Class: ActionBlocks::SummaryEngine

Inherits:
Object
  • Object
show all
Defined in:
lib/action_blocks/data_engine/summary_engine.rb

Overview

Data Engine

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(root_klass, user: nil, summary_reqs: []) ⇒ SummaryEngine

Returns a new instance of SummaryEngine.



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# File 'lib/action_blocks/data_engine/summary_engine.rb', line 6

def initialize(root_klass, user: nil, summary_reqs: [])
  @root_klass = root_klass
  @tables = {}

  @user = user

  @selects = []

  @summary_reqs = summary_reqs
end

Instance Attribute Details

#joins ⇒ Object

Returns the value of attribute joins.



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# File 'lib/action_blocks/data_engine/summary_engine.rb', line 4

def joins
  @joins
end

#root_klass ⇒ Object

Returns the value of attribute root_klass.



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# File 'lib/action_blocks/data_engine/summary_engine.rb', line 4

def root_klass
  @root_klass
end

#selects ⇒ Object

Returns the value of attribute selects.



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# File 'lib/action_blocks/data_engine/summary_engine.rb', line 4

def selects
  @selects
end

#summary_reqs ⇒ Object

Returns the value of attribute summary_reqs.



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# File 'lib/action_blocks/data_engine/summary_engine.rb', line 4

def summary_reqs
  @summary_reqs
end

#tables ⇒ Object

Returns the value of attribute tables.



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# File 'lib/action_blocks/data_engine/summary_engine.rb', line 4

def tables
  @tables
end

Instance Method Details

#process ⇒ Object 



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# File 'lib/action_blocks/data_engine/summary_engine.rb', line 17

def process
  root_table = @root_klass.arel_table.alias(@root_klass.to_s.underscore.pluralize)
  sub_table = @root_klass.arel_table.alias(['sub', @root_klass.to_s.underscore.pluralize].join('_'))

  @summary_reqs.each do |summaryreq|
    select_reqs = [summaryreq[:select_req]]
    match_reqs = summaryreq[:match_reqs]
    filter_reqs = summaryreq[:filter_reqs]

    @fields_engine = ActionBlocks.config[:fields_engine].new(
      summaryreq[:root_klass],
      table_alias_prefix: 'sub',
      select_reqs: select_reqs
    )

    # @selections_engine = SelectionsViaJoinsEngine.new(
    @selections_engine = ActionBlocks.config[:selections_engine].new(
      summaryreq[:root_klass],
      table_alias_prefix: 'sub',
      selection_match_reqs: match_reqs,
      selection_filter_reqs: filter_reqs,
      additional_where: root_table[:id].eq(sub_table[:id])
    )

    @fields_engine.process
    @selections_engine.process

    if ActionBlocks.config[:should_authorize]
      @authorization_adapter = AuthorizationAdapter.new(engine: @fields_engine, user: @user)
      @authorization_adapter.process
    end

    sub_query = summaryreq[:root_klass]
                .from([
                  @fields_engine.froms,
                  @selections_engine.froms,
                ].flatten.uniq)
                .select(@fields_engine.selects)
                .joins([
                  @selections_engine.ordered_joins,
                  @fields_engine.ordered_joins
                ].flatten.compact)
                .where([@selections_engine.wheres, @fields_engine.wheres].flatten.compact.reduce(&:and))
                .as(summaryreq[:select_req][:field_name].to_s)

    @selects << sub_query
  end

end

#query ⇒ Object 



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# File 'lib/action_blocks/data_engine/summary_engine.rb', line 67

def query
  @root_klass
    .select(@selects)
end