supports multiple associations"
    else
      _ids.each_with_object({}) do |this_id, memo|
        memo[this_id] = ::Zermelo::Associations::Multiple.new(data_type,
          @associated_class, this_id, name)
      end
    end
  }
end

#collect(&block) ⇒ Object Also known as: map 



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# File 'lib/zermelo/filter.rb', line 129

def collect(&block)
  lock { _ids.collect {|id| block.call(_load(id))} }
end

#count ⇒ Object 



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# File 'lib/zermelo/filter.rb', line 117

def count
  lock(false) { _count }
end

#destroy_all ⇒ Object 



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# File 'lib/zermelo/filter.rb', line 147

def destroy_all
  lock(*@associated_class.send(:associated_classes)) do
    _all.each {|r| r.destroy }
  end
end

#diff(attrs = {}) ⇒ Object 



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# File 'lib/zermelo/filter.rb', line 48

def diff(attrs = {})
  self.class.new(@backend, @initial_key, @associated_class,
    @callback_target_class, @callback_target_id, @callbacks, @sort_order,
    self, ::Zermelo::Filters::Steps::SetStep.new({:op => :diff}, attrs))
end

#each(&block) ⇒ Object 



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# File 'lib/zermelo/filter.rb', line 134

def each(&block)
  lock { _ids.each {|id| block.call(_load(id)) } }
end

#empty ⇒ Object 



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# File 'lib/zermelo/filter.rb', line 80

def empty
  self.class.new(@backend, @initial_key, @associated_class,
    @callback_target_class, @callback_target_id, @callbacks, @sort_order,
    self, ::Zermelo::Filters::Steps::EmptyStep.new({}, {}))
end

#empty? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/zermelo/filter.rb', line 121

def empty?
  lock(false) { _count == 0 }
end

#exists?(e_id) ⇒ Boolean

step users

Returns:

  • (Boolean) 


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# File 'lib/zermelo/filter.rb', line 87

def exists?(e_id)
  lock(false) { _exists?(e_id) }
end

#find_by_id(f_id) ⇒ Object 



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# File 'lib/zermelo/filter.rb', line 91

def find_by_id(f_id)
  lock { _find_by_id(f_id) }
end

#find_by_id!(f_id) ⇒ Object

Raises:



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# File 'lib/zermelo/filter.rb', line 95

def find_by_id!(f_id)
  ret = find_by_id(f_id)
  raise ::Zermelo::Records::Errors::RecordNotFound.new(@associated_class, f_id) if ret.nil?
  ret
end

#find_by_ids(*f_ids) ⇒ Object 



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# File 'lib/zermelo/filter.rb', line 101

def find_by_ids(*f_ids)
  lock { f_ids.collect {|f_id| _find_by_id(f_id) } }
end

#find_by_ids!(*f_ids) ⇒ Object 



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# File 'lib/zermelo/filter.rb', line 105

def find_by_ids!(*f_ids)
  ret = find_by_ids(*f_ids)
  if ret.any? {|r| r.nil? }
    raise ::Zermelo::Records::Errors::RecordsNotFound.new(@associated_class, f_ids - ret.compact.map(&:id))
  end
  ret
end

#ids ⇒ Object 



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# File 'lib/zermelo/filter.rb', line 113

def ids
  lock(false) { _ids }
end

#initialize(data_backend, initial_key, associated_class, callback_target_class = nil, callback_target_id = nil, callbacks = nil, sort_order = nil, ancestor = nil, step = nil) ⇒ Object

initial set a Zermelo::Record::Key object associated_class the class of the result record TODO hash for these params as it’s getting too long



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# File 'lib/zermelo/filter.rb', line 21

def initialize(data_backend, initial_key, associated_class,
               callback_target_class = nil, callback_target_id = nil,
               callbacks = nil, sort_order = nil,
               ancestor = nil, step = nil)
  @backend          = data_backend
  @initial_key      = initial_key
  @associated_class = associated_class
  @callback_target_class  = callback_target_class
  @callback_target_id = callback_target_id
  @callbacks        = callbacks
  @sort_order       = sort_order
  @steps            = ancestor.nil? ? [] : ancestor.steps.dup
  @steps << step unless step.nil?
end

#intersect(attrs = {}) ⇒ Object 



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# File 'lib/zermelo/filter.rb', line 36

def intersect(attrs = {})
  self.class.new(@backend, @initial_key, @associated_class,
    @callback_target_class, @callback_target_id, @callbacks, @sort_order,
    self, ::Zermelo::Filters::Steps::SetStep.new({:op => :intersect}, attrs))
end

#offset(amount, opts = {}) ⇒ Object 



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# File 'lib/zermelo/filter.rb', line 63

def offset(amount, opts = {})
  self.class.new(@backend, @initial_key, @associated_class,
    @callback_target_class, @callback_target_id, @callbacks, @sort_order,
    self, ::Zermelo::Filters::Steps::ListStep.new({:offset => amount,
      :limit => opts[:limit]}, {}))
end

#page(num, opts = {}) ⇒ Object

(a different syntax to the above)



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# File 'lib/zermelo/filter.rb', line 71

def page(num, opts = {})
  per_page = opts[:per_page].to_i || 20
  start  = per_page * (num - 1)
  self.class.new(@backend, @initial_key, @associated_class,
    @callback_target_class, @callback_target_id, @callbacks, @sort_order,
    self, ::Zermelo::Filters::Steps::ListStep.new({:offset => start,
      :limit => per_page}, {}))
end

#reject(&block) ⇒ Object 



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# File 'lib/zermelo/filter.rb', line 143

def reject(&block)
  lock { _all.reject {|obj| block.call(obj)} }
end

#select(&block) ⇒ Object Also known as: find_all 



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# File 'lib/zermelo/filter.rb', line 138

def select(&block)
  lock { _all.select {|obj| block.call(obj) } }
end

#sort(keys, opts = {}) ⇒ Object 



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# File 'lib/zermelo/filter.rb', line 54

def sort(keys, opts = {})
  self.class.new(@backend, @initial_key, @associated_class,
    @callback_target_class, @callback_target_id, @callbacks, @sort_order,
    self, ::Zermelo::Filters::Steps::SortStep.new({:keys => keys,
      :desc => opts[:desc], :limit => opts[:limit],
      :offset => opts[:offset]}, {})
    )
end

#union(attrs = {}) ⇒ Object 



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# File 'lib/zermelo/filter.rb', line 42

def union(attrs = {})
  self.class.new(@backend, @initial_key, @associated_class,
    @callback_target_class, @callback_target_id, @callbacks, @sort_order,
    self, ::Zermelo::Filters::Steps::SetStep.new({:op => :union}, attrs))
end