FieldTypes issue related to Ad Account Delivery Estimate

[ssankim]

When I request delivery_estimate from edges of ad_account, it raised TypeError. estimate_dau and estimate_mau in Ad Account Delivery Estimate defined as object like below, but both fields returned as integer from API.

https://github.com/facebook/facebook-ruby-ads-sdk/blob/b704d31bb0a94596078e05cb08fbe4d17732c7d1/lib/facebook_ads/ad_objects/ad_account_delivery_estimate.rb#L54
https://github.com/facebook/facebook-ruby-ads-sdk/blob/b704d31bb0a94596078e05cb08fbe4d17732c7d1/lib/facebook_ads/ad_objects/ad_account_delivery_estimate.rb#L55

Other types (like string_type or list) has several ways to handling if inputted different type of value what you expected are inputted. but object type is not, it's always trying parse JSON. bid_estimate defined as object, and it occurred TypeError too. because bid_estimate already has Hash at this point, not JSON string.

I tried like below...

ad_account = FacebookAds::AdAccount.get(<AD_ACCOUNT_ID>, <SESSION>)
ad_account.delivery_estimate(<REQUIRED_PARAMS>).first

# TypeError: no implicit conversion of Hash into String
# from /Users/san/.rvm/gems/ruby-2.3.4/gems/json-1.8.6/lib/json/common.rb:155:in `initialize'

[stale]

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[stale]

Closing this issue after a prolonged period of inactivity. If this issue is still present in the latest release, please feel free to create a new issue with up-to-date information.