Class: CardDB::Batch

Inherits:
Object
  • Object
show all
Defined in:
lib/carddb/batch.rb

Overview

Batch query builder for combining multiple queries into a single request.

Examples:

results = CardDB.batch do |b|
  b.games.fetch("uuid-1")
  b.games.fetch("uuid-2")
  b.publishers.fetch(slug: "pokemon-company")
end

results[0]  # => Game
results[1]  # => Game
results[2]  # => Publisher

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(client) ⇒ Batch

Returns a new instance of Batch.

Parameters:

  • client (Client) —

    The client instance



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# File 'lib/carddb/batch.rb', line 21

def initialize(client)
  @client = client
  @operations = []
  @counter = 0
end

Instance Attribute Details

#operations ⇒ Array<Hash> (readonly)

Returns The queued operations.

Returns:

  • (Array<Hash>) —

    The queued operations



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# File 'lib/carddb/batch.rb', line 18

def operations
  @operations
end

Instance Method Details

#add_operation(resource:, method:, args: [], kwargs: {}) ⇒ Integer

Add an operation to the batch

Parameters:

  • resource (Symbol) —

    The resource type

  • method (Symbol) —

    The method to call

  • args (Array) (defaults to: []) —

    Method arguments

  • kwargs (Hash) (defaults to: {}) —

    Method keyword arguments

Returns:

  • (Integer) —

    The index of this operation in the results



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# File 'lib/carddb/batch.rb', line 62

def add_operation(resource:, method:, args: [], kwargs: {})
  @counter += 1
  alias_name = "op#{@counter}"

  @operations << {
    alias: alias_name,
    resource: resource,
    method: method,
    args: args,
    kwargs: kwargs
  }

  @counter - 1
end

#datasets ⇒ BatchProxy

Access the Datasets resource for batching

Returns:



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# File 'lib/carddb/batch.rb', line 44

def datasets
  BatchProxy.new(self, :datasets)
end

#execute ⇒ Array

Execute all batched operations

Returns:

  • (Array) —

    Results in the same order as operations were added



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# File 'lib/carddb/batch.rb', line 80

def execute
  return [] if @operations.empty?

  # Build combined GraphQL query
  query_parts = []
  variables = {}

  @operations.each_with_index do |op, index|
    query_part, op_vars = build_operation_query(op, index)
    query_parts << query_part
    variables.merge!(op_vars)
  end

  # Combine into single query
  var_definitions = build_variable_definitions(variables)
  combined_query = <<~GRAPHQL
    query BatchQuery#{var_definitions} {
      #{query_parts.join("\n  ")}
    }
  GRAPHQL

  # Execute the combined query
  data = @client.connection.execute(combined_query, variables)

  # Parse results
  @operations.map do |op|
    result = data[op[:alias]]
    wrap_result(result, op[:resource], op[:method])
  end
end

#games ⇒ BatchProxy

Access the Games resource for batching

Returns:



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# File 'lib/carddb/batch.rb', line 37

def games
  BatchProxy.new(self, :games)
end

#publishers ⇒ BatchProxy

Access the Publishers resource for batching

Returns:



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# File 'lib/carddb/batch.rb', line 30

def publishers
  BatchProxy.new(self, :publishers)
end

#records ⇒ BatchProxy

Access the Records resource for batching

Returns:



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# File 'lib/carddb/batch.rb', line 51

def records
  BatchProxy.new(self, :records)
end