Event handler not firing on Plotly Bar Chart

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Summary The core issue is a mismatch between frontend event handling and backend event propagation. Reflex’s rx.plotly component does not automatically forward raw Plotly click events to a Python backend @rx.event handler. Plotly generates events on the client side (JavaScript), but Reflex’s on_click prop expects specific framework-controlled events. The fig.update_layout(clickmode=”event+select”) configuration correctly enables Plotly’s native … Read more

RAM + SWAP full for pyrefly

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Summary The issue at hand is related to memory management in a system running Ubuntu, where the RAM and SWAP space become fully utilized when working with a specific project, particularly when using pyrefly. This results in significant performance degradation and necessitates terminating the pyrefly process to regain system stability. Root Cause The root cause … Read more

Include in ansible.cfg an entire directory as inventory path

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Summary A senior engineer diagnosed an Ansible inventory parsing failure when moving from a shell-expanded command-line path (-i /Users/myuser/inventory/*.ini) to a static ansible.cfg configuration. The root cause was using a shell glob pattern (*.ini) inside the configuration file, which Ansible interprets literally rather than expanding. The fix is to use the directory path instead of … Read more

Include in ansible.cfg an entire directory as inventory path

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Summary A senior engineer diagnosed an Ansible inventory parsing failure when moving from a shell-expanded command-line path (-i /Users/myuser/inventory/*.ini) to a static ansible.cfg configuration. The root cause was using a shell glob pattern (*.ini) inside the configuration file, which Ansible interprets literally rather than expanding. The fix is to use the directory path instead of … Read more

Route admin and user for Marketplace Website

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Summary A student developer building a Laravel marketplace website asked how to properly route requests for Admin and User roles and noticed their lecturer flagged the default User model as incorrect. The core issue is implementing Role-Based Access Control (RBAC) on top of Laravel’s default authentication scaffolding. The lecturer’s critique of the User model likely … Read more

How to build a hallucination-free chatbot over a complex SaaS database (NL → SQL) that strictly follows business rules?

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Summary Building a hallucination-free Natural Language to SQL (NL2SQL) chatbot in a complex SaaS environment requires treating the Large Language Model (LLM) strictly as a routing and translation engine, not a decision-maker. The production-grade approach involves an intent-centric architecture where the backend exposes strictly defined “capabilities” or “query templates,” and the LLM’s role is limited … Read more

How to integrate PraxiLabs Virtual Lab simulations into a custom LMS via LTI or API?

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Summary This postmortem analyzes the integration of third-party interactive virtual lab simulations (specifically PraxiLabs) into a custom Learning Management System (LMS). The core challenge involves establishing a seamless, data-rich connection that feels like a native feature to the user. The integration requires bridging the gap between the LMS and the simulation provider using standard protocols … Read more

Struggling to conceptualize Look At Matrix

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Summary In 3D graphics, we typically move the world to the camera, not the camera to the world. The glm::lookAt function constructs a view matrix that transforms vertices from world space to camera space. To achieve this, the matrix must perform the inverse translation and rotation of the camera’s actual orientation. The confusion arises because … Read more

jitsi meet self hosted video is disabled to save bandwidth

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Summary The issue described is not a bandwidth or CPU resource constraint, but rather a network transport failure causing UDP packet loss. The Jitsi Meet system interprets 4–18% packet loss as a degraded connection and proactively disables video streams to preserve the audio channel and session stability. The root cause lies in the VPS network … Read more