Add with_image_config for Gemini image generation #579
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Add support for Gemini's imageConfig parameter in chat-based image
generation. This allows users to specify aspect_ratio and image_size
when using models like gemini-3-pro-image-preview.
Usage:
chat = RubyLLM.chat(model: "gemini-3-pro-image-preview")
.with_temperature(1.0)
.with_image_config(aspect_ratio: "16:9", image_size: "2K")
The implementation uses the existing params deep merge mechanism,
requiring no changes to the provider interface. Snake_case parameters
are converted to camelCase for the API (aspect_ratio -> aspectRatio).
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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Summary
with_image_config(aspect_ratio:, image_size:)method toChatclass for Gemini's native image generation modelsaspectRatiovalues: "1:1", "2:3", "3:2", "3:4", "4:3", "4:5", "5:4", "9:16", "16:9", "21:9"imageSizevalues: "1K", "2K", "4K"Usage
Implementation
Uses the existing
paramsdeep merge mechanism—no changes to the provider interface required. Snake_case parameters (aspect_ratio) are converted to camelCase (aspectRatio) for the Gemini API.Test plan
#with_image_configmethod chainingeffective_paramsmerging behaviorimageConfig🤖 Generated with Claude Code