# MOI: Re-evaluate custom bridge & \`direct\_model(...)\` bridging

**URL:** <https://discourse.julialang.org/t/moi-re-evaluate-custom-bridge-direct-model-bridging/94219>\
**Category:** Optimization (Mathematical)\
**Created:** [February 7, 2023, 3:38pm UTC](https://discourse.julialang.org/t/moi-re-evaluate-custom-bridge-direct-model-bridging/94219 "2023-02-07T15:38:20Z")\
**Posts on this page:** 1\
**Showing post:** 8

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**Author:** ![odow](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/odow/32/28685_2.png) [@odow](https://discourse.julialang.org/u/odow)\
**Post date:** [February 7, 2023, 11:26pm UTC](https://discourse.julialang.org/t/moi-re-evaluate-custom-bridge-direct-model-bridging/94219/8 "2023-02-07T23:26:29Z")

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Ah. I’ve just put your two questions together: [JuMP: Multiplicative parameters for LP](https://discourse.julialang.org/t/jump-multiplicative-parameters-for-lp/94192)

Yes, that’s an elegant way to go about it: for solvers not supporting quadratics, add a bridge from quadratic to linear that checks for fixed variables in `final_touch` 😄

Open an issue or a PR at MathOptInterface.jl if you get stuck and I can point you in the right direction.

@blegat and @joaquimg will be interested/impressed.

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_[View the full topic](https://discourse.julialang.org/t/moi-re-evaluate-custom-bridge-direct-model-bridging/94219)._