Class: Datasource::Base

Inherits:
Object
  • Object
show all
Defined in:
lib/datasource/base.rb,
lib/datasource/attributes/query_attribute.rb,
lib/datasource/attributes/computed_attribute.rb

Class Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(scope) ⇒ Base

Returns a new instance of Base.



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# File 'lib/datasource/base.rb', line 26

def initialize(scope)
  @scope = scope
  @expose_attributes = []
  @datasource_data = {}
end

Class Attribute Details

._associations ⇒ Object

Returns the value of attribute _associations.



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# File 'lib/datasource/base.rb', line 4

def _associations
  @_associations
end

._attributes ⇒ Object

Returns the value of attribute _attributes.



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# File 'lib/datasource/base.rb', line 4

def _attributes
  @_attributes
end

._virtual_attributes ⇒ Object

Returns the value of attribute _virtual_attributes.



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# File 'lib/datasource/base.rb', line 4

def _virtual_attributes
  @_virtual_attributes
end

.adapter ⇒ Object

Returns the value of attribute adapter.



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# File 'lib/datasource/base.rb', line 5

def adapter
  @adapter
end

Class Method Details

.attribute(name, klass = nil) ⇒ Object 



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# File 'lib/datasource/base.rb', line 17

def attribute(name, klass = nil)
  @_attributes.push name: name.to_s, klass: klass
end

.attributes(*attrs) ⇒ Object 



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# File 'lib/datasource/base.rb', line 13

def attributes(*attrs)
  attrs.each { |name| attribute(name) }
end

.computed_attribute(name, deps, &block) ⇒ Object 



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# File 'lib/datasource/attributes/computed_attribute.rb', line 32

def self.computed_attribute(name, deps, &block)
  klass = Class.new(Attributes::ComputedAttribute) do
    depends deps

    define_method(:value, &block)
  end
  attribute name, klass
end

.includes_many(name, klass, foreign_key) ⇒ Object 



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# File 'lib/datasource/base.rb', line 21

def includes_many(name, klass, foreign_key)
  @_attributes.push name: name.to_s, klass: klass, foreign_key: foreign_key.to_s, id_key: self::ID_KEY
end

.inherited(base) ⇒ Object 



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# File 'lib/datasource/base.rb', line 7

def inherited(base)
  base._attributes = (_attributes || []).dup
  @adapter ||= Datasource::Adapters::ActiveRecord
  self.send :include, @adapter
end

.query_attribute(name, deps, &block) ⇒ Object 



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# File 'lib/datasource/attributes/query_attribute.rb', line 19

def self.query_attribute(name, deps, &block)
  klass = Class.new(Attributes::QueryAttribute) do
    depends deps

    define_method(:select_value, &block)
  end
  attribute name, klass
end

Instance Method Details

#attribute_exposed?(name) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/datasource/base.rb', line 48

def attribute_exposed?(name)
  @expose_attributes.include?(name)
end

#results ⇒ Object 



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# File 'lib/datasource/base.rb', line 56

def results
  rows = get_rows(@scope)

  attribute_map = self.class._attributes.inject({}) do |hash, att|
    hash[att[:name]] = att
    hash
  end

  computed_expose_attributes = []
  datasources = {}

  @expose_attributes.each do |name|
    att = attribute_map[name]
    klass = att[:klass]
    next unless klass

    if klass.ancestors.include?(Attributes::ComputedAttribute)
      computed_expose_attributes.push(att)
    elsif klass.ancestors.include?(Base)
      datasources[att] =
        included_datasource_rows(att, @datasource_data[att[:name]], rows)
    end
  end

  # TODO: field names...
  rows.each do |row|
    computed_expose_attributes.each do |att|
      klass = att[:klass]
      if klass
        row[att[:name]] = klass.new(row).value
      end
    end
    datasources.each_pair do |att, rows|
      row[att[:name]] = Array(rows[row[att[:id_key]]])
    end
    row.delete_if do |key, value|
      !attribute_exposed?(key)
    end
  end

  rows
end

#select(*names) ⇒ Object 



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# File 'lib/datasource/base.rb', line 32

def select(*names)
  names = names.flat_map do |name|
    if name.kind_of?(Hash)
      # datasource data
      name.each_pair do |k, v|
        @datasource_data[k.to_s] = v
      end
      name.keys
    else
      name
    end
  end
  @expose_attributes = (@expose_attributes + names.map(&:to_s)).uniq
  self
end

#to_query ⇒ Object 



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# File 'lib/datasource/base.rb', line 52

def to_query
  to_query(@scope)
end