Integrating Field Annotations into Protobuf Definitions
Developers seeking to utilize field annotations provided by GORM within their protobuf definitions may encounter challenges due to the absence of a native datetime type in Protobuf 3 syntax.
To address this, a post-processing script can be employed to augment the generated proto files with the desired GORM annotations. For example, given the following protobuf profile definition:
<code class="protobuf">message Profile { uint64 id = 1; string name = 2; bool active = 3; }</code>
The following script ("gorm.sh") can be used for post-processing:
<code class="bash">#!/bin/bash g () { sed "s/json:\",omitempty\"/json:\",omitempty\" gorm:\"\"/" } cat \ | g "id" "primary_key" \ | g "name" "varchar(100)" \ > .tmp && mv {.tmp,}</code>
By invoking the script on the generated protobuf file (e.g., ./gorm.sh profile/profile.pb.go), the resulting output will be:
<code class="protobuf">//... type Profile struct { state protoimpl.MessageState sizeCache protoimpl.SizeCache unknownFields protoimpl.UnknownFields Id uint64 `protobuf:"varint,1,opt,name=id,proto3" json:"id,omitempty" gorm:"type:primary_key"` Name string `protobuf:"bytes,2,opt,name=name,proto3" json:"name,omitempty" gorm:"type:varchar(100)"` Active bool `protobuf:"varint,3,opt,name=active,proto3" json:"active,omitempty"` } //...</code>
This approach enables the integration of GORM field annotations into protobuf definitions without the need for custom implementations or third-party libraries.
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