feat: implement show action

app/controllers/api/v1/contract_transactions_controller.rb

@@ -1,8 +1,22 @@
 module Api
   module V1
     class ContractTransactionsController < ApplicationController
+      before_action :validate_pagination_params, :pagination_params
+
       def show
-        render json: {}
+        raise Api::V1::Exceptions::ContractNotFoundError if params[:id] != "dao"
+        dao_contract = DaoContract.default_contract
+        ckb_transactions = dao_contract.ckb_transactions.distinct.recent.page(@page).per(@page_size)
+        options = FastJsonapi::PaginationMetaGenerator.new(request: request, records: ckb_transactions, page: @page, page_size: @page_size).call
+
+        render json: CkbTransactionSerializer.new(ckb_transactions, options.merge({ params: { previews: true } }))
+      end
+
+      private
+
+      def pagination_params
+        @page = params[:page] || 1
+        @page_size = params[:page_size] || CkbTransaction.default_per_page
       end
     end
   end

app/models/dao_contract.rb

@@ -4,6 +4,11 @@ class DaoContract < ApplicationRecord
   def self.default_contract
     find_or_create_by(id: 1)
   end
+
+  def ckb_transactions
+    ckb_transaction_ids = CellOutput.dao.select("ckb_transaction_id")
+    CkbTransaction.where(id: ckb_transaction_ids)
+  end
 end
 
 # == Schema Information